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DSU RouteFinder User Guide
PPP Port Setup
The PPP Port Setup dialog box controls the WAN port protocol, dial on demand, and remote port
setup. The WAN port protocol can be either Point-to-Point Protocol (PPP) or Serial Line Internet
Protocol (SLIP). Of these two protocols, PPP is the more robust as it allows the endpoints to
negotiate the use of the link and protocol parameters in a standardized way and also allows for
standardized encapsulation of the packets. SLIP is an older protocol which requires manual
authentication using a script.
PPP is the default protocol. The PPP software in the DSU RouteFinder internally negotiates the
use of a suitable authentication protocol (PAP or CHAP) with the remote router or remote access
client software. When either PAP or CHAP (or both) is enabled, the DSU RouteFinder expects
the peer (the client on the other side of the WAN link) to be configured with a User Name and
Password combination that is in the DSU RouteFinder's User Database. The User Name and
Password are both ASCII character strings that can be up to 30 characters long. However, for
router-to-router connections, authentication is normally not used and the User Name and
Password fields are empty.
The Periodic Timer option shows the interval between authentication checks. The
recommended value is 60 seconds. The Number of Retries option, with a recommended value
of 5, refers to the number of retries during each PAP or CHAP authentication check.
If SLIP is to be used on WAN 2 (the only WAN port that can be configured as a dial-out port),
then select the SLIP Enable option on this tab and PPP will be disabled automatically. If the TCP/
IP header is to be compressed using VJC compression, then check the CSLIP (Van Jacobson
Compression) option. (Note: on answering WAN ports, the DSU RouteFinder can detect the
type of connection -- PPP or SLIP.)
You can set up the DSU RouteFinder to bring down the connection on the WAN link when there
is no real data traffic on the line; the router will then automatically bring up the WAN link when
data is available to go across the link.
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MTASR2-201
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