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Old 07-08-2014, 09:37 AM   #1
boot0user
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Network problems with new kernel in Debian.


Hello!

Last updated kernel to 3.2.0-4-686-pae on my Debian firewall via apt-get. Previous kernel package was linux-image-3.2.0-4-686-pae_3.2.57-3+deb7u2_i386 and the last is linux-image-3.2.0-4-686-pae_3.2.60-1+deb7u1_i386.

After that, most of the sites was opened after long delays or not open at all.

No errors on the console. I do not know where to look for the problem.

Help, please.
 
Old 07-08-2014, 03:52 PM   #2
jefro
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Put the old kernel back in and see if that corrects it. I rather doubt it can be the kernel but you will have to test something. Use other route tests also. May need to try wireshark even.
 
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Old 07-08-2014, 10:33 PM   #3
nmo
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I noticed the same issues when I updated to the security fixed (ptrace issue) kernel 3.2.60-1+deb7u1 (I was using the amd64 one though), when I returned to the 3.2.57-3+deb7u2 kernel my networking went fine. While I have not posted the bug myself on debian, it looks like it has been posted Bug#754173 (bugs.debian.org). Not much action yet. The problem with a kernel bug is it requires a reboot, and a lot of people need to schedule those for their servers, so you may not see a lot of people reporting the issue yet.
 
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Old 07-09-2014, 01:05 AM   #4
boot0user
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Quote:
Originally Posted by nmo View Post
I noticed the same issues when I updated to the security fixed (ptrace issue) kernel 3.2.60-1+deb7u1 (I was using the amd64 one though), when I returned to the 3.2.57-3+deb7u2 kernel my networking went fine. While I have not posted the bug myself on debian, it looks like it has been posted Bug#754173 (bugs.debian.org). Not much action yet. The problem with a kernel bug is it requires a reboot, and a lot of people need to schedule those for their servers, so you may not see a lot of people reporting the issue yet.
Thanks for reply. Looks like my case.
 
Old 07-09-2014, 06:16 PM   #5
nmo
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For those interested there is now some additional information under the debian bug report. It now links 2 bugs together. The current work around is to use ethtool to turn off the gro feature on your nic.

To make this survive booting, edit /etc/network/interfaces

Add a line:
pre-up /sbin/ethtool -K eth0 gro off

you will need 1 line per interface, and change eth0 to your correct nic.

It seems the bug is related to routing/nat.

I can confirm for my network configuration the work around seems to be working so far.
 
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Old 07-10-2014, 01:11 AM   #6
boot0user
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Quote:
Originally Posted by nmo View Post
For those interested there is now some additional information under the debian bug report. It now links 2 bugs together. The current work around is to use ethtool to turn off the gro feature on your nic.

To make this survive booting, edit /etc/network/interfaces

Add a line:
pre-up /sbin/ethtool -K eth0 gro off
Thanks again. I already read about solution, upgrade the kernel and made changes in /etc/network/interfaces.
 
  


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