vm-bhyve, routing a subnet behind the main ip, is this a good / "correct" solution?

[Mathias Picker]

Hi all,

this is the first time I tried to use bhyve.

This is 12.0-RELEASEp3 and vm-bhyve 1.2.3.

My hosting provider hetzner.de is giving out subnets which are 
routed through the main ip of the server,
so if my main IP is xxx.xxx.xxx.63 the subnet yyy.yyy.yyy.224/28 
is routed as if it was "behind" the main ip xxx.xxx.xxx.xxx.

I first didn't know that and tried the solution mentioned in the 
vm-bhyve wiki, usiing a bridge and adding the network card (em0) 
to it, which didn't work.

Since I never used byhve I wasn't to sure where the error was, but 
after asking Hetzners support and getting info about their setup I 
guessed it was the bridge.

So I just removed the interface from the bridge and added the 
subnet to it.

This seems to work, even without adding a static route, netstat -r 
gives

yyy.yyy.yyy.224/28   link#3             U      vm-public

after a reboot (vm-public is the name of the bridge), and now the 
bhyve VMs have network connection.

I'm still a bit puzzled if using a "bridge" this way is a good 
configuration.

And why do I not need a gateway address? Yeah, my IP knowledge is 
a bit thin ;)

Thanks for any comments,

Mathias


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Mathias Picker                        
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