Revert "fix dhcp not working issue for some routers"
Revert "fix dhcp not working issue for some routers"

This reverts commit 6a6af1946ae7a88952b3bc664f7fd6175b1bac49.

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