Compatible Systems 5.4 - Manual (Page 164)

158 Chapter 10 - WAN Link Protocols
Allow Dial In
This checkbox tells the router whether it should accept incoming on-demand
PPP connections from other routers (or end-node clients). This checkbox can
only be set if the Link Type is On Demand PPP Link.
• If checked, then incoming PPP connections will be accepted.
• If unchecked, then incoming PPP connections will be rejected.
Always Keep Link Up
This checkbox tells the router whether it should always initiate a dialing
sequence if there is no connection established for this interface. This
checkbox can only be set if the Allow Dial Out checkbox is checked and the
Drop Link If Inactive For checkbox is unchecked.
• If checked, then whenever the connection for this interface is down, a
dialing sequence will be initiated.
• If unchecked, then a dialing sequence will only be initiated when there
is network traffic which needs to be forwarded out this interface.
Drop Link If Inactive For
This checkbox and edit box tell the router how long it should wait once all
traffic has been forwarded across the connection before dropping the link. If
additional traffic is forwarded from another interface on the router before the
link has been dropped, the timer will be reset.
• If checked, then the link will be dropped after the specified number of
minutes have passed with no packets being forwarded out this interface.
The maximum value is 65535 minutes. The default value is 10 minutes.
• If unchecked, then the link will only be dropped when the router (or
remote end-node client) drops its end of the connection.
v Note: There are certain maintenance packets for each protocol (IP, IPX,
etc.) which will not cause the inactivity timer to be reset. This is a security
measure that keeps intruders out and allows on-demand links to be useful.
Dialing Method
This pull-down menu lets you pick the dialing method which will be used for
on-demand dialing on this interface. Which dialing method is used depends
on the type of equipment being dialed. In general, asynchronous devices, such
as modems, use AT style dialing. Synchronous devices, such as dialed
CSU/DSU’s and ISDN terminal adapters, generally use V.25bis style dialing.
• The AT dialing specification is the industry standard for dialing
modems. If you select this option, make sure you enter AT-style