Thank you, but unfortunately this is a different issue. These boxes do not run bind, they resolve their DNS queries via dedicated bind servers on the network. Configuring the bind servers on the network a different way still would not stop the IPv6 traffic I am showing in the TCP dump from being sent. On 4/4/2011 11:54 AM, Stephen Harris wrote: > On Mon, Apr 04, 2011 at 11:34:25AM -0500, Russell Jones wrote: >> [root at hostname1 ~]# tcpdump -vvvvv 'port 53' >> tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 >> bytes >> >> 11:07:24.989304 IP (tos 0x0, ttl 64, id 65039, offset 0, flags [DF], >> proto: UDP (17), length: 60) hostname1.59725> >> vdns1-hc.example.com.domain: [bad udp cksum 2bd2!] 26130+ AAAA? >> hostname2.example.com. (32) > > Check https://bugzilla.redhat.com/show_bug.cgi?id=140528 and see if > that resolves your issue. >