User's Manual Part 4

Page 52 SonicWALL SonicOS Standard Administrator’s Guide
8. Enter the IP address of a relay server in the Relay IP Address (Optional) field.
To edit an entry in the IP Address table, click Edit. To delete a DHCP Server, highlight the entry in the
IP Address table, and click Delete. Click Delete All to delete all entries.
Configuring DHCP over VPN Remote Gateway
1. Select Remote Gateway from the DHCP Relay Mode menu.
2. Click Configure. The DHCP over VPN Configuration window is displayed.
3. Select the VPN Security Association to be used for the VPN tunnel from the Relay DHCP through
this VPN Tunnel menu.
Alert! Only VPN Security Associations using IKE and terminate on the LAN appear in the Obtain using DHCP
through this VPN Tunnel.
4. The Relay IP address is used in place of the Central Gateway address, and must be reserved in the
DHCP scope on the DHCP server. The Relay IP address can also be used to manage the SonicWALL
remotely through the VPN tunnel behind the Central Gateway.
5. The Remote Management IP Address, if entered, can be used to manage the SonicWALL remotely
through the VPN tunnel behind the Central Gateway.
6. If you enable Block traffic through tunnel when IP spoof detected, the SonicWALL blocks any
traffic across the VPN tunnel that is spoofing an authenticated user’s IP address. If you have any static
devices, however, you must ensure that the correct Ethernet address is entered for the device. The
Ethernet address is used as part of the identification process, and an incorrect Ethernet address can
cause the SonicWALL to respond to IP spoofs.
7. If the VPN tunnel is disrupted, temporary DHCP leases can be obtained from the local DHCP server.
Once the tunnel is again active, the local DHCP server stops issuing leases. Enable the Obtain
temporary lease from local DHCP server if tunnel is down check box. By enabling this check box,
you have a failover option in case the tunnel ceases to function. If you want to allow temporary leases
for a certain time period, enter the number of minutes for the temporary lease in the Temporary
Lease Time box. The default value is two (2) minutes.
Device Configuration
8. To configure Static Devices on the LAN, click Add, and enter the IP address of the device in the IP
Address field and then enter the Ethernet Address of the device in the Ethernet Address field. An