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According to the source code, flowlabel_consistency must be deactivated for the IPV6_FL_F_REFLECT flag to work. Since ipv6_flowlabel_mgr now runs in its own network namespace, do this directly from the test binary. Attempt to disable net.ipv6.flowlabel_consistency and skip the reflect test if that fails. A disabled flowlabel_consistency does not affect the remaining features being tested on the file, and failing to disable is not fatal and skips the reflect test only. The previously defined tcp_listen and tcp_connect helpers were reused, since the connection flow required for REFLECT validation is very similar to REMOTE. Signed-off-by: Marcelo Mendes Spessoto Junior <marcelomspessoto@gmail.com> Link: https://patch.msgid.link/20260807220942.421382-5-marcelomspessoto@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>