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RE: Reflexive firewalls?
From: "Jason M. Beauford" <jbeauford () subropartners com>
Date: Thu, 27 Dec 2007 14:22:19 -0500

Port triggering, or Port Knocking.

heres the first url I found:

Multiple-port knocking Netfilter/IPtables only implementation


-----Original Message-----
From: Tom Corelis [mailto:tomc () targetbilling com] 
Sent: Thursday, December 27, 2007 12:41 PM
To: security-basics () securityfocus com
Subject: RE: Reflexive firewalls?

Would this be called port triggering? I've seen a few commercial router
boxes that support that feature, though I've never looked into it



-----Original Message-----
From: listbounce () securityfocus com [mailto:listbounce () securityfocus com]
On Behalf Of Danilo Chilene
Sent: Thursday, December 27, 2007 10:03 AM
To: Ong Chin Kiat
Cc: security-basics () securityfocus com
Subject: Re: Reflexive firewalls?

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?


Danilo F. Chilene

Especialista SO

Global Crossing Limited

Tel.: (55 11) 3957-2945

Cel.: (55 11) 8231-1851

danilo.chilene () globalcrossing com




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