From: "Daniel Gröber" <dxld@darkboxed.org>
To: "Marek Küthe" <m-k-mailling-list@mk16.de>
Cc: wireguard@lists.zx2c4.com, luizluca@gmail.com
Subject: Re: IPv6 and PPPoE with MSSFIX
Date: Wed, 23 Aug 2023 19:14:51 +0200 [thread overview]
Message-ID: <20230823171451.ld2fwslkl6blv6y2@House.clients.dxld.at> (raw)
In-Reply-To: <20230823165840.7bf3b910@parrot>
Hi,
On Wed, Aug 23, 2023 at 04:58:40PM +0200, Marek Küthe wrote:
> PPPoE adds 8 bytes of overhead so that an MTU of 1432 can be used. I
> also have to do this at home with my DSL line for example.
> The MTU should be set on each side (on both peers) for this to work.
Oh, I just realized I used the 1432 MTU in my earlier reply based on
Marek's math but since Luiz's underlay network is IPv6 this is not actually
correct. MTU=1440 is only correct on top of IPv4, for IPv6 the "optimal"
MTU is 1420 so with PPPoE involved that's MTU=1412.
1500 Ethernet payload
-40 IPv6 header
-8 UDP header
-32 Wg header
-8 PPPoE
===================
1412 wg tunnel MTU
--Daniel
next prev parent reply other threads:[~2023-08-23 17:18 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-22 20:39 Luiz Angelo Daros de Luca
2023-08-23 14:58 ` Marek Küthe
2023-08-23 17:14 ` Daniel Gröber [this message]
2023-08-23 19:01 ` Luiz Angelo Daros de Luca
2023-08-23 20:47 ` Hugo Slabbert
2023-08-28 22:22 ` Luiz Angelo Daros de Luca
2023-08-23 17:07 ` Daniel Gröber
2023-08-23 19:55 ` Luiz Angelo Daros de Luca
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