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Old 07-10-2002, 10:07 PM   #1
Registered: Aug 2001
Location: Magic City, USA
Distribution: Ubuntu
Posts: 73

Rep: Reputation: 15
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, 10:22 PM   #2
Registered: Jun 2002
Location: Bailey, CO
Distribution: Slackware
Posts: 483

Rep: Reputation: 31
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 and search for "root kit".

Have you consider turning ftp?
Old 07-11-2002, 12:29 AM   #3
Registered: Jun 2001
Location: USA
Distribution: Slackware
Posts: 825

Rep: Reputation: 30
How about running OpenBSD? heh
Old 07-11-2002, 08:32 AM   #4
Registered: Jun 2002
Location: Bailey, CO
Distribution: Slackware
Posts: 483

Rep: Reputation: 31
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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