Digi TransPort WR11 User Manual page 368

Configuring network interfaces
if it has been idle for h hrs m mins s secs
The router deactivates the PPP instance after the time specified in these text boxes if it
detects that the link has not seen traffic.
Alternative idle timer for static routes s seconds
An alternative inactivity timeout for use in conjunction with the Make PPP n interface use the
alternative idle timeout when this route becomes available parameter on the
Configuration > Network > IP Routing/Forwarding > Static Routes > Routes n > Advanced
web page. The router uses this timeout until the PPP instance next deactivates only. After
that, it uses the normal timeout value.
If the link has not received any packets for s seconds
The amount of time the router waits without receiving any PPP packets before disconnecting.
The timer is reset with each received PPP packet.
if the negotiation is not complete in s seconds
The maximum time, in seconds, allowed for the PPP negotiation to complete. If negotiations
have not completed within this period, the interface is deactivated.
Enable NAT on this interface
When enabled, causes the router to apply Network Address Translation (NAT) to IP packets on
this interface. When enabled, the following additional parameters appear:
IP address/IP address and Port
These radio buttons select whether IP address translation only should be applied or whether
port number translation should also be applied to IP packets.
NAT Source IP address a.b.c.d
The IP address of the interface to use as the source address in IP packets crossing the NAT
interface.
Enable IPsec on this interface
When enabled, causes the router to use the IPsec protocol to secure the connection. Enabling
this setting displays the following additional parameters:
Keep Security Associations (SAs) when this PSTN interface is disconnected
When enabled, causes the router to maintain (such as not flush) the SA when the interface
becomes disconnected. The normal behavior is to remove the SAs when the interface becomes
disconnected.
Use interface x,y for the source IP address of IPsec packets
If it is required to use another interface (such as 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
Enabling this setting causes the router to apply the firewall settings to traffic using this
interface. When debugging connections issues it is often helpful to make sure this setting is
Digi TransPort® Routers User Guide
Configure PPP and external modems
368