netdev - Re: [PATCH] seg6: inherit inner IPv4 TTL on ip4ip6 encapsulation

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Message-ID: <81a09216-37a0-4362-8ed7-0a38a4cc5980@kernel.org>
Date: Wed, 22 Jan 2025 09:13:10 -0700
From: David Ahern <dsahern@...nel.org>
To: Ahmed Abdelsalam <ahabdels.dev@...il.com>,
 Jakub Kicinski <kuba@...nel.org>
Cc: Yonglong Li <liyonglong@...natelecom.cn>, linux-kernel@...r.kernel.org,
 netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com
Subject: Re: [PATCH] seg6: inherit inner IPv4 TTL on ip4ip6 encapsulation

On 1/22/25 3:20 AM, Ahmed Abdelsalam wrote:
> Copying hop limit from inner packet can be added via a new sysctl.
> Where the default is to use the node default hop limit, But you can set
> the sysctl value to enable copying from inner packet. 
> 

not a sysctl. vxlan, geneve, mpls have netlink attributes that allow the
TTL to be inherited or propagated. I think that model should apply to seg6.