[99948] in RedHat Linux List
Re: FW: help needed with talk
daemon@ATHENA.MIT.EDU (Guy Warner)
Tue Nov 17 17:09:17 1998
To: redhat-list@redhat.com, "Soffen, Matthew" <msoffen@iso-ne.com>
In-Reply-To: Your message of "Tue, 17 Nov 1998 16:31:41 EST."
<A17D93A46315D1118FF20020182ACFBB6F3183@msexchange.iso-ne.com>
Date: Tue, 17 Nov 1998 22:07:39 +0000
From: Guy Warner <gcw@dcs.st-and.ac.uk>
Resent-From: redhat-list@redhat.com
Reply-To: redhat-list@redhat.com
> Hmm.. I just did an experiment.
>
> I had it so that my talk daemon was disabled in inetd on my linux
> server. It would give me
> this when I attempt to talk to another machine:
> [Error on read from talk daemon : Connection refused (111)]
>
> This seems to be the same error you had, correct ?
>
> Is in.ntalkd enabled in your systems inetd.conf ? This appears to be
> the daemon needed to talk to external machines.
> When I got the 111 error, in.ntalkd was disabled.
>
>
Thats interesting, but unfortunately the lines in my inetd.conf are as follows
talk dgram udp wait root /usr/sbin/tcpd in.talkd
ntalk dgram udp wait root /usr/sbin/tcpd in.ntalkd
I am not using dtalk (I am not sure what it is). Your findings seem to confirm
my suspicion that linux and the suns are not using the same protocol. I have
now tested several linux boxes (all on a fairly default redhat setup) and
severel suns and the linux boxes can happily talk to each other as can the
suns to the other suns. Another possibility I have noticed is that in my
/etc/services file I have the following
talk 517/udp # BSD talkd(8)
ntalk 518/udp # SunOS talkd(8)
whereas if I watch two suns talking to each other using tcpdump I see the
following
21:56:30.821306 sun1.talk > sun2.42627: udp 24
21:56:30.821306 sun2.42627 > sun1.talk: udp 76 (DF)
I have noticed also the following two comments in the /etc/services on the sun
<at the top>
# Network services, Internet style
# This file is never consulted when the NIS are running
<in the middle>
# UNIX specific services
#
# these are NOT officially assigned
Does this mean that when NIS is in use the port number is determined
differently. I use NIS on my linux box as do all the suns, but there have been
some difficulties involving the version of NIS on the linux boxes talking to
NIS on the suns.
Any ideas?
Guy Warner
_______________________________________________________________________________
Address: Mathematics Institute, University of St.Andrews,
St. Andrews, Fife KY16 9SS
E-mail: gcw@dcs.st-and.ac.uk (primary)
gcw@st-and.ac.uk
Telephone: 01334 463732
Fax: 01334 463748
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