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SonicOS Enhanced 4.0 Administrator Guide
CHAPTER 50
Chapter 50: Configuring DHCP Over VPN
VPN > DHCP over VPN
The VPN > DHCP over VPN page allows you to configure a SonicWALL security appliance to
obtain an IP address lease from a DHCP server at the other end of a VPN tunnel. In some
network deployments, it is desirable to have all VPN networks on one logical IP subnet, and
create the appearance of all VPN networks residing in one IP subnet address space. This
facilitates IP address administration for the networks using VPN tunnels.
DHCP Relay Mode
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.