OpenBSD3.8+PF+PFSYNC+CARP

5.简单测试:
在FreeBSD虚拟机中,ping一个Internet上的真实IP,随便关闭那一台OpenBSD都可以.:em02::em02:
附ifconfig
1.OpenBSD(GZ)
lo0: flags=8049 mtu 33224
        groups: lo
        inet 127.0.0.1 netmask 0xff000000
pcn0: flags=8b43 mtu 1500
        lladdr 00:0c:29:fe:67:4b
        groups: egress
        media: Ethernet autoselect (autoselect)
        inet 192.168.0.110 netmask 0xffffff00 broadcast 192.168.0.255
pcn1: flags=8b43 mtu 1500
        lladdr 00:0c:29:fe:67:55
        media: Ethernet autoselect (autoselect)
        inet 192.168.20.110 netmask 0xffffff00 broadcast 192.168.20.255
pcn2: flags=8843 mtu 1500
        lladdr 00:0c:29:fe:67:5f
        media: Ethernet autoselect (autoselect)
        inet 192.168.30.110 netmask 0xffffff00 broadcast 192.168.30.255
pflog0: flags=141 mtu 33224
pfsync0: flags=0 mtu 1348
        pfsync: syncdev: pcn2 syncpeer: 192.168.30.200 maxupd: 128
enc0: flags=0 mtu 1536
carp0: flags=8843 mtu 1500
        carp: BACKUP carpdev pcn0 vhid 1 advbase 1 advskew 0
        groups: carp
        inet 192.168.0.200 netmask 0xffffff00 broadcast 255.255.255.0
carp1: flags=8843 mtu 1500
        carp: BACKUP carpdev pcn1 vhid 2 advbase 1 advskew 0
        groups: carp
        inet 192.168.20.200 netmask 0xffffff00 broadcast 255.255.255.0
2.OpenBSD(PY)
lo0: flags=8049 mtu 33224
        groups: lo
        inet 127.0.0.1 netmask 0xff000000
pcn0: flags=8b43 mtu 1500
        lladdr 00:0c:29:cc:f5:37
        groups: egress
        media: Ethernet autoselect (autoselect)
        inet 192.168.0.120 netmask 0xffffff00 broadcast 192.168.0.255
pcn1: flags=8b43 mtu 1500
        lladdr 00:0c:29:cc:f5:41
        media: Ethernet autoselect (autoselect)
        inet 192.168.20.120 netmask 0xffffff00 broadcast 192.168.20.255
pcn2: flags=8843 mtu 1500
        lladdr 00:0c:29:cc:f5:4b
        media: Ethernet autoselect (autoselect)
        inet 192.168.30.120 netmask 0xffffff00 broadcast 192.168.30.255
pflog0: flags=141 mtu 33224
pfsync0: flags=0 mtu 1348
        pfsync: syncdev: pcn2 syncpeer: 192.168.30.200 maxupd: 128
enc0: flags=0 mtu 1536
carp0: flags=8843 mtu 1500
        carp: MASTER carpdev pcn0 vhid 1 advbase 1 advskew 0
        groups: carp
        inet 192.168.0.200 netmask 0xffffff00 broadcast 255.255.255.0
carp1: flags=8843 mtu 1500
        carp: MASTER carpdev pcn1 vhid 2 advbase 1 advskew 0
        groups: carp
        inet 192.168.20.200 netmask 0xffffff00 broadcast 255.255.255.0
3.FreeBSD
# ifconfig
lnc0: flags=108843 mtu 1500
        inet 192.168.20.10 netmask 0xffffff00 broadcast 192.168.20.255
        inet6 fe80::20c:29ff:fe1d:bbda%lnc0 prefixlen 64 scopeid 0x1
        ether 00:0c:29:1d:bb:da