On Sun, Mar 30, 2003 at 10:55:42AM -0800, Michael West wrote: > If I have found a bug then I will file a bug report. > My knowledge is imperfect. I thought I would check here first > before filing. > > I am getting a report from tiger that squid is listening UDP on a high > port. This is not the peer cache listener as I have disabled that > with the "-u0" squid command line option. > > `lsof -nPi | grep squid` gives: > > squid 19509 root 5u IPv4 2036491 UDP *:32814 > squid 19509 root 12u IPv4 2036495 TCP 127.0.0.1:3128 > (LISTEN) > > My understanding is that this UDP port is used by squid for its DNS > client. I do not understand why squid would want to bind to a port > for this. The port number changes when I restart squid.
Yes, that sounds right. Squid binds to a port for it's DNS resolver
simply because it expects to do so much DNS resolving that it's faster
to just fire the requests off and have an already-existing place for
them to arrive back at.
> Tiger reports this as listening on port 32814, which I do not think
> is correct.
That's what it's doing. Although it (hopefully) drops unsolicited
packets, it may not.
> If lose is found on the system
> /usr/lib/tiger/systems/Linux/2/check_listeningprocs uses the
> command:
>
> $LSOF -nPi | $GREP "IPv" | $GREP -v "\->" | $AWK '{printf("%s %s %s
> %s\n", $1, $3, $7, $8)}' | $SORT | $UNIQ |
>
> It seems that it should `grep LISTEN` as well.
>
> Comments?
I would guess that only TCP sockets get 'LISTEN' but I don't
know the output of lsof to confirm this.
--
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Paul "TBBle" Hampson, MCSE
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The Boss, Bubblesworth Pty Ltd (ABN: 51 095 284 361)
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-- Kristian Wilson, Nintendo, Inc, 1989
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