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Security Tips
Need a quick security fix? Whether its sudo or lilo, tcp or icmp, you'll find short and straight-to-the point guidance in our listing of Security Tips.


Nmap
Posted by Eric Lubow   
Make use of security tools out there to test your server's weaknesses. Nmap is an excellent port scanning tool to test to see what ports you have open. On a remote machine, type the command:
# nmap -sTU

Starting nmap 3.70 ( http://www.insecure.org/nmap/ ) at 2006-08-10 13:51 EST
Interesting ports on eric (172.16.0.1):
(The 3131 ports scanned but not shown below are in state: closed)

   PORT    STATE         SERVICE
   22/tcp  open          ssh
   113/tcp open          auth
Nmap run completed -- 1 IP address (1 host up) scanned in 221.669 seconds

 
Skill
Posted by Eric Lubow   
Users who may be acting up or aren't listening can still be controlled. Using a program called 'skill' (signal kill) which is part of the 'procps' package.
Halt/Stop User eric: skill -STOP -u eric
Continue User eric: skill -CONT -u eric
Kill and Logout User eric: skill -KILL -u eric
Kill and Logout All Users: skill -KILL -v /dev/pts/*

 
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