Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!hp4nl!nikhefh!a20
From: a20@nikhefh.nikhef.nl (Marten Terpstra)
Newsgroups: comp.protocols.tcp-ip.domains
Subject: Re: problems with nsfnet-relay.ac.uk
Message-ID: <1164@nikhefh.nikhef.nl>
Date: 28 Feb 91 15:02:53 GMT
References: <1991Feb27.142600.8252@mp.cs.niu.edu> <9102281006.AA28115@rimfaxe.diku.dk>
Sender: terpstra@nikhef.nl (Marten Terpstra)
Reply-To: a20@nikhefh.nikhef.nl (Marten Terpstra)
Distribution: inet
Organization: Nikhef-H, Amsterdam (the Netherlands).
Lines: 43

In article <9102281006.AA28115@rimfaxe.diku.dk> thorinn@RIMFAXE.DIKU.DK (Lars Henrik Mathiesen) writes:

[stuff deleted]

>I can connect to SMTP on that host, so it doesn't seem to be filtered.
>Interestingly, from Europe this is routed through 192.16.192.185:
>
>    ;; ANSWERS:
>    185.192.16.192.in-addr.arpa.    15594   PTR     sun.nsfnet-relay.ac.uk.
>
>    ;; AUTHORITY RECORDS:
>    192.16.192.in-addr.arpa.        447592  NS      MCSUN.EU.NET.
>    192.16.192.in-addr.arpa.        447592  NS      SERING.CWI.NL.
>
>but it doesn't seem to the same machine (doesn't do telnet, for
>instance).

Sorry about this. This is due to a wrong inverse mapping of 192.16.192.185.
This machine used to be sun.nsfnet-relay.ac.uk, but has been switched to a
cisco a few months ago. The reverse mapping should say cisco.ulcc.ac.uk. I'll
see to it that it will be changed in the reverse mapping of 192.16.192.

The network of 192.16.192 is used within Europe for IP over X.25, mainly for
IP over IXI. This may cause unreachability of these numbers, because they are
spread all over Europe, not necessarily connected. But since this are only
routers, you would not have the need to get in. For those managing these
ciscos (and suns) on 192.16.192 there is of course another way to get in ;-)

The link that people in Europe use to get to the UK is via NIKHEF in
Amsterdam, then via IP over IXI to ULCC in London where the
*.nsfnet-relay.ac.uk machines are located.

I also noticed that today I cannot reach nsfnet-relay on port 25. The guy
managing this machine is here, so I will ask him.

Hope this is solved soon.

Marten
--
Marten Terpstra                                  National Institute for Nuclear
Internet : terpstra@nikhef.nl 		                and High Energy Physics
Oldie-net: {....}mcsun!nikhefh!terpstra	      (NIKHEF-H), PO Box 41882, 1009 DB
Phone    : +31 20 592 5102                           Amsterdam, The Netherlands