Date: Fri, 16 Apr 1999 12:46:34 -0400 (EDT) From: Luoqi Chen <luoqi@watermarkgroup.com> To: brian@Awfulhak.org, luoqi@watermarkgroup.com Cc: camel@avias.com, current@FreeBSD.ORG Subject: Re: some news about ftp hangs Message-ID: <199904161646.MAA17733@lor.watermarkgroup.com>
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> > Here's async log output from alias enabled ppp, while ftp was retransmitting
> > the PORT command packet:
> >
> > Async: 7e 3d c0 00 00 9d 21 45 00 00 38 13 42 00 00 ff
> > ^^
> > Async: 01 e3 a7 cf ca 49 aa d0 17 db 4e 03 03 a2 f8 00
^^ ^^ ^^
protocol = ICMP unreachable port
> > Async: 00 00 00 45 00 00 39 a4 4e 00 00 2e 11 79 35 d0
> > ^^ ^^
UDP
> > Async: 17 db 4e cf ca 49 aa 04 00 00 35 00 25 00 00 e3
^^^^^
port 53 = DNS
> > Async: 69 7e
> >
> > If looked like somehow the first ip frame was overwritten by a second ip
> > frame...
>
> Hmm, I don't see any PORT command in there ;-/
>
Sorry, this is a legitimate ICMP packet: port unreacheable. It looks like
the ftp server (ftp.freebsd.org) was making an UDP query to DNS port on
the client (which happens to have a named server running, but that's just
for the internal network, external ip address is served by an outside server)
and the client responds with port unreacheable even though there is a named
running. I'm totally confused. I'll try to find out more. By the way, if
I turn off aliasing (set alias enable off), ftp works fine again.
-lq
> --
> Brian <brian@Awfulhak.org> <brian@FreeBSD.org>
> <http://www.Awfulhak.org>; <brian@OpenBSD.org>
> Don't _EVER_ lose your sense of humour ! <brian@uk.FreeBSD.org>
>
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