SNA over IP communication

Hi gang,

Sorry for the long post, 
but this is a matter that bothers me for a long time now.

Currently we have 2 routers for our outgoing communication :
one to the AT&T- and the other one to the GlobalOne-network.
All communications over the AT&T-network are migrated one at 
the time to the GlobalOne-network.
TCP/IP is almost never a problem , the real pain starts when 
the SNA ( encapsulated ) needs to be migrated.

My big question is : where is the relation defined between the 
SNA definitions and the IP-address ?
Depending on the source , I get following answers :
1) That relation must be manually entered in the router.
2) That should be done on the AS/400.
3) Nothing, it's automatically taken care of.
4) No clue ( most popular one :-( )

The first answer was given to me by Software Support from IBM.
Having a lot of faith in that person, 
I assumed that his answer was the correct one.
But, today one of our partners ( using both AT&T and GlobalOne )
had to replace their Ethernet-card.
Because they have now a different MAC-address,
I assumed that the routers needed some manual re-configuration.
Guess what, after the other parties changed the MAC-addres
in their controller, all communication was up and running again ?

Does somebody knows where and how the SNA-IP relation is made
and if there is a possibility on the AS/400 to check which
SNA connection is using which router ?
Is there a difference between Tokenring/Ethernet over IP ?

Using the DSPAPPNINF-command, I can see which SNA-connection are 
currently active. 
For migrated connections that are not working, I still 
have the indication that the system has valid routing information.
( link active = no ). What is this information worth ?

These are a lot of questions I know,
still I hope that some one of you can provide me some answers.



Many thanks in advance


Chris

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