Re: [PATCH net 2/2] selftests/net: packetdrill: cover challenge ACK on SEG.ACK > SND.NXT

Eric Dumazet
2026-04-20T07:22:37Z

On Sun, Apr 19, 2026 at 7:55 PM Jiayuan Chen <jiayuan.chen@linux.dev> wrote:
>
> Exercise the RFC 5961 Section 5.2 / RFC 793 Section 3.9 requirement
> on the upper edge of the acceptable ACK range, mirroring the existing
> coverage of the SEG.ACK < SND.UNA - MAX.SND.WND case.
>
> After the peer ACKs data the receiver has never sent, the receiver
> must respond with <SEQ = SND.NXT, ACK = RCV.NXT, CTL = ACK> and drop
> the offending segment. The script validates this exact response.
>
> Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev>

Reviewed-by: Eric Dumazet <edumazet@google.com>
Thanks!