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PR #18860 adds firewall rules in the mangle table to save outbound packet marks to conntrack and restore them on reply packets before the routing decision. When reply packets have their marks restored, the kernel uses the correct routing table (based on the mark) and the packets pass the rp_filter check. This makes the risk check and reverse path filtering warnings unnecessary. Updates #3310 Fixes tailscale/corp#37846 Signed-off-by: Mike O'Driscoll <mikeo@tailscale.com>