How do I disable high ports?

Kevin Darcy kcd at daimlerchrysler.com
Tue Jan 28 18:45:51 UTC 2003


Mark wrote:

> <phn at icke-reklam.ipsec.nu> wrote in message
> news:b15agi$23c$1 at isrv4.isc.org...
>
> > Mark <admin at asarian-host.net> wrote:
> >
> > > Hi,
> >
> > > I am having a bit of a problem. When other servers query my name server
> > > s, they send queries with a source port of 53; but apparently my BIND
> > > (8.3.4) is responding from a high port. And this is causing some
> > > trouble. :( How can I prevent that??
> >
> > > Please, I am really in a BIND, as they say. :)
> >
> > You seem to have faulty Firewall-rules. Fix them.
>
> I am not sure what you mean. If you are suggesting I am instructing my
> firewall to redirect traffic from port 53 to a higher port (out), I am not.
>
> 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 UPD a random high port is being
> used. :( And I do not understand why. :(

You're not responding *from* high UDP ports; you're responding *to* high UDP
ports. This is perfectly normal. What kind of "trouble" is it causing?


- Kevin




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