I have a bridged OpenVPN setup where the OpenVPN tap0 driver is bridged (via bridge0) to the physical em1 interface, which has a VIP via a carp1 interface:

        ether 00:0c:29:61:2a:55
        inet netmask 0xffffff00 broadcast
        media: Ethernet autoselect (1000baseTX <full-duplex>)
        status: active
bridge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 9a:6a:9f:b2:65:da
        id 00:00:00:00:00:00 priority 32768 hellotime 2 fwddelay 15
        maxage 20 holdcnt 6 proto rstp maxaddr 100 timeout 1200
        root id 00:00:00:00:00:00 priority 32768 ifcost 0 port 0
        member: tap0 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 11 priority 128 path cost 2000000
        member: em1 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 2 priority 128 path cost 20000
tap0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 00:bd:48:03:00:00
        Opened by PID 24616
carp1: flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500
        inet netmask 0xffffff00
        carp: MASTER vhid 2 advbase 1 advskew 0

The problem I have is that when I ping the VIP from a VPN client (on tap0), the server receives arp requests for the VIP on tap0, but it does not respond to them:

# tcpdump -i tap0 -ln
11:29:13.637048 arp who-has tell

Is there any way to get the server to respond to arp requests on tap0 for the VIP?

This is all on FreeBSD 7.1 with OpenVPN 2.0.6 (both client and server).


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