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6.6

ISA Server external IP problem

Asked by mortimer452 in MS Forefront-ISA, Web Hosting, Network Software Firewalls

Tags: isa, ip, external, server

I need some help with Microsoft ISA Server 2004.  I have an ISA 2004 box running as strictly a firewall to protect an internal network.  We're using server publishing rules to publish two mail servers (I'll call them MailA and MailB) and a dozen or so other rules to publish various other machines (couple web servers, SQL, etc.).  

The external NIC on the ISA server has 20 IP's assigned, the two publishing rules for MailA and MailB are listening on different IP addresses for ports 25 & 110 to serve SMTP and POP3 requests.

The mail servers both work fine, the problem is outgoing connections.  When MailA and MailB connect to the outside world, they both appear to come from the same IP address, which is the default external address for the ISA server, not the IP address that is configured in the publishing rule.  In fact, anything behind the firewall always "appears" to the outside world as the ISA server's default external IP, regardless what any publishing rules might say.

This is causing problems with our mail servers because one of them gets blacklisted, and as a result the rest of our mail servers are blacklisted because they all appear to come from the same IP.  Is there a way to configure ISA server to send outbound traffic with different IP's from the external network?

[+][-]07/25/07 10:58 PM, ID: 19572157Expert Comment

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[+][-]07/26/07 10:43 AM, ID: 19576552Expert Comment

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[+][-]07/28/07 02:42 PM, ID: 19586152Accepted Solution

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About this solution

Zones: MS Forefront-ISA, Web Hosting, Network Software Firewalls
Tags: isa, ip, external, server
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Solution Provided By: keith_alabaster
Participating Experts: 2
Solution Grade: A
 
[+][-]07/28/07 10:10 PM, ID: 19587092Author Comment

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[+][-]07/29/07 01:09 AM, ID: 19587373Expert Comment

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[+][-]07/29/07 02:58 AM, ID: 19587550Expert Comment

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