Quoting Conor Wynne (weeboy at conorwynne.com):
> On Fri, 2004-12-03 at 17:22, John P. Looney wrote:
>> > Except piss people off that try and debug network problems.
>> Eh, wot?
>> For example:
> telnet ipaddress 25
>> Would verify that SMTP is open through a firewall. Same goes for any
> service you are trying to debug.
Very occasionally, I'll be trying to debug someone's connectivity, be
right on the brink of declaring his link broken at the border router, and,
just on a cynical suspicion, will attempt tcptraceroute instead of regular
(ICMP-based) traceroute -- which thereupon works fine.
And thus it belatedly becomes clear that some idiot decided to block
ICMP using netfilter rules or similar, and forgot to inform the sap
technician (me) whose time was thereby wasted and primary toolkit
Maintained by the ILUG website team. The aim of Linux.ie is to
support and help commercial and private users of Linux in Ireland. You can
display ILUG news in your own webpages, read backend
information to find out how. Networking services kindly provided by HEAnet, server kindly donated by
Dell. Linux is a trademark of Linus Torvalds,
used with permission. No penguins were harmed in the production or maintenance
of this highly praised website. Looking for the
Indian Linux Users' Group? Try here. If you've read all this and aren't a lawyer: you should be!