User`s guide

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Use interface x,y for the source IP address of IPsec packets
If it is required to use another interface (i.e. not the interface currently being configured)
as the source address for IPsec packets, this may be achieved by selecting the desired
interface from the drop-down list and typing the desired interface instance number into
the adjacent text box.
Enable the firewall on this interface
Checking this checkbox causes the router to apply the firewall settings to traffic using this
interface. When debugging connections issues it is often helpful to ensure that this checkbox
is NOT checked, as incorrect firewall rules will prevent a connection from passing network
traffic. If the connection works when the firewall is turned off but fails when turned on, a
good place to start checking parameters would be in the firewall settings page,
Configuration – Security > Firewall.