firewall IP as Originating IP for emails

[Steve Cowles]

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On Stardate 6609.08, Mrs. Geeta Thanu said:

| Hi Greshko,
|
| Yah! what you are saying is correct I think.
|
| I will just type the reason given by the domain which rejected our mail
| ----------------------------------------------------
| bala at reametrix.com Permanent error involving remote host.
| 554 5.7.1 The server sending your mail[210.212.212.2] does not have a
| reverse DNS entry.connection rejected.Please conatct your network ISP
| provider.Default reject!
| -------------------------------------------------
| here the IP 210.212.212.2 is our firewall IP
| and   the mail+web+DNS server IP is 210.212.212.3 which is natted in the
| firewall to a local IP.
|
| Please help me to solve this problem.
|

After re-reading the above, it looks like the OP may be asking about
howto implement something like one-to-one NAT or a proxyarp type
configuration at the firewall. This in addition to the DNS problems
problems already mentioned.

A good starting point at understanding one-to-one NAT can be found by
reading: http://shorewall.net/1.4/NAT.htm

There are many other helpful links at shorewall.net regarding this
topic. Search for "proxyarp"

- --
Steve Cowles
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