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- From: klitd@hpsgm2.sgp.hp.com (Raj PUBALA)
- Date: Sat, 12 Sep 1992 16:06:26 GMT
- Subject: Re: How to interconnect a LAN ?
- Message-ID: <72810001@hpsgm2.sgp.hp.com>
- Organization: HP Singapore Notes-Server
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!rpi!usc!sdd.hp.com!scd.hp.com!hplextra!hpcc05!hpsgm2!klitd
- Newsgroups: comp.dcom.lans.misc
- References: <1992Sep5.111417.28584@htsa.aha.nl>
- Lines: 158
-
- In comp.dcom.lans.misc, tsjoit@htsa.aha.nl (T. H. Tsim) writes:
-
-
- Dear netters,
-
- I am looking for comments for this problem:
-
- I want to connect a LAN of PC's with a remote SCO Unix Host:
- The Lan is working with Novell's Netware.
-
- W -|
- |
- W -|
- |
- W -|-H--^........^--Unix
- |
- W -| W=workstation
- | H=Novellserver
- W -| U=SCO Unix
-
- I was thinking of using two bridges (but I don't have experience with bridges)
- in order to 'bridge' the distance through x.25 or leased line. Could someone
- give me some usefull hints ?
-
- The second part I'm not familiar to is how to connect the workstations with
- the Unix-Host, after a lot of thinking, browsing and studying, I think TCP/IP
- could be a good solution.
-
- But again, I lack of practical knowledge, in order to enable coexistance of
- IPX and TCP/IP. I've heard of ODI-drivers, packet-drivers,machine requirements,
- SLIP and PPP. After a lot of studying documents and books, I still can't see
- the whole picture of the puzzle (maybe some pieces are missing ?)
-
- So please, give me some comments, critics, information to indicate I'm one the
- right track (or not).
-
- I'm a student on co-op assignment :-)
-
-
- Greetings from Holland
-
-
- When you are connecting the remote SCO UNIX server to the novell LAN,
- it really depends on what you want to do. If you are just interested in
- application access on the SCO UNIX (i.e. accessing an application on the
- SCO Unix through terminal emulation) from the PCs on the LAN, then a
- asynchronous gateway or an X.25 gateway will suffice. There are many
- products that can do these (e.g:- EICON gateway, Novell has their own too!).
- If you are using X.25 gateway, make sure you have X.25 an HPAD support
- on the SCO Unix host.
-
- Of course you can achieve the above functionality through TCP/IP by
- employing bridging or IP routing (dedicated/non-dedicated). You may find
- them a more expensive approach (telecommunication requirement is higher,
- etc).
-
- However, if requirement dedictates that you need file services integration
- between the Netware server and SCO Unix server and printing services
- integration, then you will need to use a bridge or router.
-
- To do the above, you can use NFS NLM on the Netware server (I presume it
- is a 3.11 Netware version) and run NFS on the SCO Unix. This will allow
- file sharing and access by both Netware clients (PCs) and SCO Unix users.
- Netware users on the LAN can access the files on the SCO Unix transparently
- (they don't see NFS, they see them as part of Netware volume). likewise,
- SCO Unix see Netware volumes as NFS volumes). Integration of the print
- services can be done through a third party product (I think it is reflex?
- I can't remember the name). Basically, it uses the "lpr" to support remote
- spooling. And SCO Unix does support "lpr". Now all these only concern
- integration of services and nothing about bridging or routing.
-
- To interconnect the two networks, you can use bridges. Please take note
- of your briges capability. You want to minimise non-TCP/IP packets from
- going over to the SCO Unix Network. Netware (i.e. IPX packets). If you
- are using bridges, make sure that you have sufficient filtering
- capability to stop IPX traffic from going to the SCO Unix host.
-
- Dedicated routers are an alternative to bridging but they can be expensive
- for your simple application. You can turn the Netware server (3.11 I
- presumed) into a non-dedicated IP router and use bridging on the IP
- segment of the Netware Server. If you application requirement is of
- high traffic in nature, then this can be hindrance to your netware server
- performance. In that case, you use a dedicated IP router.
-
- As for TCP/IP software on the PCs, you can use LAN WorkPlace from Novell
- (they use ODI) or ARPA for Netware (from HP, they use NDIS). Both allow
- IPX and TCP/IP protocol stacks to coexits on the same LAN card. You may
- want to check out the support for your existing LAN cards.
-
- PC
- |
- PC (terminal emulation)
- |
- PC
- |
- |
- Netware Server
- |
- |
- X.25 Gateway <-----X.25 Network--------> SCO UNIX
-
-
- (X.25 Gateway Approach - terminal access only)
-
-
- PC
- |
- PC (Can also run PC/NFS, independent of Netware Server)
- |
- PC (runnning LAN WorkPlace)
- |
- |
- Netware Server (running NFS, TCP/IP)
- |
- |
- Bridge<-------------------------->Bridge----SCO UNIX (TCP/IP,NFS)
- (Filter off IPX packets)
-
- (Bridge Approach 1)
-
-
- PC
- |
- PC
- |
- PC (running LAN WorkPlace)
- |
- |
- Netware Server (running NFS, TCP/IP routing turned on)
- |
- |
- Bridge <----------->Bridge-----SCO UNIX (TCP/IP, NFS)
-
-
-
- PC
- |
- PC
- |
- PC
- |
- |
- Netware Server
- |
- |
- IP Router <--------------> IP Router-----SCO UNIX (TCP/IP,NFS)
-
-
- (Dedicated Router Approach)
-
-
- I hope you will find these helpful. Please note the opinions expressed is
- my own and is independent of my employer.
-
- Regards,
-
- David LEE
-
-