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Author Topic: IP Changed on internal host (Exchange)  (Read 8511 times)
patrickdoman
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« on: Wednesday 06 August 2014, 03:02:00 pm »

The IP address that my exchange server was using has altered to another external IP address from a different device.

mail.companyname.com pings to the correct IP address, but on the Endian I am not able to figure out how to get the system to show up as another IP address than it is using right now.

I have a main uplink using 23.23.23.23
I have a WAN2 uplink using 72.1.1.1

Both interfaces are up.

When I rebooted the Endian this morning to troubleshoot an issue on the firewall, I saw that the external IP of the Exchange server changed from 72.1.1.1 to 23.23.23.23.

Because of this IP change, mail flow now is not coming in from outside.

I think port 25 traffic is potentially being blocked.

Outbound mail flow is fine. No issues there.
Inbound just isn't working.

When I telnet to the 72.1.1.1 port 25, eventually I get a connected message.

But if I do a what is my ip lookup, th ehost shows its using 23.23.23.23 and I need it to be seen as 72.1.1.1.

Where can I look to fix this? I am not sure what happened during reboot.
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