Solved

Dual Homed Mail Server recieves mail on WAN sends back out through LAN

Posted on 2004-08-18
2
348 Views
Last Modified: 2013-12-19
I have an exchange 2003 server... dual homed (two NICS) ...one IP for LAN and one for WAN through pix fw....

I can send and recieve mail fine, the weird thing is that when the smtp server sends out mail to external addresses...it doesnt use the WAN IP I have designated for the exchange server...it routes outgoing messages through the LAN (Internal IP) and out through the gateway...

The LAN NIC is built into MOBO and the WAN NIC is a pci card...dont think this is issue, but becuase LAN NIC is on MOBO, does it default to that NIC first for outgoing TCP packets?

any help would be awesome...
0
Comment
Question by:eseyfried
2 Comments
 
LVL 23

Accepted Solution

by:
rhandels earned 500 total points
ID: 11838475
Hi,

You can set the properties on what NIC has priority, here's how to..

1. Go to the server and open the Network properties.
2. In network properties, go to advanced
3. In the advanced menu choose Advanced Options
4. Make sure that the Internet connection is last in line at the connections box (you can change properties by using the green arrows next to the box).

You could also go to the WAN NIC and make sure that the default gateway is only set on this NIC and make sure it is the ip address of the WAN NIC.

Still i wouldn't use a multihomed Exchange server. You'd better make sure that the Exchange server has one NIC, and that you're router NAT's the external ip addresses port 25 to the internal address of the Exchange server. This is also safer for your Exchange server.
0
 

Author Comment

by:eseyfried
ID: 11845024
right on...thanks...my machine is dual homed   192.168.0  addy and a 192.168.1 addy which is static mapped to WAN IP through the PIX Firewall.

All I did was move the WAN connection up to the top, and took off default gateway on the LAN NIC...

thanks alot
0

Featured Post

Free learning courses: Active Directory Deep Dive

Get a firm grasp on your IT environment when you learn Active Directory best practices with Veeam! Watch all, or choose any amount, of this three-part webinar series to improve your skills. From the basics to virtualization and backup, we got you covered.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Nslookup is a command line driven utility supplied as part of most Windows operating systems that can reveal information related to domain names and the Internet Protocol (IP) addresses associated with them. In simple terms, it is a tool that can …
Have you ever set up your wireless router at home or in the office to find that you little pop-up bubble in the bottom right-hand corner of Windows read "IP Conflict - One of more computers on the network have been assigned the following IP address"…
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…

828 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question