Re: Auto network reconfiguring causes DNS lookup to fail

[Joel Roth <joelz@pobox.com>]

On Sun, Nov 13, 2011 at 05:13:54PM +0000, Brian wrote:
> On Sun 13 Nov 2011 at 05:29:50 -1000, Joel Roth wrote:
> 
> > My laptop's wlan1 interface is connected to a wireless
> > router, using wpa_supplicant (via wpa_gui).
> 
> You don't use NM as well, do you?

Correct, if by NM you mean Gnome (or perhaps KDE) network manager.

> > Every few minutes, DNS lookup fails. Output of ifconfig
> > shows that eth1 and eth1:avahi interfaces have come up.
> 
> May we see the output of ifconfig and your interfaces file in
> /etc/network?

ifconfig (DNS queries, i.e. "dig google.com" fails - no
servers could be reached)


eth1      Link encap:Ethernet  HWaddr f0:de:f1:19:e6:be  
          UP 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:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:20 Memory:f2600000-f2620000 

eth1:avahi Link encap:Ethernet  HWaddr f0:de:f1:19:e6:be  
          inet addr:169.254.11.90  Bcast:169.254.255.255  Mask:255.255.0.0
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          Interrupt:20 Memory:f2600000-f2620000 

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:45292 errors:0 dropped:0 overruns:0 frame:0
          TX packets:45292 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:4076447 (3.8 MiB)  TX bytes:4076447 (3.8 MiB)

wlan1     Link encap:Ethernet  HWaddr 1c:65:9d:63:33:6e  
          inet addr:10.255.25.105  Bcast:10.255.25.255  Mask:255.255.255.0
          inet6 addr: fe80::1e65:9dff:fe63:336e/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:74266 errors:0 dropped:0 overruns:0 frame:0
          TX packets:19919 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:27828234 (26.5 MiB)  TX bytes:3603772 (3.4 MiB)
          Interrupt:17 Memory:ffffc90023668000-ffffc90023668100 

DNS queries work after bringing down eth1 (and with it eth1:avahi)
/etc/network/interfaces, and re-issuing "dhclient wlan1".

    auto lo
    iface lo inet loopback
 
> Do you use avahi for anything?

Not that I know of. I never deliberately installed it; 
it got pulled in during an upgrade.

Regards,

Joel


-- 
Joel Roth