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- Path: sparky!uunet!mcsun!sun4nl!tuegate.tue.nl!eba!ebh!wjw
- From: wjw@ebh.eb.ele.tue.nl (Willem Jan Withagen)
- Newsgroups: comp.sys.apollo
- Subject: Re: Apollo TCP woes
- Message-ID: <1811@eba.eb.ele.tue.nl>
- Date: 18 Dec 92 09:26:25 GMT
- References: <1992Dec17.002418.6709@ssigv.UUCP>
- Sender: news@eb.ele.tue.nl (The News system)
- Organization: Eindhoven University of Technology, The Netherlands
- Lines: 55
-
- In article <1992Dec17.002418.6709@ssigv.UUCP> gdonl@sunrise.ssi1.com (Don Lewis) writes:
- =>Rlogin connections from a node on the token ring to HP 700 and Sun
- =>nodes nodes on our ethernet using an Apollo as a TCP/IP router between
- =>the networks are occasionally dropped. It appears that the Apollo being
- =>used as a router is sending an ICMP {NET,HOST} UNREACHABLE to to the token
- =>ring only node, which then drops the connection. We aren't real sure since
- =>we don't have a way to sniff packets on the token ring. We haven't yet
- =>seen anything suspicious on the ethernet. The router node shouldn't be
- =>sending these packets, since it is directly attached to both networks.
- =>The other node should not drop an existing connection upon the receipt of
- =>an ICMP UNREACHABLE since this may be a transient condition.
-
- We had/have so same type of problems in connecting to an SGI/IRIX system.
- (Which also want to run -notrailers. :{ )
-
- We've got one main ring, a gateway apollo to the backbone, and several thinnet stretches
- which run from an apollo to a PC-router. The PC-router is also connected to the
- backbone as backup gateway:
-
- --------------------BACKBONE--------------------------------------------------------
- | | |
- +--------+ +--------+ +--------+
- | apollo | | PC | | SUN |
- | gate | | gate | | 3/110 |
- +--------+ +--------+ +--------+
- | | |
- | +---+ 900/400s |
- | | +------------------------------------+-----------------------
- | +---+ | | ||||||||||||
- | | +---+ 9000/ +---+ SGI +-----------------+
- . . | | 400dl | | | PC's + PC-NFS |
- . . +---+ +---+ +-----------------+
- . .
-
- Now the fun part is:
- - the SUN can get to the SGI no materwhat.
- - THE SGI refuses to recognise the HP9000's ever!!
- - the 400s and 400dl talk perfect dds and tcp/ip
- - the PC can use both HP9000's and the SGI (NFS,telnet,ftp,...)
- - Everything can go through the Apollo-gate, except the SGI
- - but the PC-router is always in a bad shape
-
- Now things improve a little when I switch off, the 400dl
- But when we started running '/etc/tcpd -c -b -p0' did all the problems go away.
-
- I'm to much of an TCP/IP illiterate to know what I've violated, but this
- works. And our users (Mainly me :-) ) are much happier.
- And now I can pull the plug on the Apollo-gate, and thing just get rerouted
- through the PC-router. At a lower speed, but traffic doesn't stop :-)
-
- Willem Jan
- Digital Information Systems Group, Room EH 10.35
- Eindhoven University of Technology
- P.O. 513 Tel: +31-40-473401,Fax: +31-40-448375
- 5600 MB Eindhoven The Netherlands
-