Digi TransPort WR31 User Manual page 310

Configure network interfaces
Attempt to re-connect after s seconds
The length of time, in seconds, the router should wait after an Always on PPP connection has
been terminated before trying to re-establish the link.
If a PPP interface that would be inhibited by this PPP is connected, attempt reconnection
after s seconds
The value in this setting takes precedence over the previous parameter when another PPP
instance that is usually inhibited by this one is connected. You can use this parameter to reduce
the connection retry rate when a lower priority PPP instance is connected.
Wait s seconds after power-up before activating this interface
The initial delay the router applies before activating the PPP instance after power-up. After the
initial power-up delay the normal always-on activation timers apply. If set to 0, no delay is
applied.
Keep this interface up for at least s seconds
The minimum period that the PPP interface should remain available. This means that even if the
link becomes inactive before this period expires, the connection will remain open.
Enable Multilink PPP on this interface
When enabled, enables the multilink PPP capability of the router. (See above for configuration
details).
Click here to assign a timeband to this interface
Clicking this link redirects the browser to the timeband configuration page Configuration >
Network > Timebands.
Add a route to a.b.c.d if the peer's IP address is not negotiated
Normally, the IP address for a device connecting to a remote peer is assigned by the remote
peer. If this is not the case then the router will need a route to the remote peer. This setting is set
to the IP address of the remote peer so that it can be added to the routing table.
Enable DNS inbound blocking
Enables or disables blocking DNS requests on the PPP interface, to prevent the router from
responding to DNS requests over this interface.
Digi TransPort WR Routers User Guide
Configure Advanced interfaces settings: External modems and PPP
310