Hey All,

I'm in the process of reorganizing my bhyve setup on my development
laptop. I'd like to have rename the tap devices to match the name of
the VM so that it's easier to keep track of. Otherwise, I have to keep
a spreadsheet of (tap3 -> win10-vm, tap4 -> fbsd-vm).

It appears bhyve doesn't attach renamed tap devices. Here's the steps
I used:

ifconfig bridge0 create
ifconfig tap0 create name fbsd-01
ifconfig bridge0 addm em0 addm fbsd-01 up
sh /usr/share/examples/bhyve/vmrun.sh -t fbsd-01 [normal vmrun.sh arguments 

(In this example, em0 is the physical network device connected to the
LAN. I want to share em0 with the host and the guest via the bridge.)

The net.link.tap.up_on_open sysctl node is set to 1. Normally, when
bhyve starts up (with tap0 instead of fbsd-01), it opens the tap
device and UPs it. I'm not seeing that same behavior with a renamed
tap interface:

$ ifconfig ld-03_01
ld-03_01: flags=8903<UP,BROADCAST,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 00:bd:df:e9:f6:04
        groups: tap
        media: Ethernet autoselect
        status: no carrier

So, it seems to me that bhyve doesn't like it when tap devices are
renamed. Can anyone shed some light on this?


Shawn Webb
Cofounder and Security Engineer

Tor-ified Signal:    +1 443-546-8752
GPG Key ID:          0x6A84658F52456EEE
GPG Key Fingerprint: 2ABA B6BD EF6A F486 BE89  3D9E 6A84 658F 5245 6EEE

Attachment: signature.asc
Description: PGP signature

Reply via email to