On Fri, 8 Jul 2005, Denis Vlasenko wrote:
The problem is, I can't see what is causing this misconfiguration
or whatever. I wasn't able to capture such a packet so far either --
it never happened while tcpdump was running.
You may try to add printk("bad boy is: %s\n", current()->comm)),
or dump_stack(), or something like that in icmp path of IP stack.
(I am currently tracking an intermittent network problem
on my home box in similar way).
Note the local IP address mentioned is different, I've
seen 3 so far, all 3 are local on this box and are on 3
different (ethernet) interfaces (but the ICMP always comes
from lo).
BTW what tcpdump actually shows?
--
vda
Please read line 1148 of /usr/src/linux-`uname -r`/net/ipv4/icmp.c.
The error message is in response to a bogus frame. The NETMASK
must match at both ends (a configuration error). If the mask matches,
then you can turn off the messages with 'sysctl', i.e., ....
`echo "1" >/proc/sys/net/icmp_ignore_bogus_error_responses`.
Otherwise, find the interface netmask that's broken and fix it.
Cheers,
Dick Johnson
Penguin : Linux version 2.6.12 on an i686 machine (5537.79 BogoMips).
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