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| Subject: | RE: Reflexive firewalls? |
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| 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 http://www.debian-administration.org/articles/268 jmb -----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 myself. tom -- Tom -----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? Thanks.
-- Danilo F. Chilene Especialista SO Global Crossing Limited Tel.: (55 11) 3957-2945 Cel.: (55 11) 8231-1851 danilo.chilene@globalcrossing.com www.globalcrossing.com Att,
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