On Nov 28, 2005, at 1:46 PM, John Palmer wrote:
I am running FreeBSD 5.4 p8. I did a tcpdump -vv -i em0. The
output produced
a "bad udp cksum" with my DNS server. Does anyone know what it
means? Or, how I can
correct the problem?
If you are sniffing traffic from the machine itself, tcpdump is
seeing the packets before the networking stack has computed the
packet checksums...this is especially likely to be true if the TXCSUM
option is on, check ifconfig.
In order to double-check this, try sniffing the traffic from another
machine.
--
-Chuck
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