• RSS
  • Twitter
  • FaceBook

Welcome to ISAserver.org

Forums | Register | Login | My Profile | Inbox | RSS RSS icon | My Subscription | My Forums | Address Book | Member List | Search | FAQ | Ticket List | Log Out

Mail Server Publish - Returned Traffic on wrong IP

Users viewing this topic: none

Logged in as: Guest
  Printable Version
All Forums >> [ISA Server 2000 General] >> Server Publishing >> Mail Server Publish - Returned Traffic on wrong IP Page: [1]
Login
Message << Older Topic   Newer Topic >>
Mail Server Publish - Returned Traffic on wrong IP - 14.Feb.2004 2:30:00 PM   
todmadderra

 

Posts: 2
Joined: 9.Jun.2003
From: Atlanta, Ga
Status: offline
I have a single external interface with multiple IPs bound to it. I am using one of the "additional" IPs on the external interface to publish my mail server. The publishing works fine with the exception that all outbound SMTP packets are going out on the "primary" IP and not the one that I have the server publishing configured for. This is a problem since many are using reverse DNS lookups and are rejecting mail we send out.

I have deleted the publishing rules, rebuilt the LAT, and republished with no change.

Anyone have any thoughts on how to force outgoing SMTP to send on the "additional" IP?
Post #: 1
RE: Mail Server Publish - Returned Traffic on wrong IP - 14.Feb.2004 4:03:00 PM   
spouseele

 

Posts: 12830
Joined: 1.Jun.2001
From: Belgium
Status: offline
Hi todmadderra,

by design, all outbound traffic is sourced from the primary IP address assigned to the ISA external interface. You simply can't change that behaviour. So, it is strongly adviced to publish your internal mailserver on the primary IP address.

HTH,
Stefaan

(in reply to todmadderra)
Post #: 2
RE: Mail Server Publish - Returned Traffic on wrong IP - 15.Feb.2004 5:58:00 PM   
todmadderra

 

Posts: 2
Joined: 9.Jun.2003
From: Atlanta, Ga
Status: offline
Thanks for your confirmation on what was happening. I had to simply shuffle my IPs around as none of the other functions were so dependent upon outbound address. JOC, how is one to publish multiple mail servers behind ISA and provide reverse DNS lookup support if the external NIC will always "send" data out on the primary IP?

Thanks,
TM

(in reply to todmadderra)
Post #: 3
RE: Mail Server Publish - Returned Traffic on wrong IP - 16.Feb.2004 7:50:00 AM   
jmunyan

 

Posts: 803
Joined: 3.Feb.2001
From: Seattle, WA
Status: offline
I got nailed by this myself a while back. Though I didn't implement this solution myself it would seem your most likely solution would be to use a smart host to concentrate the mail flow from the multiple servers before flowing the mail out through isa. If this solution doesn't scale to your needs I think you are out of luck.

Thanks,

John

(in reply to todmadderra)
Post #: 4
RE: Mail Server Publish - Returned Traffic on wrong IP - 16.Feb.2004 8:42:00 PM   
spouseele

 

Posts: 12830
Joined: 1.Jun.2001
From: Belgium
Status: offline
Hi todmadderra,

good to hear you have it working! [Smile]

If you need to publish multiple internal mail servers and must be sure that the same IP address is used for the outbound mail too, setup a secure mail relay and publish this one instead of each individual mail server. The secure mail relay server is then responsible for routing all inbound mail to the correct internal mail server.

HTH,
Stefaan

(in reply to todmadderra)
Post #: 5

Page:   [1] << Older Topic    Newer Topic >>
All Forums >> [ISA Server 2000 General] >> Server Publishing >> Mail Server Publish - Returned Traffic on wrong IP Page: [1]
Jump to:

New Messages No New Messages
Hot Topic w/ New Messages Hot Topic w/o New Messages
Locked w/ New Messages Locked w/o New Messages
 Post New Thread
 Reply to Message
 Post New Poll
 Submit Vote
 Delete My Own Post
 Delete My Own Thread
 Rate Posts