Date: Mon, 1 Sep 2003 15:29:36 +0200 From: =?iso-8859-1?Q?Sten_Daniel_S=F8rsdal?= <sten.daniel.sorsdal@wan.no> To: <freebsd-ipfw@freebsd.org> Subject: IPFW2, sets and dynamic rules. Message-ID: <0AF1BBDF1218F14E9B4CCE414744E70F07DF31@exchange.wanglobal.net>
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Being a complete ipfw idiot, i hoped someone could clarify this to me. I wrote a simple firewall script that uses dynamic rules (stateful = rules). It's basically like this (handwritten, real script is alot bigger); =3D=3D=3D=3D=3D ipfw set disable 1 ipfw -q delete set 1 ipfw set disable 1 ipfw add 100 set 1 check-state ipfw add 101 set 1 skipto 1000 ip from any to any in via fxp0 // = internet ipfw add 102 set 1 skipto 2000 ip from any to any out via fxp0=09 ipfw add 103 set 1 skipto 3000 ip from any to any in via fxp1 // lan ipfw add 104 set 1 skipto 4000 ip from any to any out via fxp1 ipfw add 105 set 1 allow ip from any to any ipfw add 1000 set 1 deny ip from any to any ipfw add 2000 set 1 allow ip from me to any keep-state ipfw add 2001 set 1 deny ip from any to any ipfw add 3000 set 1 allow tcp from 192.168.0.0/16 to any setup = keep-state ipfw add 3001 set 1 allow udp from 192.186.0.0/16 to any keep-state ipfw add 3002 set 1 deny ip from any to any ipfw add 4000 set 1 allow ip from me to any keep-state ipfw add 4001 set 1 deny ip from any to any ipfw set swap 0 1 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D after the swap, the dynamic rules that were added when runnin on set 0 = to begin with (same script). does seem to work at first glance however if i add a rule at say 100 and = shift all other rules down,=20 and re-run the script then what happens with the dynamic rules? the tcp = connections break. do the dynamic rules always point to the same set or do the point to the = new set when i run swap? do i need to enable set 1 afterwards to make it work? how is then the = line of rule execution, when two sets are enabled?=20 are there any ways to change the set 0 rules while still retaining the = functionality of the old dynamic rules? - Sten
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