> My nameserver is set to 192.168.7.1 (which is running when I'm
> connected to my ISP, otherwise not). The resolver routines open a
> SOCK_DGRAM type connection, then make eight attempts to query the
> nameserver. If the nameserver is NOT running (when the connection to
> the outside world is down), the SOCK_DGRAM connection normally
> opens, accepts data, doesn't 'hang' on the select() that follows,
> but should send ECONNREFUSED at the attempt to read from the socket.
> Unfortunately, on the 7th of the 8 attempts, the select() hangs for
> its full duration (20 seconds in this case), times out, and slows
> everyone down.
Adding before the return
/* No rate limit on loopback */
if (dst->dev && (dst->dev->flags&IFF_LOOPBACK))
return 1;
to net/ipv4/icmpc.c : icmpv4_xrlim_allow() will probably fix it.
-Andi
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