IGNITe/400 Mailing List Archive Entry
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All,

I have an interesting multi-homing situation that I could use some help
resolving.

I have an S10 server that has a Token Ring and Ethernet Adapter. The TR
side is connected to a lan/wan and the Ethernet side is connected to a DMZ
segment with the Internet router and a firewall (which restricts user access
between the lan/wan and the internet).

The S10 runs three webservers, SMTP, & POP. The webservers are configured
to run on ports 80, 8081, and 81 respectively. We are using 141.11.20.58 as
the IP for the token ring and 156.96.80.4 as the IP for the Ethernet. Since
NONE of our servers are multi-homed, an internal user can access the web
servers via 141.11.20.58 and an external internet user knows the server as
156.96.80.4. Since none of the servers are multi-homed, we have had no
problem with this configuration.

Now, the problem. We now have a need to host another site with a new domain
name which must map to a new IP address. Public address: 156.96.80.70.

As I see it, if I turn on multi-homing (I/Net Commerce Server/400) and BIND
SPECIFIC on IBM's HTTP server then the server will bind to the port its
been told to bind to on the IP address that it finds a) in the AS/400's host
names table, or DNS.

This means that if the server finds the 141.. the server will bind to that
address and my INTRANET folks will be extremely happy, but my INTERNET folks
will be extremely unhappy since the 156.. address would not be bound to
anything.

I am thinking that I have two possible solutions to my woes here:

1) Move the AS/400 behind the firewall (not a great idea IMHO) and use
Network Address Translation on the firewall to with the AS/400 knowing only
the internal IP addresses. I've done this an I know it works, but the AS/400
then is dependent on a pc based firewall. The whole site crashes and burns
when the PC or IPCS card fails.

2) Enable the new NAT support on V4R3 and see if the 156.. address can be
translated to the 141 so that the servers are all associated with the 141...
internal addresses which will in the future become 10...

3) Use the firewall's NAT support so that 156 traffic is translated to
141... equivelents and routed to the 400 which only knows 141 addresses?

Option 3 is the easiest, has anyone tried option 2 using the native OS/400
NAT support in V4R3?

Bob C.


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