Cisco 771 M ISDN Router

Shortcut: Sample configuration. Deutsche Version.

Troubleshooters odyssey

Having found my router's picture linked in a (probably) Malaysian discussion board, it seems the topic may be of interest beyond Germany, too. So, I decided to provide the basics in English, too, as far as I am able to ...

The Cisco 770 ISDN routers come with loads of documentation on CD. However, not even the included Cisco "700-Fast-Step" application succeeded to connect my router. With some help from the command reference (PDF, the one linked here refers to Software Release 4.4-7 as of June 2003), I figured out a configuration script that worked for me. At the Cisco website, you may find further documentation. Unfortunately the reference linked above is not available as a single file, but in several ones. Cisco support stated that these routers are only labled products, their OS has about nothing in common with the Cisco IOS. Cisco for some time already counts the 700 ISDN access routers among the products that have the "End-of-sale" or "End-of-life" status.

Please keep in mind: This script is adapted to the German ISDN net, I do not have any information about necessary settings for other ISDN nets, except that you probably have to use the "SET SWITCH <your net type>" command to adjust that. Above that, I do not know how to configure the (probably similar) Cisco 760 routers. I do not even have time to reply to all those asking me for help to configure their routers.

To configure the Cisco 771 M ISDN router, you need a PC with COM port (thus, my G4 Mac did not do), like e.g. a Win95 (or newer) or Linux machine. With Win95, connect using e.g. the included Hyperterminal application. In spite of the clues given in Cisco documentation, I could only connect using the "no protocol" setting in Hyperterminal. Having connected successfully, you find a prompt in Hyperterminal to communicate with the router's OS. You will have to learn about various levels or modes which the router can be configured in. An older version of the Cisco Command reference (referring to Software Release 4.1(2) as of April 2, 1998), which at least came as one single PDF file, states:

"There are two modes at which you can set parameters, the system mode and the system mode."

Really helpful, isn't it? Now, they presumably wanted to say "system mode" and "profile mode", as the router can save several profiles: There are default levels called "User LAN", "User Standard" or "User Internal", you create another user named at your own choice. You may change between system, profile, LAN etc. level by typing "cd <level or profile name>" on the command line. Dig into the Command reference to find more information on how to navigate the OS or how to tickle some system information out of it.

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Sample configuration Cisco 771 M ISDN router

No DHCP, multilink capability/BACP (bandwidth allocation control protocol for automated shift to multiple channels on demand) disabled. Where you see a red figure to the right, you find an explanation below: You (may) have to enter YOUR settings here.

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SET SCREENLENGTH 20
SET COUNTRYGROUP 5
SET LAN MODE ANY
SET WAN MODE ONLY
SET AGE OFF
SET MULTIDESTINATION OFF
SET SWITCH NET3 *[1]
SET ALAWVOICE ON
SET INTERNALTONES NONE
SET 1 DIRECTORYNUMBER xxxxxx *[2]
SET 1 DELAY 30
SET 2 DELAY 30
SET BRIDGING OFF
SET LEARN ON
SET PASSTHRU OFF
SET SPEED AUTO
SET PLAN NORMAL
SET D AUTO OFF
SET 1 AUTO ON
SET 2 AUTO ON
SET 1 NUMBER xxxxxxx *[3]
SET 2 NUMBER xxxxxxx
SET AODI OFF
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 ajo *[4]
LOG CALLS TIME VERBOSE
SET UNICASTFILTER OFF
DEMAND D THRESHOLD 0
DEMAND 1 THRESHOLD 0
DEMAND 2 THRESHOLD 48
DEMAND D DURATION 1
DEMAND 1 DURATION 1
DEMAND 2 DURATION 1
DEMAND D SOURCE LAN
DEMAND 1 SOURCE LAN
DEMAND 2 SOURCE BOTH
TIMEOUT D THRESHOLD 0
TIMEOUT 1 THRESHOLD 0
TIMEOUT 2 THRESHOLD 48
TIMEOUT D DURATION 0
TIMEOUT 1 DURATION 15
TIMEOUT 2 DURATION 15
TIMEOUT D SOURCE LAN
TIMEOUT 1 SOURCE LAN
TIMEOUT 2 SOURCE BOTH
SET AOCDTIMEOUT OFF
SET PASSWORD SYSTEM ENCRYPTED 04c49599
SET REMOTEACCESS PROTECTED
SET LOCALACCESS ON
SET LOGOUT 5
SET CALLERID OFF
SET PPP AUTHENTICATION IN CHAP PAP
SET PPP CHAPREFUSE NONE
SET PPP CHAPALLOW MULTIHOST OFF
SET PPP AUTHENTICATION OUT NONE
SET PPP AUTHENTICATION ACCEPT EITHER
SET PPP TAS CLIENT 0.0.0.0
SET PPP TAS CHAPSECRET LOCAL ON
SET PPP SECRET CLIENT ENCRYPTED 139d82
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 OFF
SET PPP MULTILINK PPPHEADER ON
SET COMPRESSION STAC
SET PPP BACP OFF
SET PPP ADDRESS NEGOTIATION LOCAL OFF
SET PPP IP NETMASK LOCAL OFF
SET IP PAT UDPTIMEOUT 5
SET IP PAT TCPTIMEOUT 30
SET IP RIP TIME 30
SET X25 LIC 0
SET X25 HIC 0
SET X25 LTC 0
SET X25 HTC 0
SET X25 LOC 1024
SET X25 HOC 1024
SET CALLDURATION 0
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 TPAD PARITY NONE
SET X25D TEI 0
SET X25D X121HOST
SET CALLTIME VOICE INCOMING OFF
SET CALLTIME VOICE OUTGOING OFF
SET CALLTIME DATA INCOMING OFF
SET CALLTIME DATA OUTGOING OFF
SET USER LAN
SET BRIDGING OFF
SET IP ROUTING ON
SET IP ADDRESS xxx.xxx.xxx.xxx *[5]
SET IP NETMASK 255.255.255.0
SET IP FRAMING ETHERNET_II
SET IP PROPAGATE ON
SET IP COST 1
SET IP RIP RECEIVE V1
SET IP RIP UPDATE LIN
SET IP RIP VERSION 1
SET IP FILTER UDP IN SOURCE 0.0.0.0/0:137-138 BLOCK
SET IP FILTER TCP IN SOURCE 0.0.0.0/0:139 BLOCK
SET USER Internal
SET PPP BACP ON
SET IP ROUTING ON
SET IP ADDRESS 0.0.0.0
SET IP NETMASK 0.0.0.0
SET IP FRAMING ETHERNET_II
SET IP RIP RECEIVE V1
SET IP RIP UPDATE OFF
SET IP RIP VERSION 1
SET USER Standard
SET PROFILE ID 000000000000
SET PROFILE POWERUP ACTIVATE
SET PROFILE DISCONNECT KEEP
SET PPP BACP OFF
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 XXX *[6]
SET PROFILE ID 000000000000
SET PROFILE POWERUP ACTIVATE
SET PROFILE DISCONNECT KEEP
SET BRIDGING OFF
SET 1 NUMBER xxxxxxx *[7]
SET 2 NUMBER xxxxxxx
SET PPP AUTHENTICATION ACCEPT EITHER
SET PPP CLIENTNAME XXX *[8]
SET PPP PASSWORD CLIENT ENCRYPTED 05263521
SET PPP SECRET CLIENT ENCRYPTED 10633a37
SET PPP PASSWORD HOST ENCRYPTED 11242a2b
SET PPP SECRET HOST ENCRYPTED 080c7f60
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 ON COST 1
SET IP FILTER UDP IN SOURCE 0.0.0.0/0:137-138 BLOCK
SET IP FILTER TCP IN SOURCE 0.0.0.0/0:139 BLOCK
CD
SET BUTTON Standard
SET SERIALPORT CONFIG
LOGOUT
ajo>

Explanations:

*[1]: Set to your net type, see reference
*[2]: Your own phone number, as assigned to the router (without regional code, at least in Germany)
*[3], *[7]: Access number as given to you from your provider
*[4]: System name as you please
*[5]: Router IP address/netmask for LAN
*[6]: Profile name, as you determine it
*[8]: User name for dial-in (can be prescribed by provider)

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