bug fix on ifconfig
bug fix on ifconfig

(cherry picked from commit cfd0ddefdbe63fb22147f5f7d5cdecabec747d81)

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