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| Subject: | Re: Reflexive firewalls? |
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| Date: | Thu, 27 Dec 2007 12:10:35 -0500 |
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?
I call this 'port-knocking' (it might be called reflexive firewalling, but I have not heard that term). It can be done with iptables and googling should turn up a number of how-tos. hth, nick -- Nick Owen WiKID Systems, Inc. 404.962.8983 http://www.wikidsystems.com Commercial/Open Source Two-Factor Authentication irc.freenode.net: #wikid
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