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Exchange 2007 EDGE Server NAT issue

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Exchange 2007 EDGE Server NAT issue - 14.Dec.2007 6:19:51 AM   


Posts: 1
Joined: 14.Dec.2007
Status: offline

I have our 2 Exchange 2007 EDGE Servers published to the internet via ISA Server Array.

The problem is that we have 2 dedicated IP addresses on the external adapter that are assigned to the SMTP Servers. These are VIP's across the NLB array for the ISA's

i.e. &

these are set to point to reverse dns records to return mail1.mydomain.com and mail2.mydomain.com

but the primary NLB addresses are & and VIP (

the problem is when the mail servers relay messages outside the network the address is not nat'd and will come from either edge server but with a source ip of either  73.60.135130 / this in turn does not have a reverse DNS record and the detination SMTP Server will knock back the message with an error

When mail is relayed to us it hit the correct ip address on the server because it is published and we have no problem.

How do i make the outbound initiated connection appear it comes from the correct ip address and not just the phyiscal ip of the adapter that is on the ISA Server.



p.s. posted to isaserver.org as well.
Post #: 1
RE: Exchange 2007 EDGE Server NAT issue - 17.Dec.2007 11:47:42 AM   
John Weber


Posts: 1236
Joined: 20.Apr.2005
From: Portland, Oregon
Status: offline
Get ahold of your ISP that provides your IP space and have them rev ptr both outside IP's to your mx record.


(in reply to TobiR)
Post #: 2

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