Re: Reflexive firewalls?

[korozion <korozion () koroded net>]

I believe this is a basic form of Port Knocking, and there are ways to 
do it with IPTables.  portknocking.org might be a place to start.

Danilo Chilene wrote:
> I know how do this with PF.
>
> Don't have any idea with iptables. :(
>
> Ong Chin Kiat wrote:
> > Hi list,
> >
> > I've recently used an SSH server that had an interesting
> > authentication mechanism. You first had to telnet to the machine on a
> > certain port. After doing this (it will just time out - no prompt),
> > you then SSH to the server in question. The telnet step has to be
> > carried out, if not SSH will just time out.
> >
> > My question is, is this called reflexive firewalling, and can I
> > duplicate this with iptables?
> >
> > Thanks.