[OT] Routing?

[phil]

(I'm asking this here just because I suspect there are readers with 
network administration smarts.)

I have a DSL connection via IStop.  My wife has a Rogers cable 
connection.  Her e-mail provider is a different ISP altogether.

When she connects her laptop using cable, POP works and SMTP times out, 
both using the same host.  Connecting the same laptop using DSL has 
both services working fine.  If I telnet port 25, it works on DSL and 
times out on cable.  The host name resolves to the same IP address 
regardless of which network connection.

This is a new development, starting over the past few days.

I'm baffled at the idea that a particular port responds or not, 
depending on the source address or network.  (I know some providers 
shut down SMTP from outside their network, but in this case: providing 
3rd-party mail is part of their business, there's no error message, and 
it's strangely selective.)

Any suggestions of what might be going on (before we call various tech 
supports and grovel)?

........................
Phillip Mills
Multi-platform software development
(416) 224-0714

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