Date: Sat, 30 Apr 2011 22:08:54 -0700 From: Bakul Shah <bakul@bitblocks.com> To: freebsd-net@freebsd.org Subject: Strange DNS problem Message-ID: <466DA43B-EFF4-45DB-83C7-D6DD2B86CB35@bitblocks.com>
next in thread | raw e-mail | index | archive | help
I am running a local dns server (bind9). It works ok for the most part but a number of domains do not resolve and I have not been able to detect any pattern. For instance $ host weather.com=20 Host weather.com not found: 3(NXDOMAIN) Here is the tcpdump output (on the internal side): 21:45:14.662220 IP 192.168.125.253.20204 > 192.168.125.9.53: 16136+ A? = weather.com. (29) 21:45:14.662696 IP 192.168.125.9.53 > 192.168.125.253.20204: 16136 = ServFail 0/0/0 (29) 21:45:14.663090 IP 192.168.125.253.59705 > 192.168.125.9.53: 4383+ A? = weather.com.bitblocks.com. (43) 21:45:14.663193 IP 192.168.125.9.53 > 192.168.125.253.59705: 4383 = NXDomain* 0/1/0 (94) What is strange is *nothing* goes out of my network when such a failure occurs! [My gateway machine does NAT on the internal side but the symptom is the same on the gateway machine] I ignored the problem for a while but recently I noticed a few more domains do not resolve! May be nothing has changed since I didn't try these domains before. This is on 8.2-release (but the symptom was the same with 8.1 and may be earlier). I checked named.conf and AFAIK it seems ok -- it has not changed substantially since 2006 (I moved to a different IP block and had to change my ISP's dns server address -- it is my secondary). I'd appreciate any hints on how to diagnose this. Thansks!
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?466DA43B-EFF4-45DB-83C7-D6DD2B86CB35>