[OT] Routing?

James Knott james.knott-bJEeYj9oJeDQT0dZR+AlfA at public.gmane.org
Mon Jun 27 13:17:21 UTC 2005


phil wrote:
> (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)?

Many ISPs block external smtp connections, to reduce the possibility of
spamming.  Again some will allow external connections, via a secure
connection, such as ssl or ssh.

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