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Problème d'interface internet - ou plutôt : Problème d'interface réseau 

Bonjour à toutes et à tous,

Et un très grand merci à tous pour votre aide.
Ce n'est que maintenant que je reviens vers vous pour apporter des réponses.
Cette fois (et au contraire d'hier) j'apporte une réponse groupée à la liste - en donnant à chacun une copie cachée à chacun. 



Contenu de /etc/udev/rules.d/70-persistent-net.rules

# This file was automatically generated by the /lib/udev/write_net_rules
# program run by the persistent-net-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single line.

# PCI device 0x8086:0x1229 (e100)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:02:b3:eb:d8:02", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0" 

# Firewire device  (nodemgr)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:11:06:00:00:00:e3:32", ATTR{type}=="24", KERNEL=="eth*", NAME="eth1" 



Commande 1 :
Il m'a _fallu_ _comprendre que, sous la console, il me fallait faire _deux_ _fois_ la commande pour que ça marche !!!... 
(Alors que bizarrement sous KDE une seule fois suffit)
Pour le premier essai sous console, je n'ai pas pu repérer ce que disaient les premières lignes (mais si vous y tenez, avec un camescope, je pourrais...), mais en tous cas, pour le reste : 

Copyright 2004-2008 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

Listening on LPF/eth0/00:02:b3:eb:d8:02
Sending on   LPF/eth0/00:02:b3:eb:d8:02
Sending on   Socket/fallback
DHCPRELEASE on eth0 to 192.168.1.254 port 67
send_packet: Network is unreachable
send_packet: please consult README file regarding braodcast address
Internet Systems Consortium DHCP Client V3.1.1
Copyright 2004-2008 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

Listening on LPF/eth0/00:02:b3:eb:d8:02
Sending on   LPF/eth0/00:02:b3:eb:d8:02
Sending on   Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 6
DHCPOFFER from 192.168.1.254
DHCPREQUEST on eth0 to 255.255.255.255 port 67
DHCPACK from 192.168.1.254
bound to 192.168.1.140 -- renewal in 35124 seconds.
done.


La seconde fois, ça donnait ça :
# su invoke-rc.d networking restart
vic@box:~$ su
Mot de passe :
box:/home/vic# invoke-rc.d networking restart
Reconfiguring network interfaces...There is already a pid file /var/run/dhclient.eth0.pid with pid 3131 
killed old client process, removed PID file
Internet Systems Consortium DHCP Client V3.1.1
Copyright 2004-2008 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

Listening on LPF/eth0/00:02:b3:eb:d8:02
Sending on   LPF/eth0/00:02:b3:eb:d8:02
Sending on   Socket/fallback
DHCPRELEASE on eth0 to 192.168.1.254 port 67
Internet Systems Consortium DHCP Client V3.1.1
Copyright 2004-2008 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

Listening on LPF/eth0/00:02:b3:eb:d8:02
Sending on   LPF/eth0/00:02:b3:eb:d8:02
Sending on   Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 6
DHCPOFFER from 192.168.1.254
DHCPREQUEST on eth0 to 255.255.255.255 port 67
DHCPACK from 192.168.1.254
bound to 192.168.1.140 -- renewal in 38633 seconds.
done.
Sous KDE, ça donnait directement qqch d'exactement semblable à la deuxième mouture (si ce n'est le nombre de secondes avant "renewal"). 

Remarques supplémentaires :
1) Le module KNetworkConf (<-- Paramètres réseau <-- Centre de configuration de KDE) indique bien l'adresse IP correcte de eth0 aussitôt qu'on l'appelle. 2) Bizarrement l'applet Knetworkmanager continue d'indiquer l'interface usb0 comme sélectionnée, et pourtant j'accède à internet et tout... 3) Sous console, alors que : w3m www.debian.org ne donnait rien après une seule commande # su invoke-rc.d networking restart , après la deuxième commande, ça a tout de suite marché, Ceci est aussi vrai après avoir passé la commande une seule fois sous un terminal en mode graphique... 



Suivi de Commande 2 (une fois que tout fonctionne) :

box:/home/vic# ifconfig -a
eth0      Link encap:Ethernet  HWaddr 00:02:b3:eb:d8:02
         inet adr:192.168.1.140  Bcast:192.168.1.255  Masque:255.255.255.0
         adr inet6: fe80::202:b3ff:feeb:d802/64 Scope:Lien
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:220 errors:0 dropped:0 overruns:0 frame:0
         TX packets:682 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 lg file transmission:1000
         RX bytes:18132 (17.7 KiB)  TX bytes:735988 (718.7 KiB)

lo        Link encap:Boucle locale
         inet adr:127.0.0.1  Masque:255.0.0.0
         adr inet6: ::1/128 Scope:Hôte
         UP LOOPBACK RUNNING  MTU:16436  Metric:1
         RX packets:63 errors:0 dropped:0 overruns:0 frame:0
         TX packets:63 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 lg file transmission:0
         RX bytes:4012 (3.9 KiB)  TX bytes:4012 (3.9 KiB)

usb0      Link encap:Ethernet  HWaddr b2:05:09:80:33:74
inet adr:169.254.238.200 Bcast:169.254.255.255 Masque:255.255.0.0 
         adr inet6: fe80::b005:9ff:fe80:3374/64 Scope:Lien
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:0 errors:0 dropped:0 overruns:0 frame:0
         TX packets:1 errors:120 dropped:0 overruns:0 carrier:0
         collisions:0 lg file transmission:1000
         RX bytes:0 (0.0 B)  TX bytes:98 (98.0 B)
Je note que chaque interface a ses "huit lignes" au contraire d'auparavant (voir mon premier courriel).
Ceci est chronologiquement la dernière série de manips que j'ai faite (ce soir) - les autres datent de cet après-midi. 



Commande 3 :

vic@box:~$ nslookup
> host-server
Server:         192.168.1.254
Address:        192.168.1.254#53

** server can't find host-server: NXDOMAIN
> exit


Commande 4 :

vic@box:~$ cat /proc/interrupts
          CPU0
 0:     154079    XT-PIC-XT        timer
 1:        742    XT-PIC-XT        i8042
 2:          0    XT-PIC-XT        cascade
 3:          2    XT-PIC-XT
 4:          2    XT-PIC-XT
 5:          2    XT-PIC-XT        uhci_hcd:usb1, ohci1394
 6:          5    XT-PIC-XT        floppy
 7:          0    XT-PIC-XT        parport0
 8:          0    XT-PIC-XT        rtc0
 9:          0    XT-PIC-XT        acpi
10: 2466 XT-PIC-XT uhci_hcd:usb2, uhci_hcd:usb3, uhci_hcd:usb4, uhci_hcd:usb5, ehci_hcd:usb6, ide0, ide1, tmscsim, VIA8233 
11:       4567    XT-PIC-XT        eth0
12:      81454    XT-PIC-XT        i8042
14:      37802    XT-PIC-XT        ide2
15:      36111    XT-PIC-XT        ide3
NMI:          0   Non-maskable interrupts
LOC:          0   Local timer interrupts
RES:          0   Rescheduling interrupts
CAL:          0   function call interrupts
TLB:          0   TLB shootdowns
TRM:          0   Thermal event interrupts
SPU:          0   Spurious interrupts
ERR:          0
MIS:          0
Avec # cat /var/log/messages, ou /var/log/dmesg ou /var/log/kern.log , il y a énormément de texte... - mais même à moi qui ne suis pas un pro, il ne me semble pas qu'il y ait des infos nouvelles... Mais si vous pensez le contraire, dites-le moi - peut-être qu'avec qqch du type 
# cat /var/log/messages | grep eth0,usb0
on puisse en extraire des infos intéressantes...
D'autre part, je ne sais pas si les manips que je fais avec ifconfig (usb0 down ; eth0 down ; eth0 up) et qui _marchent_ effectivement sont elles aussi loguées dans ces fichiers ? 


A la ligne 18.413677 de /var/log/dmesg , j'ai vu ça :
usb0: register 'gl620a' at usb-0000:00:11.3-2, Genesys GeneLink, ee:67:5a:ec:ac:9e Je ne sais pas si c'est un pilote qui serait chargé "un peu tardivement"... (en tous cas le ee:67.... correspond à l'adresse de la "fausse" carte usb0) 
Alors, j'ai fait ceci :

Commande 5 :

vic@box:~$ lsmod | grep gl
gl620a                  2752  0
usbnet                 14024  1 gl620a
usbcore               118224  5 gl620a,usbnet,ehci_hcd,uhci_hcd

Quid ?...



Commande 6 :

# cat /var/log/debug    (pour aujourd'hui)
Sep 10 15:46:00 localhost kernel: [ 0.000000] Entering add_active_range(0, 0, 131056) 0 entries of 256 used Sep 10 15:46:00 localhost kernel: [ 0.000000] On node 0 totalpages: 131056 Sep 10 15:46:00 localhost kernel: [ 0.000000] DMA zone: 32 pages used for memmap Sep 10 15:46:00 localhost kernel: [ 0.000000] DMA zone: 0 pages reserved Sep 10 15:46:00 localhost kernel: [ 0.000000] DMA zone: 4064 pages, LIFO batch:0 Sep 10 15:46:00 localhost kernel: [ 0.000000] Normal zone: 992 pages used for memmap Sep 10 15:46:00 localhost kernel: [ 0.000000] Normal zone: 125968 pages, LIFO batch:31 Sep 10 15:46:00 localhost kernel: [ 0.000000] HighMem zone: 0 pages used for memmap Sep 10 15:46:00 localhost kernel: [ 0.000000] Movable zone: 0 pages used for memmap 
Sep 10 15:46:00 localhost kernel: [    0.000000] NR_CPUS: 8, nr_cpu_ids: 1
Sep 10 15:46:00 localhost kernel: [ 0.000000] mapped APIC to ffffb000 (0140d000) Sep 10 15:46:00 localhost kernel: [ 0.004000] CPA: page pool initialized 1 of 1 pages preallocated Sep 10 15:46:00 localhost kernel: [ 0.117589] CPU0 attaching sched-domain: 
Sep 10 15:46:00 localhost kernel: [    0.117593]  domain 0: span 0
Sep 10 15:46:00 localhost kernel: [    0.117596]   groups: 0
Sep 10 15:46:00 localhost kernel: [ 0.136865] ACPI: EC: Look up EC in DSDT Sep 10 15:46:00 localhost kernel: [ 0.149436] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0._PRT] Sep 10 15:46:00 localhost kernel: [ 0.188487] PCI: Setting latency timer of device 0000:00:01.0 to 64 Sep 10 15:46:00 localhost kernel: [ 0.692080] Switched to high resolution mode on CPU 0 Sep 10 15:46:00 localhost kernel: [ 0.838090] pci 0000:01:00.0: Boot video device Sep 10 15:46:00 localhost kernel: [ 1.944990] PCI: setting IRQ 5 as level-triggered Sep 10 15:46:00 localhost kernel: [ 2.048710] PCI: setting IRQ 10 as level-triggered 
Sep 10 15:46:00 localhost kernel: [    2.511578] libata version 3.00 loaded.
Sep 10 15:46:00 localhost kernel: [ 2.640430] ohci1394: fw-host0: Serial EEPROM has suspicious values, attempting to set max_packet_size to 512 bytes Sep 10 15:46:00 localhost kernel: [ 2.719085] Probing IDE interface ide0... Sep 10 15:46:00 localhost kernel: [ 8.340322] ieee1394: Host added: ID:BUS[0-00:1023] GUID[001106000000e332] Sep 10 15:46:00 localhost kernel: [ 8.696148] hda: host max PIO4 wanted PIO255(auto-tune) selected PIO3 Sep 10 15:46:00 localhost kernel: [ 8.709665] Probing IDE interface ide1... Sep 10 15:46:00 localhost kernel: [ 9.903870] PCI: setting IRQ 11 as level-triggered Sep 10 15:46:00 localhost kernel: [ 9.934228] Probing IDE interface ide2... Sep 10 15:46:00 localhost kernel: [ 10.852121] hde: host max PIO5 wanted PIO255(auto-tune) selected PIO4 Sep 10 15:46:00 localhost kernel: [ 10.852752] hdf: host max PIO5 wanted PIO255(auto-tune) selected PIO4 Sep 10 15:46:00 localhost kernel: [ 10.859678] Probing IDE interface ide3... Sep 10 15:46:00 localhost kernel: [ 12.564103] hdg: host max PIO5 wanted PIO255(auto-tune) selected PIO4 Sep 10 15:46:00 localhost kernel: [ 12.565382] hdh: host max PIO5 wanted PIO255(auto-tune) selected PIO4 Sep 10 15:46:00 localhost kernel: [ 19.347887] PCI: Setting latency timer of device 0000:00:11.5 to 64 Sep 10 15:47:20 localhost kernel: [ 108.600037] usb0: no IPv6 routers present Sep 10 15:50:36 localhost kernel: [ 304.396049] usb0: no IPv6 routers present Sep 10 15:51:01 localhost kernel: [ 329.084032] eth0: no IPv6 routers present 


Commande 7 (le plus intéressant ?)

Avec # cat /var/log/daemon    (pour aujourd'hui)
Sep 10 15:46:01 localhost avahi-daemon[2392]: Found user 'avahi' (UID 104) and group 'avahi' (GID 109). Sep 10 15:46:01 localhost avahi-daemon[2392]: Successfully dropped root privileges. Sep 10 15:46:01 localhost avahi-daemon[2392]: avahi-daemon 0.6.23 starting up. 
Sep 10 15:46:01 localhost avahi-daemon[2392]: Successfully called chroot().
Sep 10 15:46:01 localhost avahi-daemon[2392]: Successfully dropped remaining capabilities. Sep 10 15:46:01 localhost avahi-daemon[2392]: No service file found in /etc/avahi/services. Sep 10 15:46:01 localhost avahi-daemon[2392]: Joining mDNS multicast group on interface eth0.IPv6 with address fe80::202:b3ff:feeb:d802. Sep 10 15:46:01 localhost avahi-daemon[2392]: New relevant interface eth0.IPv6 for mDNS. Sep 10 15:46:01 localhost avahi-daemon[2392]: Joining mDNS multicast group on interface eth0.IPv4 with address 192.168.1.140. Sep 10 15:46:01 localhost avahi-daemon[2392]: New relevant interface eth0.IPv4 for mDNS. Sep 10 15:46:01 localhost avahi-daemon[2392]: Network interface enumeration completed. Sep 10 15:46:01 localhost avahi-daemon[2392]: Registering new address record for fe80::202:b3ff:feeb:d802 on eth0.*. Sep 10 15:46:01 localhost avahi-daemon[2392]: Registering new address record for 192.168.1.140 on eth0.IPv4. Sep 10 15:46:01 localhost avahi-daemon[2392]: Registering HINFO record with values 'I686'/'LINUX'. Sep 10 15:46:02 localhost avahi-daemon[2392]: Server startup complete. Host name is box.local. Local service cookie is 871147812. 
Sep 10 15:46:05 localhost acpid: client connected from 2820[105:112]
Sep 10 15:46:05 localhost NetworkManager: <info>  starting...
Sep 10 15:46:06 localhost NetworkManager: <info> New VPN service 'vpnc' (org.freedesktop.NetworkManager.vpnc). Sep 10 15:46:06 localhost NetworkManager: <info> New VPN service 'openvpn' (org.freedesktop.NetworkManager.openvpn). Sep 10 15:46:06 localhost NetworkManager: <info> usb0: Device is fully-supported using driver 'gl620a'. Sep 10 15:46:06 localhost NetworkManager: <info> nm_device_init(): waiting for device's worker thread to start Sep 10 15:46:06 localhost NetworkManager: <info> nm_device_init(): device's worker thread started, continuing. Sep 10 15:46:06 localhost NetworkManager: <info> Now managing wired Ethernet (802.3) device 'usb0'. 
Sep 10 15:46:06 localhost NetworkManager: <info>  Deactivating device usb0.
Sep 10 15:46:06 localhost NetworkManager: <info> Will activate wired connection 'usb0' because it now has a link. Sep 10 15:46:06 localhost NetworkManager: <info> eth0: Device is fully-supported using driver 'e100'. Sep 10 15:46:06 localhost NetworkManager: <info> nm_device_init(): waiting for device's worker thread to start Sep 10 15:46:06 localhost NetworkManager: <info> nm_device_init(): device's worker thread started, continuing. Sep 10 15:46:06 localhost NetworkManager: <info> Now managing wired Ethernet (802.3) device 'eth0'. 
Sep 10 15:46:06 localhost NetworkManager: <info>  Deactivating device eth0.
Sep 10 15:46:06 localhost avahi-daemon[2392]: Withdrawing address record for 192.168.1.140 on eth0. Sep 10 15:46:06 localhost avahi-daemon[2392]: Leaving mDNS multicast group on interface eth0.IPv4 with address 192.168.1.140. Sep 10 15:46:06 localhost avahi-daemon[2392]: Interface eth0.IPv4 no longer relevant for mDNS. Sep 10 15:46:06 localhost avahi-daemon[2392]: Withdrawing address record for fe80::202:b3ff:feeb:d802 on eth0. Sep 10 15:46:06 localhost avahi-daemon[2392]: Leaving mDNS multicast group on interface eth0.IPv6 with address fe80::202:b3ff:feeb:d802. Sep 10 15:46:06 localhost avahi-daemon[2392]: Interface eth0.IPv6 no longer relevant for mDNS. Sep 10 15:46:06 localhost NetworkManager: <info> Will activate wired connection 'eth0' because it now has a link. Sep 10 15:46:06 localhost NetworkManager: <info> SWITCH: no current connection, found better connection 'usb0'. Sep 10 15:46:06 localhost NetworkManager: <info> Will activate connection 'usb0'. Sep 10 15:46:06 localhost NetworkManager: <info> Device usb0 activation scheduled... Sep 10 15:46:06 localhost NetworkManager: <info> Activation (usb0) started... Sep 10 15:46:06 localhost NetworkManager: <info> Activation (usb0) Stage 1 of 5 (Device Prepare) scheduled... Sep 10 15:46:06 localhost NetworkManager: <info> Activation (usb0) Stage 1 of 5 (Device Prepare) started... Sep 10 15:46:06 localhost NetworkManager: <info> Activation (usb0) Stage 2 of 5 (Device Configure) scheduled... Sep 10 15:46:06 localhost NetworkManager: <info> Activation (usb0) Stage 1 of 5 (Device Prepare) complete. Sep 10 15:46:06 localhost NetworkManager: <info> Activation (usb0) Stage 2 of 5 (Device Configure) starting... Sep 10 15:46:06 localhost NetworkManager: <info> Activation (usb0) Stage 2 of 5 (Device Configure) successful. Sep 10 15:46:06 localhost NetworkManager: <info> Activation (usb0) Stage 3 of 5 (IP Configure Start) scheduled. Sep 10 15:46:06 localhost NetworkManager: <info> Activation (usb0) Stage 2 of 5 (Device Configure) complete. Sep 10 15:46:06 localhost NetworkManager: <info> Activation (usb0) Stage 3 of 5 (IP Configure Start) started... 
Sep 10 15:46:07 localhost acpid: client connected from 2954[0:0]
Sep 10 15:46:07 localhost NetworkManager: <info> Activation (usb0) Beginning DHCP transaction. Sep 10 15:46:07 localhost NetworkManager: <info> DHCP daemon state is now 12 (successfully started) for interface usb0 Sep 10 15:46:07 localhost NetworkManager: <info> Activation (usb0) Stage 3 of 5 (IP Configure Start) complete. Sep 10 15:46:08 localhost NetworkManager: <info> DHCP daemon state is now 1 (starting) for interface usb0 Sep 10 15:46:09 localhost dhclient: DHCPDISCOVER on usb0 to 255.255.255.255 port 67 interval 8 Sep 10 15:46:17 localhost dhclient: DHCPDISCOVER on usb0 to 255.255.255.255 port 67 interval 19 Sep 10 15:46:36 localhost dhclient: DHCPDISCOVER on usb0 to 255.255.255.255 port 67 interval 7 Sep 10 15:46:43 localhost dhclient: DHCPDISCOVER on usb0 to 255.255.255.255 port 67 interval 15 Sep 10 15:46:52 localhost NetworkManager: <info> Device 'usb0' DHCP transaction took too long (>45s), stopping it. Sep 10 15:46:52 localhost dhclient: There is already a pid file /var/run/dhclient.usb0.pid with pid 2986 Sep 10 15:46:52 localhost dhclient: killed old client process, removed PID file Sep 10 15:46:53 localhost NetworkManager: <info> Activation (usb0) Stage 4 of 5 (IP Configure Timeout) started... Sep 10 15:46:53 localhost NetworkManager: <info> No DHCP reply received. Automatically obtaining IP via Zeroconf. Sep 10 15:46:53 localhost NetworkManager: <info> Activation (usb0) Stage 4 of 5 (IP Configure Timeout) scheduled... Sep 10 15:46:53 localhost NetworkManager: <info> DHCP daemon state is now 14 (normal exit) for interface usb0 Sep 10 15:46:53 localhost NetworkManager: <info> DHCP daemon state is now 14 (normal exit) for interface usb0 Sep 10 15:46:53 localhost NetworkManager: <info> autoip: Sending probe #0 for IP address 169.254.228.69. Sep 10 15:46:53 localhost NetworkManager: <info> autoip: Waiting for reply... Sep 10 15:46:55 localhost NetworkManager: <info> autoip: Sending probe #1 for IP address 169.254.228.69. Sep 10 15:46:55 localhost NetworkManager: <info> autoip: Waiting for reply... Sep 10 15:46:57 localhost NetworkManager: <info> autoip: Sending probe #2 for IP address 169.254.228.69. Sep 10 15:46:57 localhost NetworkManager: <info> autoip: Waiting for reply... Sep 10 15:47:00 localhost NetworkManager: <info> autoip: Sending announce #0 for IP address 169.254.228.69. Sep 10 15:47:00 localhost NetworkManager: <info> autoip: Waiting for reply... Sep 10 15:47:03 localhost NetworkManager: <info> autoip: Sending announce #1 for IP address 169.254.228.69. Sep 10 15:47:03 localhost NetworkManager: <info> autoip: Waiting for reply... Sep 10 15:47:06 localhost NetworkManager: <info> autoip: Sending announce #2 for IP address 169.254.228.69. Sep 10 15:47:06 localhost NetworkManager: <info> autoip: Waiting for reply... Sep 10 15:47:09 localhost NetworkManager: <info> Activation (usb0) Stage 5 of 5 (IP Configure Commit) scheduled... Sep 10 15:47:09 localhost NetworkManager: <info> Activation (usb0) Stage 4 of 5 (IP Configure Timeout) complete. Sep 10 15:47:09 localhost NetworkManager: <info> Activation (usb0) Stage 5 of 5 (IP Configure Commit) started... Sep 10 15:47:09 localhost avahi-daemon[2392]: Joining mDNS multicast group on interface usb0.IPv4 with address 169.254.228.69. Sep 10 15:47:09 localhost avahi-daemon[2392]: New relevant interface usb0.IPv4 for mDNS. Sep 10 15:47:09 localhost avahi-daemon[2392]: Registering new address record for 169.254.228.69 on usb0.IPv4. Sep 10 15:47:10 localhost NetworkManager: <info> DHCP returned name servers but system has disabled dynamic modification! Sep 10 15:47:10 localhost NetworkManager: <info> Activation (usb0) successful, device activated. Sep 10 15:47:10 localhost NetworkManager: <info> Activation (usb0) Finish handler scheduled. Sep 10 15:47:10 localhost NetworkManager: <info> Activation (usb0) Stage 5 of 5 (IP Configure Commit) complete. Sep 10 15:47:11 localhost avahi-daemon[2392]: Joining mDNS multicast group on interface usb0.IPv6 with address fe80::ec67:5aff:feec:ac9e. Sep 10 15:47:11 localhost avahi-daemon[2392]: New relevant interface usb0.IPv6 for mDNS. Sep 10 15:47:11 localhost avahi-daemon[2392]: Registering new address record for fe80::ec67:5aff:feec:ac9e on usb0.*. Sep 10 15:49:22 localhost NetworkManager: <info> User request to disable wireless. Sep 10 15:49:22 localhost NetworkManager: <info> Updating allowed wireless network lists. Sep 10 15:49:22 localhost NetworkManager: <WARN> nm_dbus_get_networks_cb(): error received: org.freedesktop.NetworkManagerInfo.NoNetworks - org.freedesktop.NetworkManagerInfo.NoNetworks. Sep 10 15:49:51 localhost dhclient: receive_packet failed on eth0: Network is down Sep 10 15:50:02 localhost avahi-daemon[2392]: Interface usb0.IPv6 no longer relevant for mDNS. Sep 10 15:50:02 localhost avahi-daemon[2392]: Leaving mDNS multicast group on interface usb0.IPv6 with address fe80::ec67:5aff:feec:ac9e. Sep 10 15:50:02 localhost avahi-daemon[2392]: Interface usb0.IPv4 no longer relevant for mDNS. Sep 10 15:50:02 localhost avahi-daemon[2392]: Leaving mDNS multicast group on interface usb0.IPv4 with address 169.254.228.69. Sep 10 15:50:02 localhost avahi-daemon[2392]: Withdrawing address record for fe80::ec67:5aff:feec:ac9e on usb0. Sep 10 15:50:02 localhost avahi-daemon[2392]: Withdrawing address record for 169.254.228.69 on usb0. Sep 10 15:50:02 localhost NetworkManager: <info> SWITCH: terminating current connection 'usb0' because it's no longer valid. 
Sep 10 15:50:02 localhost NetworkManager: <info>  Deactivating device usb0.
Sep 10 15:50:02 localhost NetworkManager: nm_device_is_802_3_ethernet: assertion `dev != NULL' failed Sep 10 15:50:02 localhost NetworkManager: nm_device_is_802_11_wireless: assertion `dev != NULL' failed Sep 10 15:50:13 localhost NetworkManager: <info> Will activate wired connection 'usb0' because it now has a link. Sep 10 15:50:13 localhost NetworkManager: <info> SWITCH: no current connection, found better connection 'usb0'. Sep 10 15:50:13 localhost NetworkManager: <info> Will activate connection 'usb0'. Sep 10 15:50:13 localhost NetworkManager: <info> Device usb0 activation scheduled... Sep 10 15:50:13 localhost NetworkManager: <info> Activation (usb0) started... Sep 10 15:50:13 localhost NetworkManager: <info> Activation (usb0) Stage 1 of 5 (Device Prepare) scheduled... Sep 10 15:50:13 localhost NetworkManager: <info> Activation (usb0) Stage 1 of 5 (Device Prepare) started... Sep 10 15:50:13 localhost NetworkManager: <info> Activation (usb0) Stage 2 of 5 (Device Configure) scheduled... Sep 10 15:50:13 localhost NetworkManager: <info> Activation (usb0) Stage 1 of 5 (Device Prepare) complete. Sep 10 15:50:13 localhost NetworkManager: <info> Activation (usb0) Stage 2 of 5 (Device Configure) starting... Sep 10 15:50:13 localhost NetworkManager: <info> Activation (usb0) Stage 2 of 5 (Device Configure) successful. Sep 10 15:50:13 localhost NetworkManager: <info> Activation (usb0) Stage 3 of 5 (IP Configure Start) scheduled. Sep 10 15:50:13 localhost NetworkManager: <info> Activation (usb0) Stage 2 of 5 (Device Configure) complete. Sep 10 15:50:13 localhost NetworkManager: <info> Activation (usb0) Stage 3 of 5 (IP Configure Start) started... Sep 10 15:50:15 localhost avahi-daemon[2392]: Joining mDNS multicast group on interface usb0.IPv6 with address fe80::ec67:5aff:feec:ac9e. Sep 10 15:50:15 localhost avahi-daemon[2392]: New relevant interface usb0.IPv6 for mDNS. Sep 10 15:50:15 localhost avahi-daemon[2392]: Registering new address record for fe80::ec67:5aff:feec:ac9e on usb0.*. Sep 10 15:50:15 localhost NetworkManager: <info> Activation (usb0) Beginning DHCP transaction. Sep 10 15:50:15 localhost NetworkManager: <info> DHCP daemon state is now 12 (successfully started) for interface usb0 Sep 10 15:50:15 localhost NetworkManager: <info> Activation (usb0) Stage 3 of 5 (IP Configure Start) complete. Sep 10 15:50:16 localhost NetworkManager: <info> DHCP daemon state is now 1 (starting) for interface usb0 Sep 10 15:50:19 localhost dhclient: receive_packet failed on usb0: Network is down Sep 10 15:50:19 localhost avahi-daemon[2392]: Interface usb0.IPv6 no longer relevant for mDNS. Sep 10 15:50:19 localhost avahi-daemon[2392]: Leaving mDNS multicast group on interface usb0.IPv6 with address fe80::ec67:5aff:feec:ac9e. Sep 10 15:50:19 localhost NetworkManager: <info> SWITCH: terminating current connection 'usb0' because it's no longer valid. Sep 10 15:50:19 localhost avahi-daemon[2392]: Withdrawing address record for fe80::ec67:5aff:feec:ac9e on usb0. 
Sep 10 15:50:19 localhost NetworkManager: <info>  Deactivating device usb0.
Sep 10 15:50:19 localhost NetworkManager: <info> Activation (usb0): cancelling... Sep 10 15:50:19 localhost NetworkManager: <info> Activation (usb0) cancellation handler scheduled... Sep 10 15:50:19 localhost dhclient: There is already a pid file /var/run/dhclient.usb0.pid with pid 3221 Sep 10 15:50:19 localhost dhclient: killed old client process, removed PID file Sep 10 15:50:19 localhost NetworkManager: <info> Activation (usb0): waiting for device to cancel activation. Sep 10 15:50:20 localhost NetworkManager: <info> Activation (usb0) cancellation handled. Sep 10 15:50:20 localhost NetworkManager: <info> Activation (usb0): cancelled. Sep 10 15:50:20 localhost NetworkManager: nm_device_is_802_3_ethernet: assertion `dev != NULL' failed Sep 10 15:50:20 localhost NetworkManager: nm_device_is_802_11_wireless: assertion `dev != NULL' failed Sep 10 15:50:25 localhost NetworkManager: <info> Will activate wired connection 'usb0' because it now has a link. Sep 10 15:50:25 localhost NetworkManager: <info> SWITCH: no current connection, found better connection 'usb0'. Sep 10 15:50:25 localhost NetworkManager: <info> Will activate connection 'usb0'. Sep 10 15:50:25 localhost NetworkManager: <info> Device usb0 activation scheduled... Sep 10 15:50:25 localhost NetworkManager: <info> Activation (usb0) started... Sep 10 15:50:25 localhost NetworkManager: <info> Activation (usb0) Stage 1 of 5 (Device Prepare) scheduled... Sep 10 15:50:25 localhost NetworkManager: <info> Activation (usb0) Stage 1 of 5 (Device Prepare) started... Sep 10 15:50:25 localhost NetworkManager: <info> Activation (usb0) Stage 2 of 5 (Device Configure) scheduled... Sep 10 15:50:25 localhost NetworkManager: <info> Activation (usb0) Stage 1 of 5 (Device Prepare) complete. Sep 10 15:50:25 localhost NetworkManager: <info> Activation (usb0) Stage 2 of 5 (Device Configure) starting... Sep 10 15:50:25 localhost NetworkManager: <info> Activation (usb0) Stage 2 of 5 (Device Configure) successful. Sep 10 15:50:25 localhost NetworkManager: <info> Activation (usb0) Stage 3 of 5 (IP Configure Start) scheduled. Sep 10 15:50:25 localhost NetworkManager: <info> Activation (usb0) Stage 2 of 5 (Device Configure) complete. Sep 10 15:50:25 localhost NetworkManager: <info> Activation (usb0) Stage 3 of 5 (IP Configure Start) started... Sep 10 15:50:27 localhost avahi-daemon[2392]: Joining mDNS multicast group on interface usb0.IPv6 with address fe80::ec67:5aff:feec:ac9e. Sep 10 15:50:27 localhost avahi-daemon[2392]: New relevant interface usb0.IPv6 for mDNS. Sep 10 15:50:27 localhost avahi-daemon[2392]: Registering new address record for fe80::ec67:5aff:feec:ac9e on usb0.*. Sep 10 15:50:27 localhost NetworkManager: <info> Activation (usb0) Beginning DHCP transaction. Sep 10 15:50:27 localhost NetworkManager: <info> DHCP daemon state is now 12 (successfully started) for interface usb0 Sep 10 15:50:27 localhost NetworkManager: <info> Activation (usb0) Stage 3 of 5 (IP Configure Start) complete. Sep 10 15:50:28 localhost NetworkManager: <info> DHCP daemon state is now 1 (starting) for interface usb0 Sep 10 15:50:30 localhost dhclient: DHCPDISCOVER on usb0 to 255.255.255.255 port 67 interval 3 Sep 10 15:50:33 localhost dhclient: DHCPDISCOVER on usb0 to 255.255.255.255 port 67 interval 4 Sep 10 15:50:36 localhost avahi-daemon[2392]: Interface usb0.IPv6 no longer relevant for mDNS. Sep 10 15:50:36 localhost avahi-daemon[2392]: Leaving mDNS multicast group on interface usb0.IPv6 with address fe80::ec67:5aff:feec:ac9e. Sep 10 15:50:36 localhost avahi-daemon[2392]: Withdrawing address record for fe80::ec67:5aff:feec:ac9e on usb0. Sep 10 15:50:36 localhost dhclient: receive_packet failed on usb0: Network is down Sep 10 15:50:36 localhost NetworkManager: <info> SWITCH: terminating current connection 'usb0' because it's no longer valid. 
Sep 10 15:50:36 localhost NetworkManager: <info>  Deactivating device usb0.
Sep 10 15:50:36 localhost NetworkManager: <info> Activation (usb0): cancelling... Sep 10 15:50:36 localhost NetworkManager: <info> Activation (usb0) cancellation handler scheduled... Sep 10 15:50:36 localhost NetworkManager: <info> Activation (usb0): waiting for device to cancel activation. Sep 10 15:50:36 localhost dhclient: There is already a pid file /var/run/dhclient.usb0.pid with pid 3245 Sep 10 15:50:36 localhost dhclient: killed old client process, removed PID file Sep 10 15:50:37 localhost NetworkManager: <info> Activation (usb0) cancellation handled. Sep 10 15:50:37 localhost NetworkManager: <info> Activation (usb0): cancelled. Sep 10 15:50:37 localhost NetworkManager: nm_device_is_802_3_ethernet: assertion `dev != NULL' failed Sep 10 15:50:37 localhost NetworkManager: nm_device_is_802_11_wireless: assertion `dev != NULL' failed Sep 10 15:50:43 localhost NetworkManager: <info> Will activate wired connection 'eth0' because it now has a link. Sep 10 15:50:43 localhost NetworkManager: <info> SWITCH: no current connection, found better connection 'eth0'. Sep 10 15:50:43 localhost NetworkManager: <info> Will activate connection 'eth0'. Sep 10 15:50:43 localhost NetworkManager: <info> Device eth0 activation scheduled... Sep 10 15:50:43 localhost NetworkManager: <info> Activation (eth0) started... Sep 10 15:50:43 localhost NetworkManager: <info> Activation (eth0) Stage 1 of 5 (Device Prepare) scheduled... Sep 10 15:50:43 localhost NetworkManager: <info> Activation (eth0) Stage 1 of 5 (Device Prepare) started... Sep 10 15:50:43 localhost NetworkManager: <info> Activation (eth0) Stage 2 of 5 (Device Configure) scheduled... Sep 10 15:50:43 localhost NetworkManager: <info> Activation (eth0) Stage 1 of 5 (Device Prepare) complete. Sep 10 15:50:43 localhost NetworkManager: <info> Activation (eth0) Stage 2 of 5 (Device Configure) starting... Sep 10 15:50:43 localhost NetworkManager: <info> Activation (eth0) Stage 2 of 5 (Device Configure) successful. Sep 10 15:50:43 localhost NetworkManager: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) scheduled. Sep 10 15:50:43 localhost NetworkManager: <info> Activation (eth0) Stage 2 of 5 (Device Configure) complete. Sep 10 15:50:43 localhost NetworkManager: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) started... Sep 10 15:50:44 localhost NetworkManager: <info> Activation (eth0) Beginning DHCP transaction. Sep 10 15:50:45 localhost NetworkManager: <info> DHCP daemon state is now 12 (successfully started) for interface eth0 Sep 10 15:50:45 localhost NetworkManager: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) complete. Sep 10 15:50:45 localhost avahi-daemon[2392]: Joining mDNS multicast group on interface eth0.IPv6 with address fe80::202:b3ff:feeb:d802. Sep 10 15:50:45 localhost avahi-daemon[2392]: New relevant interface eth0.IPv6 for mDNS. Sep 10 15:50:45 localhost avahi-daemon[2392]: Registering new address record for fe80::202:b3ff:feeb:d802 on eth0.*. Sep 10 15:50:46 localhost NetworkManager: <info> DHCP daemon state is now 1 (starting) for interface eth0 Sep 10 15:50:49 localhost dhclient: DHCPREQUEST on eth0 to 255.255.255.255 port 67 
Sep 10 15:50:49 localhost dhclient: DHCPACK from 192.168.1.254
Sep 10 15:50:49 localhost avahi-daemon[2392]: Joining mDNS multicast group on interface eth0.IPv4 with address 192.168.1.140. Sep 10 15:50:49 localhost avahi-daemon[2392]: New relevant interface eth0.IPv4 for mDNS. Sep 10 15:50:49 localhost avahi-daemon[2392]: Registering new address record for 192.168.1.140 on eth0.IPv4. Sep 10 15:50:49 localhost NetworkManager: <info> DHCP daemon state is now 4 (reboot) for interface eth0 Sep 10 15:50:49 localhost NetworkManager: <info> Activation (eth0) Stage 4 of 5 (IP Configure Get) scheduled... Sep 10 15:50:49 localhost NetworkManager: <info> Activation (eth0) Stage 4 of 5 (IP Configure Get) started... Sep 10 15:50:49 localhost dhclient: bound to 192.168.1.140 -- renewal in 41753 seconds. Sep 10 15:50:49 localhost NetworkManager: <info> Retrieved the following IP4 configuration from the DHCP daemon: 
Sep 10 15:50:49 localhost NetworkManager: <info>    address 192.168.1.140
Sep 10 15:50:49 localhost NetworkManager: <info>    netmask 255.255.255.0
Sep 10 15:50:49 localhost NetworkManager: <info>    broadcast 192.168.1.255
Sep 10 15:50:49 localhost NetworkManager: <info>    gateway 192.168.1.254
Sep 10 15:50:49 localhost NetworkManager: <info>    nameserver 192.168.1.254
Sep 10 15:50:49 localhost NetworkManager: <info>    domain name 'darty'
Sep 10 15:50:49 localhost NetworkManager: <info> Activation (eth0) Stage 5 of 5 (IP Configure Commit) scheduled... Sep 10 15:50:49 localhost NetworkManager: <info> Activation (eth0) Stage 4 of 5 (IP Configure Get) complete. Sep 10 15:50:49 localhost NetworkManager: <info> Activation (eth0) Stage 5 of 5 (IP Configure Commit) started... Sep 10 15:50:49 localhost avahi-daemon[2392]: Withdrawing address record for 192.168.1.140 on eth0. Sep 10 15:50:49 localhost avahi-daemon[2392]: Leaving mDNS multicast group on interface eth0.IPv4 with address 192.168.1.140. Sep 10 15:50:49 localhost avahi-daemon[2392]: Interface eth0.IPv4 no longer relevant for mDNS. Sep 10 15:50:49 localhost avahi-daemon[2392]: Withdrawing address record for fe80::202:b3ff:feeb:d802 on eth0. Sep 10 15:50:49 localhost avahi-daemon[2392]: Leaving mDNS multicast group on interface eth0.IPv6 with address fe80::202:b3ff:feeb:d802. Sep 10 15:50:49 localhost avahi-daemon[2392]: Interface eth0.IPv6 no longer relevant for mDNS. Sep 10 15:50:49 localhost avahi-daemon[2392]: Joining mDNS multicast group on interface eth0.IPv4 with address 192.168.1.140. Sep 10 15:50:49 localhost avahi-daemon[2392]: New relevant interface eth0.IPv4 for mDNS. Sep 10 15:50:49 localhost avahi-daemon[2392]: Registering new address record for 192.168.1.140 on eth0.IPv4. Sep 10 15:50:50 localhost NetworkManager: <info> DHCP returned name servers but system has disabled dynamic modification! Sep 10 15:50:50 localhost NetworkManager: <info> Activation (eth0) successful, device activated. Sep 10 15:50:50 localhost NetworkManager: <info> Activation (eth0) Finish handler scheduled. Sep 10 15:50:50 localhost NetworkManager: <info> Activation (eth0) Stage 5 of 5 (IP Configure Commit) complete. Sep 10 15:50:52 localhost avahi-daemon[2392]: Joining mDNS multicast group on interface eth0.IPv6 with address fe80::202:b3ff:feeb:d802. Sep 10 15:50:52 localhost avahi-daemon[2392]: New relevant interface eth0.IPv6 for mDNS. Sep 10 15:50:52 localhost avahi-daemon[2392]: Registering new address record for fe80::202:b3ff:feeb:d802 on eth0.*.
J'espère que vous pourrez en tirer plus d'enseignements que moi. En tous cas, le dernier log est vraiment très intéressant... Que se passe-t-il dans les 16 dernières lignes ? N'y aurait-il pas perte de temps sur eth0 qui fait qu'elle ne serait plus "à temps" "au rendez-vous" avec DHCP ? Ou avec network-manager ? Et la septième ligne en partant de la fin ??? 
Mais où et comment rectifier ?

Merci d'avance de votre aide !

Cordialement

ludo
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