Linux Ethernet Bridging - Jun 2016 - [Bridge] NFS connection drops as interface added to bridge

Hi,

I am running PXE boot with Debian Stretch image, with eth2 interface
bound to kernel for doing NFS mounts.

I am trying to add this interface to the bridge, for network
communication across virtual interfaces, however the NFS drops
connections as soon as I add the interface.

Can you please help me on how to do the NFS mount's over a bridge connection
?

-- 
Thanks,
Udaya Puvvadi
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On Tue, 7 Jun 2016 12:20:42 -0400
Udaya Puvvadi <upuvvad1 at binghamton.edu> wrote:
> Hi,
> 
> I am running PXE boot with Debian Stretch image, with eth2 interface
> bound to kernel for doing NFS mounts.
> 
> I am trying to add this interface to the bridge, for network
> communication across virtual interfaces, however the NFS drops
> connections as soon as I add the interface.
> 
> Can you please help me on how to do the NFS mount's over a bridge
connection ?
> 
There are two possible issues:
1. When an interface is part of the bridge, you must not try and use the
interface
   directly.  I.e once eth2 is part of br0, don't use eth2 again. Most
importantly
   never assign an IP address to the interface. Many people doing this kind of
thing
   end up reading the IP address of the interface (eth2), then removing all
addresses
   from the interface (eth2) before assigning it to the bridge, then apply the
IP address
   back to the bridge device.

2. The bridge device itself has a MAC address for local packets. This MAC
address is
   based on all the devices in the bridge (by default). Therefore when eth2 is
added
   to a bridge with other devices present, the MAC address for locally sent
packets
   will change.