tap interfaces disappears after bhyve guests shutdowns

[C. L. Martinez]

On Mon, Feb 13, 2017 at 02:02:48PM +0100, Daniel Niculescu wrote:
> 
> 
> On 02/13/17 13:37, Miroslav Lachman wrote:
> > C. L. Martinez wrote on 2017/02/13 13:09:
> > 
> > >   Why when a bhyve guest shutdowns or reboot tap interfaces goes
> > > down and lost IP assigned address?. I need to use same tap interface
> > > for several guests and assign an IP to this tap interface to act as
> > > a router for these guests.
> > > 
> IP address is set on the guest, so as long as you have the network set up
> the IP address will be persistent.
> What you need is a bridge to which you add all your tap interfaces.
> 
> Set the kernel state as advised by Martinez and make sure you have it also
> in /etc/sysctl.conf:
> #sysctl net.link.tap.up_on_open=1
> #echo "net.link.tap.up_on_open=1" >> /etc/sysctl.conf
> 
> Create a bridge interface:
> #ifconfig bridge0 create
> 
> Add your host interface if you want external connectivity for your guests:
> #ifconfig bridge0 addm em0
> 
> Create the tap interfaces for the guests:
> #ifconfig tap0 create
> #ifconfig tap1 create
> 
> Add them to the bridge:
> #ifconfig bridge0 addm tap0 addm tap1
> 
> After booting the guests, they will be both bridged with your physical
> interface em0 (replace em0 with your actual interface):
> 
> #ifconfig bridge0
> bridge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu
> 1500
>     description: vm-local
>     ether 02:ed:0d:ca:74:00
>     nd6 options=1<PERFORMNUD>
>     groups: bridge
>     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: tap1 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
>             ifmaxaddr 0 port 5 priority 128 path cost 2000000
>     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 20000
> 
> Perhaps you could use an utility to manage the VMs, like vm-bhyve, iohyve,
> etc.
> 
> 

Thanks Daniel. I have tried what you say, but ping doesn't works between host and guest. If I put an ip to the bridge works ok, but not when I assign an ip to tap interface.

Any idea why??

-- 
Greetings,
C. L. Martinez