On Fri, Dec 03, 2004 at 07:01:09PM +0000, Conor Wynne mentioned:
> Eh, wot?
> For example:
> telnet ipaddress 25
>> Would verify that SMTP is open trough a firewall. Same goes for any
> service you are trying to debug.
What if some services work fine, but some don't ? Or no services work,
except ones to specific IPs ? There is so much wierd shit that can happen
to stop a network connection working - machines with duplicate MAC
addresses, dodgy network cables, connection tracking tables, incorrect NAT
setup, morons blocking broadcast packets on a firewall etc. Relying on
layer4 stuff to debug lower level problems is a bad bad idea.
John
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