Fix ipv4 undefined bug (#1712)
Fix ipv4 undefined bug (#1712)

* fix lan bug


firewalla/firewalla,MelvinTo/firewalla,MelvinTo/firewalla,firewalla/firewalla,firewalla/firewalla,firewalla/firewalla,MelvinTo/firewalla,MelvinTo/firewalla,firewalla/firewalla,MelvinTo/firewalla