netdev - Re: [RFC net-next] ipv6: Support for anonymous tunnel decapsulation

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Date:   Fri, 27 Aug 2021 09:32:10 +0200
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     Justin Iurman <justin.iurman@...ege.be>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        yoshfuji@...ux-ipv6.org, dsahern@...nel.org, tom@...bertland.com,
        edumazet@...gle.com
Subject: Re: [RFC net-next] ipv6: Support for anonymous tunnel decapsulation

Le 26/08/2021 à 18:23, Justin Iurman a écrit :

[snip]

>>> Thoughts?
>> I'm not sure to understand why the current code isn't enough. The fallback
>> tunnels created by legacy IP tunnels drivers are able to receive and decapsulate
>> any encapsulated packets.
> 
> Because, right now, you need to use the ip6_tunnel module and explicitly configure a tunnel, as you described below. The goal of this patch is to provide a way to apply an ip6ip6 decapsulation *without* having to configure a tunnel.

What is the difference between setting a sysctl somewhere and putting an
interface up?