In article <d3jrjs$hmf$1@colwyn.zhadum.de>,
	tron@zhadum.de (Matthias Scheler) writes:
> after upgrading my server from NetBSD 2.0.2 to 3.0_BETA its clients started
> to experience DNS service problems. "netstat -s -p udp" suggested that
> the problem is related to UDP packets with bad checksums.
[...]
> Any ideas?

Wolfgang S. Rupprecht suggested to make the following changes with "sysctl":

net.inet.ip.do_loopback_cksum=1
net.inet.tcp.do_loopback_cksum=1
net.inet.udp.do_loopback_cksum=1
net.inet6.tcp6.do_loopback_cksum=1
net.inet6.udp6.do_loopback_cksum=1

And that fixed the problem. But why is that necessary?

	Kind regards

-- 
Matthias Scheler                                  http://scheler.de/~matthias/