From owner-freebsd-security  Tue Dec 18 12:43:44 2001
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To: freebsd-security@FreeBSD.ORG
Date: Wed, 19 Dec 2001 04:44:40 +0800
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Subject: about ipfw 
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1. can ipfw do a TCP keep-state ?
2. how keep-state combine with "via interface" ?
3. this ipfw rules don't work: why ?
ipfw add pass all any to any via lo
ipfw add pass all any to any via ${iif}
ipfw add divert natd all from any to any via ${oif}
# Allow TCP through if setup succeeded
ipfw add check-state
${fwcmd} add deny tcp from any to any established

# Allow IP fragments to pass through
${fwcmd} add deny all from any to any via ${oif} frag

# Allow icmp 0 3 8 11 pass
${fwcmd} add pass icmp from any to any via ${oif} icmptypes 0,3,8,11

# Reject&Log all setup of incoming connections from the outside
${fwcmd} add deny log tcp from any to any in via ${oif} setup 

# Allow setup of any other TCP connection
${fwcmd} add pass tcp from any to any out via ${oif} setup keep-state

# Allow DNS queries out in the world
${fwcmd} add pass udp from ${oip} to any 53 out via ${oif} keep-state

# Allow NTP queries out in the world
${fwcmd} add pass udp from ${oip} to any 123 out via ${oif} keep-state

${fwcmd} add deny log all from any to any



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