How do I force SMTP through specific IP on my router?

CubbyFifi · Aug 30, 2010

I have a block of IP addresses assigned to my location from my ISP and I use a CISCO 1800 series router.

I need help in setting up the router to force all SMTP traffic from my Exchange server through a particular IP address.

For example: 1.2.3.4 is the primary static IP and my block is 5.6.7.8-10. I want to force traffic from my Exchange server on 192.168.0.x through IP 5.6.7.9.

I know there is a way to do it but everything I have tried so far has failed.

I'm sorry if this has already been discussed but all of the threads I have looked at to date have not given me the information I need for my specific scenario.

Thanks in advance for your help.

kwing112000 · Aug 30, 2010

You may get better results in the cisco router forum.

http://www.tek-tips.com/threadminder.cfm?pid=557

Kevin Wing
ACSS Small and Medium Enterprise (SME) Communications
ACS- Implement IP Office
ACA- Implement IP Office
Carousel Industries

VinceWhirlwind · Aug 30, 2010

Surely the exchange server should have the SMTP routes configured to take care of this?

Noway2 · Aug 31, 2010

The Cisco routers may be designed for a more advanced configuration than this, but it sounds like you want simple port forwarding. This is a feature very common on 'home' routers where a port (SMTP:25) in this case from a particular IP always gets forwarded to a dedicated LAN IP. Not sure how to set this up in your devices as I am still a total novice to IOS.

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How do I force SMTP through specific IP on my router?

CubbyFifi

IS-IT--Management

kwing112000

Vendor

VinceWhirlwind

Technical User

Noway2

Programmer

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