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Date:      Thu, 18 Oct 2001 12:54:30 +1000 (EST)
From:      "David Trzcinski" <xlr82xs@eis.net.au>
To:        freebsd-security@FreeBSD.ORG
Subject:   Re: Using IPFW with dynamic IP
Message-ID:  <200110180254.f9I2sU809937@tinny.eis.net.au>

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Personly, i would recomend useing /etc/ppp/ppp.linkup with the MYADDR 
variable

ie: !bg /sbin/ipfw (or wherever your ipfw program resides...) add 20 
allow tcp from any to MYADDR in via INTERFACE established

though, I have found that SOMETIMES, the ppp script doesn't actually 
add all of the rules...mine are numbered in incresments of 10, but on 
the rare occasion, several rules may be left out so i go from say 60 to 
110

but that isn't really that big of a deal...also, if you're useing 
dialup, and dont have any other computers sitting behind your freebsd 
one, or are useing something like nat, you could simply use "any" as 
your local host in ipfw

ie: ipfw add 20 allow tcp from any to any in via tun0 established

or whatver your network interface is

either way, when you view the logs generated (/var/log/security 
or /var/log/all.log (if enabled)) you will see your computers current 
ip listed in the rule...just not if you ipfw -list



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