Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

I have been trying to fix this problem for a week now. My network has 2 ISP:

1: fixed IP -> Billion router -> mail and web servers
2: dynamic IP -> Linksys -> normal web browsing

They all used to work flawlessly until I reset the routers a week ago (following an advice by ISP to fix a problem). Until now I can make everything work except receiving mails from outside domains.

Billion - DHCP (192.168.2.1) is turned off. Virtual servers in NAT page set to corresponding server local IPs.

Linksys - DHCP (192.168.2.2) is set to relay to 192.168.2.101 (I don't know why. It was set by former admin who quits 2 months ago) Single Port Forwarding was set like before.

Here is the DNS setting in DNS-DIY:

(blank) - A - (global IP)
* - A - (global IP)
www - A - (global IP)
(blank) - MX - mail
mail - MX - (global IP)

Telnetting the local IP and mail.xxxx.com for 110 and 25 works, but xxxx.com doesn't.

Another thing I can tell is two routers are connected in some way. I don't know about details of the mail server. I am just a programmer and completely new to this network stuff. Even the network admin who quits 2 months ago cannot figure this out.

This issue is critical to the company I am working, so I need this fixed ASAP. I will provide any more information I can.

share|improve this question
add comment

1 Answer

Sorry for answering my own question, but I just figured a way.

At first I changed all the DNS settings to Linksys (dynamic IP). E-mail works well but this is not a permanent solution.

The mail server appears to be Ubuntu OS of some kind. I searched for command lines on Google and found out its default gateway is 192.168.2.2

So I set it to 192.168.2.1 (fixed IP router) and now we can use the E-mail normally.

I don't know if there will be any more problems because of this change though.

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.