----- Original Message -----
> It is connected to the physical nic via a switch (no intermediate
> routers).   DHCP doesn't even attempt because there is no carrier on
> tap0:
> 
> em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>       
> options=4219b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,WOL_MAGIC,VLAN_HWTSO>
>       ether 30:85:a9:ec:24:95
>       inet 10.0.10.10 netmask 0xffffff00 broadcast 10.0.10.255
>       inet6 fe80::3285:a9ff:feec:2495%em0 prefixlen 64 scopeid 0x1
>       nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
>       media: Ethernet autoselect (100baseTX <full-duplex>)
>       status: active
> re0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
>       
> options=8209b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC,LINKSTATE>
>       ether 90:f6:52:00:40:e6
>       nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
>       media: Ethernet autoselect (100baseTX <half-duplex>)
>       status: no carrier
> lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
>       options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
>       inet 127.0.0.1 netmask 0xff000000
>       inet6 ::1 prefixlen 128
>       inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
>       nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
> tap0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>       options=80000<LINKSTATE>
>       ether 00:bd:0c:6e:02:00
>       inet6 fe80::2bd:cff:fe6e:200%tap0 prefixlen 64 scopeid 0x4
>       nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
>       media: Ethernet autoselect
>       status: no carrier
> root@petitecloud:/home/aryeh # if
> if       ifconfig ifmcstat
> root@petitecloud:/home/aryeh # ifconfig bridge0 create
> root@petitecloud:/home/aryeh # ifconfig bridge0 addm em0 addm tap0
> root@petitecloud:/home/aryeh # ifconfig tap0 10.0.10.3


You need to at least up the bridge.


> bridge0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
>       ether f6:3c:f0:0f:b9:48
>       nd6 options=1<PERFORMNUD>
>       id 00:00:00:00:00:00 priority 32768 hellotime 2 fwddelay 15
>       maxage 20 holdcnt 6 proto rstp maxaddr 2000 timeout 1200
>       root id 00:00:00:00:00:00 priority 0 ifcost 0 port 0
>       member: tap0 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
>               ifmaxaddr 0 port 4 priority 128 path cost 2000000
>       member: em0 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
>               ifmaxaddr 0 port 1 priority 128 path cost 200000
> root@vcloud:/home/aryeh # dhclient tap0
> tap0: no link .............. giving up
> 
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