[Novalug] determining where a port is blocked

Richard Rognlie rrognlie at gamerz.net
Tue Nov 13 22:25:18 EST 2007


> Looks like only port 22 is allowed into the verizon network and to my
> box.
>
> Is there a way to figure out when a packet is blocked for a port while
> transversing the network?
>
> I don't want to run imaps on port 22 b/c I need/want shell access and
> forwarding...

Traceroute?

/usr/sbin/traceroute [-n] -P tcp -p 143 targetip


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