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Old 07-10-2002, 09:07 PM   #1
Cpare
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Registered: Aug 2001
Location: Magic City, USA
Distribution: Ubuntu
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Post A moving target is always tougher to hack...


Looks like I have been getting a FTP BF attack on my linux router hanging off of a cable modem. I am looking for suggestions on how I could continually get NEW ip addresses so I am not always sitting on the same IP...

I know a DHCP lease attempts to renew @ 50% the lease period, but only expires at 100%, and unfortunately even if I drop it on my client, the DHCP server will keep it registered...

So, could I set my firewall to not allow DHCP traffic, then have a cron job kick in every 24hrs and 5 mins to modify the firewall ruleset, get me a nice new IP and lock the system back down? I assume the new IP could then be sent to my e-mail address so I could still access it as needed....

There must be an easier way that won't cause downtime. Suggestions???
 
Old 07-10-2002, 09:22 PM   #2
pickledbeans
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Registered: Jun 2002
Location: Bailey, CO
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First thing you have to determine if you have actaully been?
"cracked" or not? If you have then the best soluion is rebuild the server?

Go to http://freshmeat.net and search for "root kit".

Have you consider turning ftp?
 
Old 07-10-2002, 11:29 PM   #3
php
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How about running OpenBSD? heh
 
Old 07-11-2002, 07:32 AM   #4
pickledbeans
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Registered: Jun 2002
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Quote:
Originally posted by hackers_
How about running OpenBSD? heh
Hey, now this is a family forum

Also see my post (BSD forum) subject "Theo on changes to Apcache" .... Let's just saying marriage hasn't mellowed Theo out .....
 
  


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