[PVE-User] Are two bridges to the same network possible?

Frank Thommen f.thommen at dkfz-heidelberg.de
Wed Dec 18 17:05:34 CET 2019


On 12/17/19 10:35 PM, Chris Hofstaedtler | Deduktiva wrote:
> * Frank Thommen <f.thommen at dkfz-heidelberg.de> [191217 22:10]:
>> I probably don't understand the question correctly: One has the IP traffic
>> to the server/hypervisor, the other has IP traffic for the attached VMs and
>> containers.  Is there no need for a gateway if the bridge only provisions
>> VMs and containers with network connectivity? Should I think of the bridge
>> as a dumb connector on the link level (I should probably and urgently reread
>> my networking materials :-)
> 
> You can think of it as a dumb switch. As a special feature, Linux
> allows you to also setup host network connectivity on a bridge - but
> it doesn't have to do that.
> 
> I would guess that on the bridge you want to use for your VMs, you
> don't need an IP adress (and also no gateway then).
> 
> Generally speaking, having more than one default gateway per host is
> an advanced configuration and you really need to know what you're
> doing then. Having multiple interfaces with IP addresses is a common
> thing, but you'llneed to understand how your routing setup works.

Thanks, that helps.  I think I will additionally remove vmbr0 (using 
bond0), as this connection will not be used for any virtual machine or 
container, but only to access the hypervisor itself.

frank


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