Blocked port 25? -- problem discovered, thanks!

Thu Aug 19 14:27:33 UTC 2004

Thanks for everyones help and good information.  The problem has been 
discovered and a solution is pending.

NMSU peers with UNM, and we provide backup Internet routing for each 
other.  UNM is in the process of adding Time Warner Telecom as a peer, 
and they are not advertising NMSU's routes correctly.  The result is 
that all customers connected to Time Warner Telecom are using UNM as a 
transit to get to NMSU.  UNM also has a filter on their border router 
to prevent access to unauthorized SMTP servers, and this affectively 
blocked the Time Warner Telecom to NMSU mail traffic.

I am presently working with the UNM engineers to fix this problem.  I 
didn't see the Time Warner Telecom correlation in my traceroutes, 
because many of the places were multihomed, and the traffic from NMSU 
was taking a different ingress into their network.

It would seem that my byronhicks at byronhicks.com email is broken, too.  
It would appear that I let my domain expire, and the email address I 
have on record with Network Solutions is not longer valid.  bleah..  
Too early in the morning to have to deal with this stuff.

Thanks again to all the NANOG members that helped me quickly diagnose 
this problem.

--
Byron L. Hicks
Network Engineer
NMSU ICT

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