> On Aug 15, 2014, at 3:55 AM, Sascha E. Pollok <[email protected]> wrote: > > Hello networking fellows! > > We are trying to find the cause of a corrupt local DNS cache of a Cisco 1803 > running 15.1(4)M8 (also appeared on 12.4something - 15.1 ist just a desperate > attempt of solving). > > The router acts as a local DNS resolver for locally connected clients using > "ip dns server". > > Every now and then it seems to break locally cached IPv4 A-RRs like this: > > Router#show hosts > test.fqdn.fqdn None (temp, OK) 0 IP 0.0.0.5 <--- > > This seems to happen for hosts that also have an AAAA RR. To us it looks like > it mixes AAAA and A records as the IPv6 address for this host is [...]::5. > This happens with other hosts too. > > The host is sometimes first seen correctly with an "IP" and "IPv6" entry in > the cache but then changes to the broken "IP" RR while sometimes even keeping > the correct IPv6 entry. It never happens to the IPv6 address. > > Debugging "debugging domain" and "debugging domain replies" didnt give a clue.
Sascha, This looks like the symptoms of bug CSCub00466, where IPv4 entries are corrupt when an IPv6 PTR query takes place. Can you please open a case with us (Cisco TAC) so we can track this down? Javier Henderson [email protected] _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
