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Re: Must _reboot_ to restart network

hi.
Can you try to determine a network driver vie lspci forexample? or dmesg?
After this can try to `modprobe -r DRIVERNAME && modprobe DRIVERNAME`. This is must enough for you.
You can see a /var/log/messages for thelast messages before network is down for diagnostic. 

On 05/28/2013 04:21 PM, Itay wrote:

Hi,

I started to have these problems since one of the recent upgrades.

Symptoms:
- Computer works fine for a day or so.
- Then network spontaneously disconnects.
- ifdown eth0 [1] and ifup eth0 [2] (as root) fail to restart the network. 
- Reboot solves the problem.
- All other computers on our LAN work just fine during the network downtime on that computer 

If it helps, see also [3] output of 'ifconfig -a',
taken while network is working fine.

I would appreciate any help to figure this out.

Thanks in advance,
Itay


[1]
gandalf:~# ifdown eth0
Internet Systems Consortium DHCP Client 4.1.1-P1
Copyright 2004-2010 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/eth0/00:26:18:72:71:14
Sending on   LPF/eth0/00:26:18:72:71:14
Sending on   Socket/fallback
DHCPRELEASE on eth0 to 10.0.0.138 port 67
send_packet: Network is unreachable
send_packet: please consult README file regarding broadcast address.
Reloading /etc/samba/smb.conf: smbd only.

[2]
gandalf:~# ifup eth0
Internet Systems Consortium DHCP Client 4.1.1-P1
Copyright 2004-2010 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/eth0/00:26:18:72:71:14
Sending on   LPF/eth0/00:26:18:72:71:14
Sending on   Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 7
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 13
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 21
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 12
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 2
No DHCPOFFERS received.
No working leases in persistent database - sleeping.

[3]
gandalf:~# ifconfig -a
eth0      Link encap:Ethernet  HWaddr 00:26:18:72:71:14
          inet addr:10.0.0.1  Bcast:10.0.0.255  Mask:255.255.255.0
          inet6 addr: fe80::226:18ff:fe72:7114/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:405 errors:0 dropped:0 overruns:0 frame:0
          TX packets:421 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:108436 (105.8 KiB)  TX bytes:54108 (52.8 KiB)
          Interrupt:20

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:156 errors:0 dropped:0 overruns:0 frame:0
          TX packets:156 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:9992 (9.7 KiB)  TX bytes:9992 (9.7 KiB)

pan0      Link encap:Ethernet  HWaddr e2:9f:16:0e:b6:2a
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
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