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Re: [OCLUG-Tech] ports

Hi James.  Can you do a $ telnet [destination] 25
from the other lan to the machine?  If you can, then at least it
shouldn't be a network firewall issue.  If not, can you ping the mail
machine from the other lan?  If not, perhaps you have a routing
problem.  Also, you may have smtp configured such that it only pays
attention to lan connection requests, although that is less likely.

-Steve


On 08/19/2012 05:11 PM, James wrote:
> Both computers run Linux.
>
> A port scan of the machine with the open port 25 from inside the same lan.
>
> PORT   STATE SERVICE
> 25/tcp open  smtp
>
> port scan from the web
> port 25 is open
>
> port 25 can receive mail.
>
> A port scan of the machine with the open port 25 from my lan.
> PORT   STATE    SERVICE
> 25/tcp filtered smtp
> I can't telnet to port 25 of the computer on the other lan so it is hard to debug it.
> I tried making this computer a DMZ.
>
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