Subject: Re: [PATCH v2 2/2] selftests: net: add act_nat ICMP inner checksum test

From: Jakub Kicinski <[email-masked]>
Date: Sat, 4 Apr 2026 11:01:30 -0700

On Sat,  4 Apr 2026 13:03:10 +0100 David Carlier wrote:
> Verify that act_nat correctly updates the inner IP header
> checksum when rewriting addresses inside ICMP error payloads.
> 
> The test sets up two namespaces with act_nat on a veth pair,
> triggers an ICMP destination unreachable, and validates the
> inner IP header checksum in the received ICMP error.
> 
> Signed-off-by: David Carlier <[email-masked]>
> ---
>  tools/testing/selftests/net/Makefile          |   1 +

you need to add the CONFIG* dependencies to the relevant config file.