[KLUG Members] Iptables

[Adam Tauno Williams]

> >I've never tried blocking the instant messenger services.
> >Why don't you just try it and see if it works?
> Trying to block some of these can get tricky, since they can
> be configured to use http and https for their operation. I'm
> sure some network administrators can get away with blocking
> these, but I haven't met one recently.

Yep, they are basically unstoppable without breaking basic
functionality.  I've yet to see a reliable way of smacking these
parasitic services.

> Some IM's may also run on more or less arbitrary ports...

Yep.