[KLUG Members] Iptables

[Bruce Smith]

> > > While I was searing for solution to restrict users from accessing msn
> and
> > > yahoo messenger I found following mail describing it using iptables. I
> want
> > > to know why all rules are implemented in forward chain
> >
> > Probably because that's the chain the packets transverse!   :-)
> > (it's a network firewall, not a single workstation running iptables)
> >
> > It sounds like you need to understand more how netfilter (iptables) and
> > the chains work.  The graphic here is what helped me understand it:
> >
> >   http://www.knowplace.org/netfilter/syntax.html
> 
> All right! But do you think syntax and method to implement it correct?

I've never tried blocking the instant messenger services.
Why don't you just try it and see if it works?

 - BS