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Add packetdrill tests for IPv4 and IPv6 to verify that the advertised MSS in SYN-ACK is derived from the configured interface/route MTU, and is not shrunk by learned Path MTU exceptions from previous outbound connections. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev> Link: https://patch.msgid.link/20260815071532.301908-1-jiayuan.chen@linux.dev Signed-off-by: Jakub Kicinski <kuba@kernel.org>