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- Newsgroups: vmsnet.networks.tcp-ip.multinet
- Subject: Re: DECwindows over IP problem and an FDDI problem.
- Message-ID: <42E00EC010SEP92195749@TGV.COM>
- From: LPZ@LUDWIG.CTD.ORNL.GOV
- Date: 10 SEP 92 19:57:49 GMT
- Organization: The INFO-MULTINET Community
- X-Gateway-Source-Info: INTERNET
- X-Return-path: <info-multinet-relay@TGV.COM>
- X-RFC822-From: LPZ@LUDWIG.CTD.ORNL.GOV (Lawrence MacIntyre)
- X-Vmsmail-To: SMTP%"R.E.Sonneveld%research.ptt.nl"
- Nntp-Posting-Host: Mvb.Saic.Com
- Lines: 51
-
- >We've two problems. Hope you can help us.
- >
- >1. The first problem is related to the opening of a DECwindows window
- > over TCP/IP on a Multinet host. We get the following error
- > message. I can't find it neither in the Multinet manual, nor in
- > the DECwindows User Guide.
- >
- >> dectermport failed to find language, XOpenDisplay("") returned NULL
- >> %DECW-F-CANT_OPEN_DISPL, Can't open display
- >
- >Anyone triggered?
- The only time I ever saw this was in an early DECnet/OSI field
- test. From the context, I inferred that the transport wasn't
- loaded when DECwindows server was started, but this wasn't the
- case. A later update solved the problem. Perhaps you are
- starting DECwindows before Multinet is fully running.
-
- >2. On our Multinet host we've both an ethernet and an FDDI interface.
- > The default route is via ethernet. Changing the default route to
- > FDDI gives me a lot of unreachable systems on the ehternet behind
- > our cisco. Hope someone can tell me how to make the FDDI the
- > default route?
- >
- > Another problem is, that the fddi interface is not reachable from
- > other systems. However, if I first do a ping from the multinet
- > host towards such a system, than that system (if it's on fddi) is
- > placed in the ARP table, and then the fddi interface *is*
- > reachable from that system. This trick doesn't work from an
- > ethernet host, because the ethernet cisco interface is the only
- > (default) route in the ARP table. What should I do to make the
- > FDDI interface available towards any system on our LAN?
-
- This one gets me too. The problem is bad code in your Cisco box.
- They are aware of it and promise a fix. You probably have a
- bridge between your ethernet and your FDDI ring and your Cisco
- has both FDDI and ethernet interfaces. The problem is that an
- ARP reply is seen by the router on both sides, and the ethernet
- (almost) always sees it last. If you login to the Cisco and type
- SHOW ARP, you will see that your FDDI interface is seen on the
- ethernet side. Interestingly, if an ethernet interface is seen
- on the FDDI side, it works... Anyway, the workaround is to put a
- permanent ARP entry for your FDDI interfaces (all of them that
- you wish to be able to talk through the Cisco) in the router.
- There are many strange behaviors associated with this problem,
- and I don't wish to keep typing for the next two days, I will
- merely tell you that this workaround has proved 100% effective
- for us.
- Lawrence
- ~
- p.s. I have used the words "router" and "Cisco" interchangeably
- in the above text. Sorry for any confusion...
-