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MTU/MSS problem with Wireguard router
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Topic: MTU/MSS problem with Wireguard router (Read 933 times)
MikeSouth
Newbie
Posts: 4
Karma: 0
MTU/MSS problem with Wireguard router
«
on:
August 25, 2024, 07:38:10 pm »
Hi, I've setup OPNsense 24.7.2 as a router as described here
https://docs.opnsense.org/manual/how-tos/wireguard-selective-routing.html
.
This works great for my linux machines once I've set the Interface MTU to 1420 on the ISC DHCP server.
My Macbooks are not picking up the change and I can't use the router without setting the MTU manually from 1500 to 1420.
I am sure that I've done something wrong, could someone please point me in a direction.
The wireguard instance and the LAN interface do not have a MTU set. I've tried unsuccessfully.
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joezeppy
Newbie
Posts: 6
Karma: 0
Re: MTU/MSS problem with Wireguard router
«
Reply #1 on:
August 28, 2024, 01:44:05 pm »
Instead of trying to change the MTU on the interfaces, try changing the MTU in the WireGuard instance configuration. (toggle 'advanced mode' to see the MTU setting). I have found that I need to set it to 1360 for my road warrior devices.
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Deciso DEC850v2
MikeSouth
Newbie
Posts: 4
Karma: 0
Re: MTU/MSS problem with Wireguard router
«
Reply #2 on:
September 02, 2024, 09:46:26 am »
I've already tried to do that, I went as low as 1280.
I've started with a fresh install, I've tried normalisation, nothing helped besides setting the MTU on the client.
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Phil
Newbie
Posts: 8
Karma: 0
Re: MTU/MSS problem with Wireguard router
«
Reply #3 on:
September 19, 2024, 12:50:16 am »
Hi previously i had 40-50Mb/s in upload with Wireguard with MTU 1372 in WG interface but it seems since update it's max 10Mb/s
What happened? is it the same for you?
Best regards
PS: i tried with MSS in lan but the same result
cf:
https://forum.opnsense.org/index.php?topic=21184.0
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Phil
Newbie
Posts: 8
Karma: 0
Re: MTU/MSS problem with Wireguard router
«
Reply #4 on:
September 23, 2024, 09:51:39 pm »
?
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MTU/MSS problem with Wireguard router