On Thu, Oct 11, 2001 at 07:21:01PM -0400, Leif Madsen wrote:

> I'm in the process of learning how to secure up my linux system. If I do a
> port scan, it says that the ports are closed, but are sending back replies.
> I want to setup a firewall which will not send back any replies so that it
> looks like my computer is a black hole (including not returning "ping"
> requests). I'm wondering what a good firewall to do this is, and what a good
> port scanner is so that I can scan to make sure nothing is returned.
>
> I currently have LogSentry and PortSentry installed, as well as Tiny
> Firewall. Any and all idea's appreciated.
>
> Thanks in advance.

Host based IDS:

http://www.tripwire.org

Network IDS:

http://www.snort.org

Port scanner, network multi-tool:

http://www.nmap.org

OpenWall:

http://www.openwall.com

READ BugTraq!

http://www.securityfocus.com

Linux is a great firewall...

Check out 'iptables':

http://www.linuxguruz.org/iptables/howto/iptables-HOWTO.html

Or stick with 'ipchains':

http://www.linuxdoc.org/HOWTO/IPCHAINS-HOWTO

Just a few of my favorites... sorry it seems it ran long.... ;)

> --
> Leif Madsen - Project Manager
> http://www.plannettechnologies.com
> Registered Linux User #209104
> Current Linux Uptime for chmod.petrolia.net
> 7:05pm up 1 day, 2:13, 2 users, load average: 0.01, 0.00, 0.05
>

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