• Subject: AS/400 NAT
  • From: bobc@xxxxxxxxxxxxx
  • Date: Thu, 15 Jul 1999 07:35:21 -0700
  • Importance: Normal

Some of you may have read my article on configuring the NAT at www.ignite400.org in the Evelyn Porter Institute section of the web site, tried it out, and had
difficulties.  I sent several hours with the NAT developer over the past couple of days and the issues are routing.
Assume the following:
You are mapping a public address defined to the AS/400 via an Ethernet adapter to a private address defined on a token ring
adapter.  You configure an IBM HTTP Server with bind specific=YES on
You then define mapping rules as I illustrated in the article and enable the NAT.
You can't access your web server.
The issue is now a routing issue.  This is what is going on.
1.  An IP packet comes in to the machine via the internet from say  addressed to
2.  The NAT intercepts the packet and changes the TO address from to
3.  The HTTP server gets the request and processes.
4.  The HTTP server formats the request and sends it to
IF you do not have a route defined on your AS/400 to your public Internet router, the packet gets stuffed in the big bit bucket in the SKY!
You must define a default route pointing to your Internet router for this to work.  You then need subnet routes pointing to your internal LAN router
so that your internal traffic (on the 10... subnet) is routed properly.  Once the routing is worked out NAT works like a dream!

Bob C.
Visit http://www.ignite400.org for free AS/400 Internet Information
Visit http://search.ignite400.org for the first and only AS/400 powered
search engine on the internet.


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