North American Network Operators Group|
Date Prev | Date Next |
Date Index |
Thread Index |
Author Index |
Re: a record?
- From: Patrick Lynchehaun
- Date: Wed Nov 16 07:53:10 2005
Title: Re: a record?
In Iptables you can keep port 22 closed until needed, opening it first by telneting to a higher port say 5500 and Iptables just giving access to this ip. If you want to close it again you can telnet back in on another assigned port say 5501, thus closing ssh port to that ip.
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -m recent --rcheck --name SSH -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 5500 -m recent --name SSH --set -j DROP
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 5501 -m recent --name SSH --remove -j DROP
>> Moving sshd from port 22 to port 137, 138 or 139. Nasty eh?
>don't do that! Lots of (access) isps around the world (esp here in
>Europe) block those ports
If you're going to move sshd somewhere else, port 443 is a fine
choice. Rarely blocked, rarely probed by ssh kiddies. It's probed
all the time by malicious web spiders, but since you're not a web
server, you don't care.
This e-mail contains confidential information or information belonging
to Servecentric Ltd and is intended solely for the addressee(s). The
unauthorized disclosure, use, dissemination or copy (either in whole or
in part) of this e-mail, or any information it contains, is prohibited.
Any views or opinions presented are solely those of the author and do
not necessarily represent those of Servecentric Ltd. E-mails are
susceptible to alteration and their integrity cannot be guaranteed.
Servecentric shall not be liable for the contents of this e-mail if
modified or falsified. If you are not the intended recipient of this
e-mail, please delete it immediately from your system and notify the
sender of the wrong delivery and of the email's deletion.