> 209.**.**.*** sent an invalid ICMP error to a broadcast messages
> every 15 sec.
> This never happened in 2.0.36 kernel.
The source does state:
* Check the other end isnt violating RFC 1122. Some routers send
* bogus responses to broadcast frames. If you see this message
* first check your netmask matches at both ends, if it does then
* get the other vendor to fix their kit.
You can do an
echo 1 > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses
to get this check to be ignored.