If there is a host with an APIPA IP sending broadcasts that match a route-to rule, the traffic gets forwarded by route-to. antispoof should block that scenario, since that IP subnet isn't defined on the source interface. We should change Also, route-to should never forward anything destined to a broadcast MAC address to prevent such scenarios. address. To work around, just add a rule to block APIPA, 169.254.0.0/16. Or ideally don't use overly permissive rulesets, the default rules will not permit this to happen.