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SONICWALL SONICOS STANDARD 3.0 ADMINISTRATOR’S GUIDE
235
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
Select the VPN Security Association to be used for the VPN tunnel from the Relay DHCP through
this VPN Tunnel menu.
S
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.