> As a new firewall admin I have a question for the white hats. I log port
> scans and do a whois to locate the ISP that owns the ip address. My questions
> is what else
> can/should be done. I have no other reason to believe they got through or
> committed any crime. What else are you guys doing? I hope this is not to
> far off topic.
For most servers, I log the scan and drop the originating IP address into
hosts.deny (or equivalent). If I see repeated scans, or particularly
malicious ones, I'll send a note to that domain's administrators. Any more
than that might piss someone off enough to really try to break in, or DOS
me, or whatever.
For web servers and public FTP sites (where I wouldn't necessarily want to
block hosts wholesale) I'll log suspicious activity and investigate.
Typically, though, the webservers are only serving pages, so they can be put
in a DMZ and sufficiently hardened.
E -
Received on May 24 2000
Intro
