Re: Internet stops working right after startup

[Mark Chong <mchong@qk.com.au>]

Frank,

While i'm not entirely sure im gona say segfault = bad.

What kernel are you running? have you tried a newer version?
And have you tried another nic?


Frank Razenberg wrote:
> Hi Mark,
>
> The route does not change after this. I use "ifdown eth0" and "ifup 
> eth0" but "/etc/init.d/networking restart" works as well.
>
> I monitored dmesg and found this:
>
>    [  422.079991] EXT3 FS on sda1, internal journal
>    [  422.483633] loop: module loaded
>    [  423.039841] ip_tables: (C) 2000-2006 Netfilter Core Team
>    [  423.055658] nf_conntrack version 0.5.0 (16384 buckets, 65536 max)
>    [  423.093037] ifup[5845]: segfault at 0 ip 7fbd4bce9882 sp
>    7fff541b78d0 error 4 in libc-2.7.so[7fbd4bc4b000+14a000]
>    [  426.970376] NET: Registered protocol family 10
>    [  426.974379] lo: Disabled Privacy Extensions
>    [  427.134712] ifup[5939]: segfault at 0 ip 7fbd4bce9882 sp
>    7fff541b78d0 error 4 in libc-2.7.so[7fbd4bc4b000+14a000]
>    [  427.152782] r8169: eth1: link up
>
> I think this means some program crashes and eth0 is not brought up 
> correctly. I have no idea why it does work if I try again though. Any 
> further tips?
>
> Frank
>
> Mark Chong wrote:
> > Frank,
> >
> > Does the output of ifconfig and route -n change after you take down 
> > eth0 and bring it up again?
> > also how are you taking it down and bring it up again?
> >
> > dmesg will show you if for some reason you lost your link
> >
> >
> > Frank Razenberg wrote:
> > > Hi,
> > >
> > > I've attached the logs Mark asked for. I removed all iptables rules 
> > > but the ones to allow ip masquerading. The problem still persists. I 
> > > can ping the internal hosts just fine though. The only thing that 
> > > seems to solve this is to bring down eth0 and bring it up again. Are 
> > > there any logs I can read to help identify this problem?
> > >
> > > Frank
> > >
> > > Ajitabh Pandey wrote:
> > > > 2009/1/21 Frank Razenberg <frank@zzattack.org 
> > > > <mailto:frank@zzattack.org>>
> > > >
> > > >     Hi Ajitabh,
> > > >
> > > >     I attached the information you asked. Apologies for the mail I
> > > >     just sent to your address instead of to the mailing list.
> > > >
> > > >  
> > > >
> > > >     [snip...]
> > > >
> > > >
> > > > Thanks for the info. Although this has nothing to do with your 
> > > > problem, but check your config of the INPUT chain. All incoming 
> > > > connections are allowed. Also, to rule out the firewall completely, 
> > > > just drop your firewall for the testing and see whether you have 
> > > > problems.
> > > >
> > > > Also when this problem happens, can your internal hosts ping the 
> > > > Debian machine or connect to it?
> > > >
> > > > Regards.
> > > > --  Ajitabh Pandey
> > > > http://www.ajitabhpandey.info/ | http://www.unixclinic.net/
> > > > ICQ - 150615062
> > > > Registered Linux User - 240748