I just spent several hours attempting to set my outbound SMTP traffic from Exchange 2007 to use a specific IP on my ISA Server 2006 external NIC of the 5 available. I wanted to isolate mail traffic to a specific IP address. However, it turns out that you cannot send traffic over a specific IP in ISA 2006 for any protocol, unless you install another NIC with the IP address that you want to send on. Here is a blurb that was posted by someone on Experts-Exchange after they spoke with Microsoft support on this issue (Not linking since you won’t be able to see the link):
'No version of ISA can, to date, select the IP address that will be used for outbound NAT addressing - only inbound as I have mentioned before. This facility WILL be introduced in ISA 2008 either in the beta release or in the full version. Yes, you can use an additional NIC with a public IP and route mail through that connector but long term, this is not a scaleable option'.
1 comments:
That is correct, my friend of mine told me you cannot do it without installing another NIC with the IP address, he tried many times without success, that's the only way he knew.
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