mcdermot@merlin.unm.edu (John McDermott) (11/02/87)
Organization:Applied Technology Asociates I have a problem which I hope someone has already solved: I have a TCP/IP net and a large DECnet net both served by a common VAX (vms). Some hosts on the decnet network also run tcp/ip. All tcp is CMU/TEK for vms. Now the question: are there drivers to encapsulate ip packets, send them over the DECnet and then make them available for retransmission at the other end? I need this because my VAX with Decnet is connected to the rest of the DECnet network by a 56kb line and that line cannot be used for both decnet and tcp/ip (for political reasons at least). Any help would be really appreciated. Try afwl-vax.arpa!atavax.decnet!mcdermott or maybe there is enough interest here you should just post any results. Thanks. --john John McDermott ARPA: mcdermott%atavax.decnet@afwl-vax.arpa Applied Technology Assoc W (505) 247-8371 1900 Randolph SE Albuquerque, NM 87106 H (505) 255-7796
PAP4@AI.AI.MIT.EDU ("Philip A. Prindeville") (11/08/87)
Date: 2 Nov 87 19:34:27 GMT
From: unmvax!merlin!mcdermot@ucbvax.Berkeley.EDU (John McDermott)
I have a problem which I hope someone has already solved: I have a
TCP/IP net and a large DECnet net both served by a common VAX (vms).
Some hosts on the decnet network also run tcp/ip. All tcp is CMU/TEK for vms.
Now the question: are there drivers to encapsulate ip packets, send them
over the DECnet and then make them available for retransmission at the other
end? I need this because my VAX with Decnet is connected to the rest of
the DECnet network by a 56kb line and that line cannot be used for both
decnet and tcp/ip (for political reasons at least). Any help would be really
appreciated.
Well, you did say `any'. Mike Parker at McGill University (address
musocs!mcgill-vision!mouse@eddie.mit.edu) wrote an IP over DECnet
device driver for UNIX 4.3BSD. If you have any 4.3 hosts on your
subnet, you could make it the IP gateway to the other side of that
phone line. I believe that is what they do at McGill and it seems
to work fairly well. I heard about someone doing the same for VMS,
but I don't remember who (was it Lou Salkind at NYU?)
Hope this helps,
-Philipron@TOPAZ.RUTGERS.EDU (Ron Natalie) (11/08/87)
Wollongong makes such a thing (I believe they call it dbridge). We used it for a while and although it worked just fine, it was real slow for the IP traffic. However, I talked to some people more recently and they say that it is much improved. We stopped running it because we put a more sophisticated serial line in place. Your only other alternative is to use one of the routers that does both IP and DECNET (Proteon, CISCO...) or something like a level-2 serial bridge (UB Data Link Bridge, Vegalink TRANSLan). -Ron