Path: utzoo!attcan!uunet!samsung!sdd.hp.com!ucsd!ucbvax!VAX.FTP.COM!jbvb
From: jbvb@VAX.FTP.COM (James Van Bokkelen)
Newsgroups: comp.protocols.tcp-ip.ibmpc
Subject: Re: Two TCP/IP stacks on one PC
Message-ID: <9005301417.AA12410@vax.ftp.com>
Date: 30 May 90 14:17:42 GMT
References: <9005300317.AA12582@alw.nih.gov>
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 45

Given prior discussion of XNS Netbios vs. TCP Netbios as presently widely
available (B-nodes only), it seems that the only satisfactory solution
for your site is to keep XNS for 3+Open, and use TCP/IP side-by-side over
an NDIS driver of your choice:

	NDIS			(NDIS provides the demultiplexing)
       /    \
  TCP/IP   3+Open
  kernel    (XNS)

This solution gives you your choice of TCP/IPs under both DOS and
OS/2.  Under DOS you can chose any TCP/IP that supports NDIS: PC/TCP,
WIN/PC, PC-NFS, BW-NFS, or the 3Com product.  Under OS/2, all the
available TCP/IPs support NDIS, except for some of those that run
on 'smart' boards.

If B-node RFC 1101/1002 support is viable in your environment, or the
vendor you like can supply either M-Nodes or a static name exporter on
the lines of 3Com's 'locator', the multiplexing can take place above
TCP/IP, as follows:

	NDIS			(actually, since NDIS isn't being used to
	  |			 demux anything, it isn't required and you
	TCP/IP			 could use a Packet Driver, a linked-in
	kernel			 driver or a smart board instead)
       /      \
   Telnet,    Netbios
   FTP, etc.  (RFC 1001)
	     /		\
	3+Open/LM    Other Netbios apps

On DOS, this scenario lets you use any of the vendors who supply an
RFC 1001/1002 Netbios.  On OS/2, your choices are more limited,
because only Excelan and 3Com have so far offered the requisite
kernel-resident Netbios implementation.  We intend to, but NFS has
priority.

The only work I have ever heard of that ran two TCP/IP stacks on a
single machine was done under DOS at a university that wanted the RVD
support in PCIP to run alongside NCSA Telnet, and they recently went
to some effort to replace it with a cleaner solution that only loads
one TCP/IP.

James B. VanBokkelen		26 Princess St., Wakefield, MA  01880
FTP Software Inc.		voice: (617) 246-0900  fax: (617) 246-0901