The SonicWall security appliance at the remote and central site are configured for VPN tunnels for initial DHCP traffic as well as subsequent IP traffic between the sites. The SonicWall security appliance at the remote site (Remote Gateway) passes DHCP broadcast packets through its VPN tunnel. The SonicWall security appliance at the central site (Central Gateway) relays DHCP packets from the client on the remote network to the DHCP server on the central site.