Cisco 766M Configuration

This document will detail the configuration of the Cisco 766M router for connection to MCI's InfoLink system. The 766M is a Small Office/Home Office (SOHO) router which incorporates an NT1, 10-Base-T Ethernet port, U and S/T ISDN interfaces and two analog POTS ports.

Load the Remote Office software

The first step in configuring the Cisco 766M is to ensure that the proper software has been loaded. You will need the remote office version of the software in order to permit the specification of STAC compression. The configuration presented here has been tested with version c760-in.r.US 4.1(2) of the software. Licensed customers can download this image from Cisco.

Reset Router Configuration

The first configuration command will reset the router to the default configuration so be sure to backup any existing configuration information. Use the console cable supplied with the router to connect to a serial port on a convenient host. If you use Windows 95, you can use the HyperTerminal application to communicate directly with the router. Make a connection using a speed of 9600 baud, 8 bits, no parity, and press enter to receive a prompt. Enter the following command.

set def

Set Global Parameters

Enter the following commands.

cd
set systemname username
set switch switchtype
set 1 spid xxxxxxxxxxxxxx
set 2 spid xxxxxxxxxxxxxx
set 1 directory xxxxxxx
set 2 directory xxxxxxx
set ppp authentication outgoing none
set ppp authentication incoming chap
set compression stac

The username is your InfoLink username; it should be in the form username-ISDN. The switchtype should be either 5ess if connected to an AT&T 5ESS or dms if connected to a Northern Telecom DMS-100 switch. Your Telco should have provided the switch type information when they installed your ISDN service. The service protocol identifiers (SPIDs) should have also been provided by your Telco. Please note that SPIDs are not required if connecting to an AT&T 5ESS and so the specification can be omitted. The dialed number or directory number entries are the seven-digit local telephone numbers provided by the Telco.

Configure Ethernet Port

Enter the following commands.

cd lan
set bridging off
set ip routing on
set ip address x.x.x.x
set ip netmask x.x.x.x

The IP address chosen is unimportant due to the use of dynamic addressing and port address translation. The only requirement is that it be on the same subnet as the hosts on the local subnet. It is perfectly acceptable to use an unregistered address or a restricted one, such as 10.1.1.1. This address should be specified as the default destination for the connected hosts. Similarly, the only requirement for the netmask is that it be the same as the connected hosts. I prefer to use a netmask of 255.255.255.0 as it permits up to 253 devices on the subnet.

Configure Connection

Enter the following commands.

set user MCI
set ppp clientname username
set ppp password client
set ppp secret client
set bridging off
set ip routing on
set ip rip update off
set ip route destination 0.0.0.0/0 gateway 0.0.0.0
set 1 number 18888515373
set 2 number 18888515373
set ip pat on
set ppp address negotiation local on
set timeout x

The username is the same as the one specified earlier. Even though we specified CHAP as the authentication protocol, Cisco recommends defining both PAP and CHAP passwords. You will be prompted for your InfoLink ISDN account password twice; the second time is for verification purposes. The timeout value represents the number of seconds of inactivity before the link is disconnected. It should be set to the lowest reasonable value in order to minimize connection time. If you are just using the connection for FTP transfers and the like, you can set the timeout to a very low value such as 60 seconds. If you are browsing the web, and reading pages, you will probably want to set a higher timeout value, such as 300 seconds or 5 minutes. If you are using a protocol like telnet, you probably want an even higher timeout, such as 600 seconds or 10 minutes.

Enable the Configuration

Unlike IOS, where changes take effect immediately, you will have to reboot the 766M in order to have the new configuration take effect. Enter the following command.

reboot

Verify Configuration

Enter the following command.
upload

You should see a configuration similar to the following.

SET SCREENLENGTH 23
SET COUNTRYGROUP 1
SET LAN MODE ANY
SET WAN MODE ONLY
SET AGE OFF
SET MULTIDESTINATION OFF
SET SWITCH DMS
SET 1 SPID xxxxxxxxxxxxxx
SET 1 DIRECTORYNUMBER xxxxxxx
SET 2 SPID xxxxxxxxxxxxxx
SET 2 DIRECTORYNUMBER xxxxxxx
SET AUTODETECTION OFF
SET CONFERENCE 60
SET TRANSFER 61
SET 1 DELAY 30
SET 2 DELAY 30
SET BRIDGING ON
SET LEARN ON
SET PASSTHRU OFF
SET SPEED AUTO
SET PLAN NORMAL
SET 1 AUTO ON
SET 2 AUTO ON
SET 1 NUMBER
SET 2 NUMBER
SET 1 BACKUPNUMBER
SET 2 BACKUPNUMBER
SET 1 RINGBACK
SET 2 RINGBACK
SET 1 CLIVALIDATENUMBER
SET 2 CLIVALIDATENUMBER
SET CLICALLBACK OFF
SET CLIAUTHENTICATION OFF
SET SYSTEMNAME username-ISDN
SET UNICASTFILTER OFF
DEMAND 1 THRESHOLD 0
DEMAND 2 THRESHOLD 48
DEMAND 1 DURATION 1
DEMAND 2 DURATION 1
DEMAND 1 SOURCE LAN
DEMAND 2 SOURCE BOTH
TIMEOUT 1 THRESHOLD 0
TIMEOUT 2 THRESHOLD 48
TIMEOUT 1 DURATION 0
TIMEOUT 2 DURATION 0
TIMEOUT 1 SOURCE LAN
TIMEOUT 2 SOURCE BOTH
SET REMOTEACCESS PROTECTED
SET LOCALACCESS ON
SET CLICKSTART ON
SET LOGOUT 5
SET CALLERID OFF
SET PPP AUTHENTICATION IN CHAP
SET PPP CHAPREFUSE NONE
SET PPP AUTHENTICATION OUT NONE
SET PPP SECRET CLIENT ENCRYPTED xxxxxxxxxxxxxxxxxx
SET PPP CALLBACK REQUEST OFF
SET PPP CALLBACK REPLY OFF
SET PPP NEGOTIATION INTEGRITY 10
SET PPP NEGOTIATION COUNT 10
SET PPP NEGOTIATION RETRY 3000
SET PPP TERMREQ COUNT 2
SET PPP MULTILINK ON
SET COMPRESSION STAC
SET PPP BACP ON
SET PPP ADDRESS NEGOTIATION LOCAL OFF
SET IP PAT UDPTIMEOUT 5
SET IP PAT TCPTIMEOUT 30
SET SNMP CONTACT ""
SET SNMP LOCATION ""
SET SNMP TRAP COLDSTART OFF
SET SNMP TRAP WARMSTART OFF
SET SNMP TRAP LINKDOWN OFF
SET SNMP TRAP LINKUP OFF
SET SNMP TRAP AUTHENTICATIONFAIL OFF
SET DHCP OFF
SET DHCP DOMAIN
SET DHCP NETBIOS_SCOPE
SET VOICEPRIORITY INCOMING INTERFACE PHONE1 ALWAYS
SET VOICEPRIORITY OUTGOING INTERFACE PHONE1 ALWAYS
SET CALLWAITING INTERFACE PHONE1 ON
SET VOICEPRIORITY INCOMING INTERFACE PHONE2 ALWAYS
SET VOICEPRIORITY OUTGOING INTERFACE PHONE2 ALWAYS
SET CALLWAITING INTERFACE PHONE2 ON
SET USER LAN
SET BRIDGING OFF
SET PPP CLIENTNAME username-ISDN
SET IP ROUTING ON
SET IP ADDRESS x.x.x.x
SET IP NETMASK x.x.x.x
SET IP FRAMING ETHERNET_II
SET IP PROPAGATE ON
SET IP COST 1
SET IP RIP RECEIVE V1
SET IP RIP UPDATE OFF
SET IP RIP VERSION 1
SET USER Internal
SET IP ROUTING OFF
SET IP FRAMING ETHERNET_II
SET USER Standard
SET PROFILE ID 000000000000
SET PROFILE POWERUP ACTIVATE
SET PROFILE DISCONNECT KEEP
SET IP ROUTING ON
SET IP ADDRESS 0.0.0.0
SET IP NETMASK 0.0.0.0
SET IP FRAMING NONE
SET IP RIP RECEIVE V1
SET IP RIP UPDATE OFF
SET IP RIP VERSION 1
SET USER MCI
SET PROFILE ID 000000000000
SET PROFILE POWERUP ACTIVATE
SET PROFILE DISCONNECT KEEP
SET BRIDGING OFF
SET 1 NUMBER 18888515373
SET 2 NUMBER 18888515373
SET PPP AUTHENTICATION OUT NONE
SET PPP CLIENTNAME username-ISDN
SET PPP PASSWORD CLIENT ENCRYPTED xxxxxxxxxxxxxxxxxx
SET PPP SECRET CLIENT ENCRYPTED xxxxxxxxxxxxxxxxxx
SET PPP ADDRESS NEGOTIATION LOCAL ON
SET IP ROUTING ON
SET IP ADDRESS 0.0.0.0
SET IP NETMASK 0.0.0.0
SET IP FRAMING NONE
SET IP RIP RECEIVE V1
SET IP RIP UPDATE OFF
SET IP RIP VERSION 1
SET IP PAT ON
SET IP ROUTE DEST 0.0.0.0/0 GATEWAY 0.0.0.0 PROPAGATE OFF COST 1
CD

The string username should be your actual InfoLink ISDN user name. Also, all the encrypted passwords and SPIDs have been disguised by being replaced with x's.

NOTES

This configuration gives precedence to incoming telephone calls. This is appropriate for the target market for this router. It permits the leveraging of an ISDN line to support both access to InfoLink and support of devices associated with the ISDN directory numbers. A customer could have an analog telephone connected to one of the POTS ports on the rear of the unit and a fax machine connected to the other. Incoming call appearances would cause the appropriate B channel to be released in order to accept the incoming call.

In regard to the IP address and netmask, the above notes document the use of the 10.1.1.0 network. I would generally set the IP address of the router to 10.1.1.254 with a netmask of 255.255.255.0. The host nodes, many of which could be connected through a hub, would have static IP addresses starting at 10.1.1.1 with a netmask of 255.255.255.0. The following diagram shows a complete sample SOHO configuration.

Copyright © 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 by Phil Selby