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Re: [IPsec] draft-liu-ipsecme-ikev2-mtu-dect early TSVAREA review

"touch@strayalpha.com" <touch@strayalpha.com> Sat, 14 January 2023 06:01 UTC

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From: "touch@strayalpha.com" <touch@strayalpha.com>
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Date: Fri, 13 Jan 2023 22:00:49 -0800
Cc: Tero Kivinen <kivinen@iki.fi>, ipsec@ietf.org
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To: Daniel Migault <mglt.ietf@gmail.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/ipsec/AWTYVpNSgtXqOE5qn1JkG1-kaLc>
Subject: Re: [IPsec] draft-liu-ipsecme-ikev2-mtu-dect early TSVAREA review
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Daniel,

> On Jan 13, 2023, at 8:33 PM, Daniel Migault <mglt.ietf@gmail.com> wrote:
> 
> f not, to better understand, do we have an example of a packet that cannot be processed if the MTU is set to tunMAP but that can be processed if the MTU is set to EMTU_R. 


As per intarea-tunnels, MTU is a highly overloaded term.

Tunnels relay packets that exceed their tunMAP but not their tunMTU (EMTU_R - headers) using source fragmentation all the time.

However, that’s the issue. The reasons why what you’re trying to do isn’t useful is already covered in detail in intarea-tunnels - and why not to do it using IPv4 DF=0 in rfc6864.

It’s not useful to have an email exchange rehashing that content message by message.

Joe

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