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- From: harvey@indyvax.iupui.edu
- Newsgroups: comp.sys.novell
- Subject: Re: HELP: I want to access a DECNET host through a v3.11 Server
- Message-ID: <1992Dec22.160358.191@indyvax.iupui.edu>
- Date: 22 Dec 92 16:03:58 -0500
- References: <BznDIx.7C0@world.std.com>
- Organization: Indiana University-Purdue University at Indianapolis
- Lines: 80
-
- In article <BznDIx.7C0@world.std.com>, dlowe@world.std.com (Miller Lowe) writes:
- > In our office we have Three Netware Servers, A couple
- > of VAX and tens of PCs. We want to connect the PCs to the VAX
- > systems using a LAT terminal emulator such as SmartTerm 340.
- >
- > Here is the current cabeling picture;
- >
- > /-----\ /-----\ /-----\
- > | VAX | |MICRO| |MICRO|
- > | |12.1 | VAX | 12.2 | VAX | 12.3
- > \--+--/ \--+--/ \--+--/
- > | | LAN 'A' |
- > ----+-------+--------+---------------------+-----+--------
- > | DECNET |
- > | /---+---\
- > /--+---------\ | PC #1 |
- > | PC Running | \-------/
- > | PCBRIDGE |
- > \-------+----/
- > | LAN 'B' IPX, TCP/IP & DECNET
- > <-------+--------+------------------------+----------------->
- > | |IPX = FEEDBFOO
- > /---+---\ /-----+------\
- > | PC #2 | | NetWare |
- > \-------/ |v3.11 Server| "MOTHRA"
- > \-----+------/
- > IPX & TCP/IP | IPX = FEEDBOFF
- > <-----------+----------------------------+------------------>
- > | LAN 'C' Other Netware
- > /---+---\ Servers -->
- > | PC #3 | & LANs
- > \-------/
- >
- > I have connected PC #1 and logged into the NetWare Server MOTHRA
- > with no problem and according to the terminal program (which has a
- > LAT driver) documentatiom I should have no problem logging onto the
- > VAX systems from PC#1 or PC#2. I haven't installed the terminal
- > program yet.
- >
- > BIG QUESTION #1:
- > ----------------
- > How do I get PC #3 to process DECNET packets through the NetWare
- > server MOTHRA. While MOTHRA will pass TCP/IP or IPX I do not think
- > that it will pass DECNET even though it uses 802.3 Ethernet.
- >
- > Must I put some sort of router attaching LAN 'B' and LAN 'C' that will
- > route DECNET packets and keep the LANs withe their respective IPX names?
- > I have put a PCbridge between them but as expected I get Router errors
- > off of the MOTHRA internal router.
-
- First, why are you talking about DECnet all of the sudden? DECnet is not
- LAT, LAT is not DECnet. LAT is a datalink layer protocol. It cannot be
- routed by a network-layer router, but it can be passed by a datalink-layer
- bridge. If you buy LAT terminal servers from DEC, they can booted from
- VMS hosts using DECnet. But that does not apply here in this case, and
- has nothing to do with LAT anyway.
-
- I haven't used PCbridge, but most bridges can be configured to only bridge
- certain datalink layer protocols. Since MOTHRA is routing IPX and IP, if
- you put a bridge between LAN C and LAN B, you should configure it to bridge
- LAT only. Bridging the protocols MOTHRA is already routing between it's
- interfaces will indeed cause severe problems, as you have already observed.
-
- Off to the right you show more NetWare servers and LANs. If your network
- is very extensive, you probably don't really want to bridge LAT everywhere
- if you can avoid it. You might want to think about using Telnet instead.
- If Telnet overhead on the VAXes is an issue, or you cannot get/afford a
- TCP/IP package for your VAXes, you could instead buy a Telnet/LAT terminal
- server and stick it on LAN A. Users could Telnet to the terminal server,
- then connect to the VAXes from there using LAT. Since the terminal server
- is on LAN A, LAT traffic is limited to LAN A, so you don't have to bridge
- it anywhere. Since all your routers already handle IP, any of your PCs
- can reach the terminal server by Telnet. And since the terminal server
- concentrates the terminal session traffic with LAT, the VAXes avoid the
- high interrupt stack and kernel mode time overhead that Telnet can cause.
-
- >[deleted...]
- --
- James Harvey IUPUI OIT Technical Support/Networks
- harvey@iupui.edu harvey@indiana.edu uucp:iugate!harvey bitnet:harvey@indyvax
-