I haven't seen any issues with a WG MTU of 1340, yet anyway.

Lonnie


> On Mar 19, 2021, at 9:29 PM, Michael Knill 
> <michael.kn...@ipcsolutions.com.au> wrote:
> 
> Thanks Lonnie
> 
> Hmm that may have something to do with it. Might also be when it fails over 
> to 4G.
> As most of my VPN's carry voice only, I think a standard MTU of 1340 for all 
> my systems should be fine. What do you think?
> 
> Regards
> Michael Knill
> 
> On 20/3/21, 10:40 am, "Lonnie Abelbeck" <li...@lonnie.abelbeck.com> wrote:
> 
>    Hi Michael,
> 
>    I have not experienced anything like that, WireGuard connectivity is rock 
> solid for me.
> 
>    I don't recall later WireGuard versions having any fixes for what you are 
> describing.
> 
>    Just guessing, the standard MTU for WG is 1420 (1500-80), if you have a 
> PPPoE connection with a MTU of 1492 you might try setting the WG MTU to 1412 
> (1500-8-80) or lower to test.
> 
>    I'm testing a 4G-LTE/5G fixed wireless internet service from T-Mobile, 
> they use Carrier Grade NAT (CGNAT) for IPv4 which lowers the MTU to 1420 
> (just like WG) so WG needs a MTU setting of 1340 to work over the CGNAT or 
> else it hangs.
> 
>    Lonnie
> 
> 
> 
> 
>> On Mar 19, 2021, at 3:42 PM, Michael Knill 
>> <michael.kn...@ipcsolutions.com.au> wrote:
>> 
>> Hi Group
>> 
>> Not sure if anyone else is experiencing this. I'm on 1.3.10 and all my 
>> systems connect via Wireguard VPN to both my softswitches.
>> Its generally all pretty stable but occasionally one of the VPN’s will be 
>> disconnected and I have tried everything I can think of to bring it back up 
>> but only a reboot has managed to do so at this stage.
>> Any ideas?
>> 
>> Regards
>> Michael Knill
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