200 CHAPTER 6: DCC C ONFIGURATION[Router-Serial2/0] link-protocol ppp[Router-Serial2/0] ppp authentication-mode pap[Router-Serial2/0] ppp pap local-user Sysname password simple Sysname# Configure the interface to assign an IP address to the remote end.[Router-Serial2/0] remote address 100.1.1.2# Specify interface Serial 2/0 as the PPP callback server, and set the callbackreference to user mode. In this case, DCC uses the dial string corresponding to theusername configured in the dialer route command to place return calls.[Router-Serial2/0] ppp callback server[Router-Serial2/0] dialer callback-center user# Enable C-DCC on interface Serial 2/0 and configure C-DCC parameters.[Router-Serial2/0] dialer enable-circular[Router-Serial2/0] dialer-group 1[Router-Serial2/0] dialer route ip 100.1.1.2 user userpc 8810048[Router-Serial2/0] quit# Configure the user interface to be used and enable modem dialup on it.[Router] user-interface tty1[Router-ui-tty1] modem bothNT Server-to-RouterCallback with DCCNetwork requirementsFigure 31 presents a scenario where:■ Router and NT Server are interconnected via modems across a PSTN network.■ NT Server is assigned the IP address of 100.1.1.254/24.■ Router accepts the address assigned by NT Server.Configure PPP callback with C-DCC between Router and PC, specifying Router asthe callback client and NT Server as the callback server to make return callsaccording to dialer routes.Network diagramFigure 31 Network diagram for NT server-to-router callback with DCCConfiguration procedure1 Configure Router# Configure a dial access control rule for dialer access group 1; create a local useraccount usernt for NT Server and configure PPP authentication for the account.PSTNModemRouterNT ServerModem100 .1 .1.254 /248810048 8810052S2 /0100 .1.1.1/24Callback client Callback server
