Hi,
I am having a bit of a problem. One might say, a serious problem. :( When
other servers query my name servers, they send queries with a source port of
53; but apparently my BIND (8.3.4) is responding from a high port (seemingly
random). And this is causing some trouble. :( How can I prevent that??
In my "options" section I have
query-source address * port 53;
But my log is filled with entries like these:
Accept UDP 10.0.0.2:53 194.112.32.1:1024 out via rl0
Accept UDP 10.0.0.2:53 209.73.14.10:38992 out via rl0
Accept UDP 10.0.0.2:53 165.250.91.52:53 out via rl0
Accept UDP 10.0.0.2:53 209.73.14.10:38992 out via rl0
Accept UDP 10.0.0.2:53 15.243.160.33:32857 out via rl0
Accept UDP 10.0.0.2:53 194.205.246.130:42876 out via rl0
Accept UDP 10.0.0.2:53 198.49.218.20:53 out via rl0
Accept UDP 10.0.0.2:53 203.2.75.109:53 out via rl0
Accept UDP 10.0.0.2:53 146.18.16.248:53 out via rl0
Accept UDP 10.0.0.2:53 15.251.160.31:32852 out via rl0
Accept UDP 10.0.0.2:53 15.251.160.31:32852 out via rl0
Which seems to suggest that for outgoing UDP a random high port is being
used. :( And I do not understand why. :(
I have only four ipfw rules defined regarding DNS:
${fwcmd} add 3 allow tcp from any to any 53 out via ${outside}
${fwcmd} add 4 allow udp from any to any 53 out via ${outside}
${fwcmd} add 5 allow tcp from any 53 to any in via ${outside}
${fwcmd} add 6 allow udp from any 53 to any in via ${outside}
Why is BIND using high ports for outgoing udp? And how do I stop it?
I appreciate your comments, as this is truly becoming a problem.
- Mark
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