RE: SNA OVER TCP/IP

I am not sure I understand what you mean.
If you use some kind of TCP/IP-based tunnelling (eg VPN), this will be
entirely transparent to SNA over TCP.
And the same tunnel, if it's two-way, will be used for SNA connections both
ways.
You only need to setup TCP/IP, IP addressed, routes etc.

SNA over TCP by itself does not create a tunnel.
When you request SNA session to SNA LU (aka remote location), system picks
up SNA address to IP address mapping and asks TCP/IP stack to connect to IP
address. Form this point on it's pure TCP/IP - until it reaches target
system, where SNA over TCP will take over again. So all TCP/IP techniques
apply.

    Alexei Pytel



"Brendan Bispham" <midrangel@black-and-blue.com>@midrange.com on 10/11/2000
07:36:19 AM

Please respond to MIDRANGE-L@midrange.com

Sent by:  owner-midrange-l@midrange.com


To:   <MIDRANGE-L@midrange.com>
cc:
Subject:  RE: SNA OVER TCP/IP



Thanks, that fits the facts... but is the concept of a 'tunnel' applicable
here? I.e. would point-to-point tunnelling simulate a PtP connection and
allow 2-way link?


> > The AS400 with the restrictive ISP makes an SNA connection over a
single
> > port. Passthrough, DDM etc work fine. The link is kept open, and the
> other
> > AS400 can use the 'open' SNA connection to passthrough back.
>
> There is no "link" for SNA over TCP/IP. Every session will establish it's
> own connection to remote system.
>
> Alexei Pytel

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