Hi Steven

   There is a bug about icmp netunreach.
If the kernel does not find a route for a packet, it must send a icmp netunreach packet
   to the source host, and  discard  the packet.
But the latest kernel does not send a icmp netunreach packet because of the fib_lookup
   return value  of -ESRCH when a route  is not found.

I found a your patch about why changes the "not found" error return for the
   lookup function to -ESRCH. But I think this is not correct.
Your patch is as following: http://git.kernel.org/?p=linux/kernel/git/davem/net-2.6.git;a=commitdiff;h=83886b6b636173b206f475929e58fac75c6f2446

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