On Thu, 17 Aug 2023 20:14:52 +0000 blurt_overkill...@simplelogin.com wrote:
> I see here[1] that if you're using IPv4 exclusively, you can get away with > an MTU of 1440. If my client only has IPv4 internet, however the server > issues an IPv6 address for use by the client, can the client still use 1440 > without fragmentation, or must the client use 1420, because even though > their connection is IPv4, they are issued an IPv6 address within the tunnel? > > [1] https://lists.zx2c4.com/pipermail/wireguard/2017-December/002201.html Yes they can. This is only affected by whether or not WG itself runs over v4/v6, not whether you use v4 or v6 inside WG. Be aware though that some residential Internet connections use MTU-reducing tunnels for ISP authentication. The most popular one would be PPPoE with 8 bytes that you need to substract, but there also can be L2TP or PPTP with larger overheads. -- With respect, Roman