OpenVPN MTU-value is wrong on VPN-Server br0 and on tap1/2

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Sp1derman
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Joined: 16 Jun 2006
Posts: 223
Location: Germany, BW
PostPosted: Wed Jul 17, 2024 12:45    Post subject: OpenVPN MTU-value is wrong on VPN-Server br0 and on tap1/2 Reply with quote
2x X64, 2 x build 55615, OVPN Bridge, OVPN version 2.6.10

I had to adjust the VPN-Tunnel MTU to 1420 as I suddenly got fragment Errors (EMSGSIZE...)
I noticed that on Client side br0 and tap1 got the same MTU value as Tunnel-MTU, but on server side br0 and tap2 are still at MTU 1500.

I change the values on server by hand, but after rebooting server br0 was still at MTU 1420 but tap2 was back to 1500. So I then changed back br0 to 1500.
I'm wondering if this the correct behaviour on server side, but I assume br0 and tap on server also should get the Tunnel-MTU value.

Any ideas?

EDIT:
After doing some more research I'm pretty sure.
On VPN-Server the MTU of br0 and the tun/tap device has to have the value of the tunnel-MTU.
This might cause some more trouble with the never ending VPN-MTU issue.
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