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SONICWALL SONICOS ENHANCED 2.5 ADMINISTRATOR’S GUIDE
187
VPN > DHCP over VPN
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
In the General tab, select the VPN policy to be used to relay DHCP requests from the Central
Gateway. The VPN policy name is automatically displayed in the Relay DHCP through this VPN
Tunnel filed if the VPN policy has the setting Local network obtains IP addresses using DHCP
through this VPN Tunnel enabled.
S
Alert: Only VPN policies using IKE can be used as VPN tunnels for DHCP.
4
Select the interface the DHCP lease is bound from the DHCP lease bound to menu.
5
If you enter an IP address in the Relay IP address field, this IP address is used as the DHCP
Relay Agent IP address in place of the Central Gateway’s address, and must be reserved in the
DHCP scope on the DHCP server. This address can also be used to manage this SonicWALL
security appliance remotely through the VPN tunnel from behind the Central Gateway.
6
If you enter an IP address in the Remote Management IP Address field, this IP address is used
to manage the SonicWALL security appliance from behind the Central Gateway, and must be
reserved in the DHCP scope on the DHCP server.
7
If you enable Block traffic through tunnel when IP spoof detected, the SonicWALL security
appliance 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 typed for the device. The Ethernet address is used as part of the identification process,
and an incorrect Ethernet address can cause the SonicWALL security appliance to respond to IP
spoofs.
8
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, type the number of minutes for the temporary lease in
the Temporary Lease Time box. The default value is 2 minutes.