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Abbadon
n00b
Joined: 18 Jan 2006
Posts: 13
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 Posted: Sat Feb 04, 2006 3:32 pm Post subject: Strange Network problem on U60 |
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Running 2.4 kernel.
When booted from the LiveCD everything works fine.
When booted from disk there is no external networking. I can ping outside the network but that's it.
SSH works fine.
Weeve helped me a bit on this. There is a place in the Kernel, TCP Explicit Congestion Notification, that he had me remove. In the process we did something else and the machine started working. Well I built the new kernel and installed it but now after a reboot the machine has the same network problem.
Thanks. |
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Weeve
Retired Dev
Joined: 30 Oct 2002
Posts: 641
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| Posted: Sat Feb 04, 2006 9:45 pm Post subject: |
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Basically the issue is TCP explicit congestion notification support in the kernel. This can make for a weird condition where you can't really route off the subnet but for no apparent reason.
Easy on the fly fix is to run the following
| Code: | | echo 0 > /proc/sys/net/ipv4/tcp_ecn |
Permanent fixes are to either remove it from the kernel or edit /etc/sysctl.conf and make sure the following line is uncommented:
| Code: | | net.ipv4.tcp_ecn = 0 |
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Abbadon
n00b
Joined: 18 Jan 2006
Posts: 13
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| Posted: Sun Feb 05, 2006 4:17 am Post subject: |
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This problem is fixed.
The major problem was the weird condition and this dumb newbie. |
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