Firewall rules for servers, UDP
luke at foolishgames.com
Tue Aug 19 11:32:05 PDT 2003
I want to setup a firewall (ipfw) on my freebsd 4.8 p3 server. The
machine runs web, ftp, ssh, dns, smtp, and imap to the outside world.
Does anyone have any links to example rules for servers? (I've already
looked at the handbook and man file)
My problem lies in UDP rules. I think I have TCP figured out. My
first attempt blocked off DNS queries from the machine outward. I
could query the DNS server, but apps could not do lookups. i figure it
has something to do with ports above 1024, but I'm not sure how to
define a rule with multi ports in a range, plus I don't know how high
to go above 1024. Is this the right action? Ideas on syntax?
Luke at FoolishGames.com
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"Only two things are infinite, the universe and human stupidity, and
I'm not sure about the former."
- Albert Einstein (1879-1955)
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