Hello List,

I have this old problem I did not find a solution yet. The endpoints are 
running OpenVPN 2.4.6 respectively.
The setup is bridged like this:


Net A ---> (br0) Debian OpenVPN Bridge server 1 (tap0) --> Internet --> (tap0) 
Debian OpenVPN Bridge server 2 (br0) --> Net B

Net A and B is the same subnet. The problem is that there are some hosts which 
can't be resolved in layer2 when going from A to B.


For example running a ping against one machine on B and arp -an on a machine in 
A would get you:

? (10.0.0.15) at <incomplete> on wlan0

I can even add a static ARP entry on server 1 for this machine, it won't help.

However as soon as I ping that machine from VPN server 1, ARP will start 
working and the machine will become reachable from the whole A network.

What is annoying about this is that this does not happen for all the machines.

Did anyone run into this problem? A workaround could be to fping the whole 
subnet from the router periodically but if there is a better solution I would 
just take that (or if this is a known bug and it was fixed in a later OpenVPN 
release I might consider upgrading the endpoints).


Thanks





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