Hans:

InterMapper does a WINS lookup for the machine name when it can't be determined
from DNS. However, your tcpdump clearly shows that the router interface has a
DNS name. Do you have the addresses of your DNS servers configured in the DNS
Monitor preference setting?

The WINS lookup appears to be a unicast request. InterMapper uses a directed,
unicast request when it is attempting to lookup a specific name. What is the
frequency of these requests?  It could be that InterMapper is not properly
"backing off" when the ICMP unreachable packet is received. I will need to check
the code.

Thanks,

Bill Fisher
Dartware, LLC
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