Date: Fri, 31 Jan 2003 11:37:52 -0500 From: Jason Morgan <jwm-freebsd@sentinelchicken.net> To: freebsd-questions@freebsd.org Subject: IPFW2 setup Message-ID: <20030131163752.GC354@sentinelchicken.net>
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OK, I've read the man page for IPFW a couple times and I am still having difficulty setting up a working firewall. The firewall acts as a gateway to my inside network as well as a web server and mail server. I also need ssh connectivity from inside and out. Also, one odd thing is that I have a Zyxel Prestige 643 acting as an additional router between me and my DSL connection (I couldn't figure out how to get the router in pure bridging mode). It comes in handy, though, as it has a 4-port switch built in and can also act a firewall and does the PPPoE easy enough. NICs: xl0 as 192.168.1.101 (to Zyxel and outside) dc0 as 10.0.0.1 (inside) Current IPFW config: --------------------------------------------------------- # Basics add 00010 pass all from any to any via lo0 add 00020 deny all from any to 127.0.0.0/8 add 00030 deny ip from 127.0.0.0/8 to any add 00040 deny ip from any to any frag # Spoofing Check add 00050 deny all from 10.0.0.0/8 to any in via xl0 add 00060 deny all from 172.16.0.0/12 to any in via xl0 add 00080 allow all from 192.168.1.1 to any in via xl0 add 00085 deny all from 192.168.0.0/16 to any in via xl0 # Divert add 00100 divert natd all from any to any via xl0 # Allowances add 00200 allow all from any to any in via dc0 # Check state of dynamic rules add 00220 check-state # UDP add 00300 allow udp from any to any out setup add 00310 deny udp from any to any established add 00320 allow udp from any to any 53 in via xl0 setup keep-state # TCP add 00400 allow tcp from any to any out setup keep-state add 00410 deny tcp from any to any established add 00420 allow tcp from any to any 22,25,80 in setup keep-state add 32000 allow all from any to any ------------------------------------------------------------ Could anyone offer some advice? Regards, Jason To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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