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# $OpenBSD: ifstated.conf,v 1.6 2005/02/07 06:08:10 david Exp $
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# This is a sample config for a pair of firewalls with two interfaces
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#
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# carp0 and carp1 have ip addresses on 192.168.3.0/24 and 192.168.6.0/24
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# respectively.
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# net.inet.carp.preempt must be enabled (set to 1) for this to work correctly.
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# Uncomment one of the following lines to force primary/backup status.
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# init-state primary
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# init-state backup
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carp_up = "carp0.link.up && carp1.link.up"
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carp_down = "!carp0.link.up && !carp1.link.up"
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carp_sync = "carp0.link.up && carp1.link.up || \
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!carp0.link.up && !carp1.link.up"
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# The "net" addresses are other addresses which can be used to determine
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# whether we have connectivity. Make sure the hosts are always up, or
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# test multiple ip's, 'or'-ing the tests.
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net = '( "ping -q -c 1 -w 1 192.168.6.8 > /dev/null" every 10 && \
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"ping -q -c 1 -w 1 192.168.3.8 > /dev/null" every 10)'
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# The peer addresses below are the real ip addresses of the OTHER firewall
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peer = '( "ping -q -c 1 -w 1 192.168.6.7 > /dev/null" every 10 && \
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"ping -q -c 1 -w 1 192.168.3.7 > /dev/null" every 10)'
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state auto {
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if $carp_up
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set-state primary
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if $carp_down
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set-state backup
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}
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state primary {
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init {
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run "ifconfig carp0 advskew 10"
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run "ifconfig carp1 advskew 10"
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}
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if ! $net
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set-state demoted
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}
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state demoted {
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init {
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run "ifconfig carp0 advskew 254"
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run "ifconfig carp1 advskew 254"
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}
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if $net
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set-state primary
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}
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state promoted {
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init {
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run "ifconfig carp0 advskew 0"
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run "ifconfig carp1 advskew 0"
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}
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if $peer || ! $net
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set-state backup
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}
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state backup {
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init {
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run "ifconfig carp0 advskew 100"
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run "ifconfig carp1 advskew 100"
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}
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# The "sleep 5" below is a hack to dampen the $carp_sync when we come
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# out of promoted state. Thinking about the correct fix...
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if ! $carp_sync && $net && "sleep 5" every 10
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if ! $carp_sync && $net
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set-state promoted
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}
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