Hi Mathias,
twin# ifconfig
igb0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric
0 mtu 1500

options=400b8<VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,VLAN_HWTSO>
         ether 0c:c4:7a:05:81:be
         inet 1yy netmask 0xffffffc0 broadcast 1yy
         inet6 fe80::ec4:7aff:fe05:81be%igb0 prefixlen 64 scopeid 0x1
         inet 1xx netmask 0xfffffff8 broadcast 1
         inet 1xx netmask 0xffffffff broadcast 1
         inet 1xx netmask 0xffffffff broadcast 1

Looks like there might be an error with the IPv4 config of the igb0 interface - those addresses appear to be invalid. Though, that shouldn't really matter for a bridged config.

bridge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu
1500
         ether 02:3d:80:23:57:00
         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 32768 ifcost 0 port 0
         member: tap8000 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                 ifmaxaddr 0 port 5 priority 128 path cost 2000000
         member: igb0 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                 ifmaxaddr 0 port 1 priority 128 path cost 20000

 That looks Ok.

tap0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
         options=80000<LINKSTATE>
         ether 00:bd:15:8e:4a:00
         nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
         media: Ethernet autoselect
         status: no carrier
tap8000: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST>
metric 0 mtu 1500
         options=80000<LINKSTATE>
         ether 00:bd:76:11:59:40
         nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
         media: Ethernet autoselect
         status: active
         Opened by PID 30817

bhyve is started like this:

/usr/sbin/bhyve -c 1 -m 2048 -A -H -W -s 0,hostbridge -s
2,ahci-hd,/usr/local/vmrc/vm//zimbra-centos-six.five0/zimbra-c
entos-six.five0.img -s 3:0,virtio-net,tap8000 -s 5,lpc -l com1,stdio
zimbra-centos-six.five0

So, from what I understand, the tap device is created, bridged, and put
correctly in the bhyve incantation.

So: why do I not have a network card in centos:

Can you try a 'lspci -vv' at the Linux shell prompt ? That will show if the virtio-net PCI device was at least probed.

 When you did the initial install, was any networking configured ?

later,

Peter.

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