I'm using RH7. I have a problem accessing our mail server which has an external IP. Had no such problems when I assigned it an internal IP. Anyone else have this problem.

Hmm. Could use a little more info about that. How many PCs do you have? Do you have a firewall between you and your mail server? Is the firewall and the mail server the same machine?

I'm assigned an IP using dhcp. I'm able to access the mail server from windows, but can't access it when I boot up in linux.

We have 100+ pcs on the network. Yes there is a firewall b/w my linux m/c and the mail server. We are using ipchains.
The firewall is not the same m/c as the mail server.
Our main server has IP - 192.168.1.2 and acts as the firewall. The mail server is outside the firewall. I tried assigning an IP 192.168.1.1 and it worked fine

Thanks,
Shankar

If your PC works with Windows but not when you load Linux on it, then that pretty much limits it to the Linux configuration on the PC. The first thing that I would check is that your Linux PC is picking up the proper gateway address from DHCP and not using something that is written in a file somewhere instead. Check /etc/sysconfig/network and see if there is a gateway set there. Also check /etc/sysconfig/network-scripts/ifcfg-eth0 to make sure that DHCP is enabled. Let me know if that helps....

-Mark

DHCP is configured ok. I tried a route -n and the gateway is 192.168.1.2 which is correct. What else should I check.

Thanks,
Shankar

Hmm, I'm running out of ideas here. The last thing I can think of would be a DNS problem. Look at what your PC is using for a name server in windows and make sure it's the same in Linux.

Maybe someone else can shed some light here. I must be missing something.

--Sorry!
-Mark

This is really odd. The only thing i can think of is to run an ifconfig -a to make sure that all your interfaces are plumbed and enabled.

The only thing being odd is that it works with windows, but not with Linux. To me, this means the problem is with the PC and not the firewall...