Cisco 675 or 678

Click to enter the Cisco's web interface, but you have no need to. Web interface is not the way to set it up. The way to do everything with this modem is the mighty CBOS Command Line.


If your Cisco router/modem has a constant "red light" coming from inside, it cannot be repaired and it has been classified a paper weight by the Cisco consortium. This is not the red Alarm light on the front panel.

Click here for way more information than you probably wanted on the lights.

Set-up Procedure and Useful Commands:

Setting Up a New Routed Connection From Scratch

Usually the customer will know how to log into their Cisco without you even helping them. If not, you can do this through the management program that is sitting on their desktop with a Cisco icon. If they don't have that, you can do it with Hyperterminal (Programs, Accessories, Communications, Hyperterminal). Call the connection Cisco, connect using COM 1, and change bit rate down to 9600. If the dog ate their management cable, you can do it through telnet (telnet, but if you need to do it through telnet DO NOT REBOOT UNTIL YOU SET ENABLE AND EXEC PASSWORDS OR YOU WILL NEVER BE ABLE TO LOG IN FROM TELNET AGAIN. OK? So just skip the first reboot step in the instructions below in that case and add a step to set the passwords again.

cbos> enable 
cbos# set nvram erase 
cbos# write 
cbos# **Remember not to do this if you're connected through telnet.** reboot  
Password:  (unless you’ve set an exec password)
cbos> enable 
Password:  (will bring up cbos# unless you’ve set an
enable password)
cbos# set ppp wan0-0 ipcp 
cbos# set ppp wan0-0 dns 
cbos# set ppp wan0-0 login "the customer's USERNAME" 
cbos# set ppp wan0-0 password "the customer's PASSWORD" 
cbos# set int wan0-0 disable 
cbos# set int wan0-0 vpi 0 vci 32  (or 35 for Visionary DSL aka "Beyond Extreme")
cbos# set int wan0-0 enable 
cbos# set ppp restart enable  (ONLY for 675)
cbos# set dhcp server enable 
cbos# set nat enable 
cbos# write 
cbos# reboot 

Changing VCI Settings:

1. To make sure the wan0-0 connection remains closed during configuration, enter: set interface wan0-0 disable

2. To set the VCI number to 35, enter: set interface wan0-0 vci 35
Note If you try to enter the command set interface wan0-0 on a connection that is already open, the system prompts you to close that connection before you change the VCI setting. To do this, enter the command set interface wan0-0 close.

3. To enable the wan0-0 connection, enter: set interface wan0-0 enable

4. To begin using this connection with the new settings, enter: set interface wan0-0 open

5. To save the new WAN port configuration, enter: write

6. To exit CBOS, enter: quit

To See What the VPI/VCI Is

enter: show int wan0-0
Then comes up:
cbos#show int wan0-0
WAN0-0 ATM Logical Port
PVC (VPI 0, VCI 35) is open.
ScalaRate set to Auto
AAL 5 UBR Traffic
PPP LCP State: Request Sent
PPP NCP State (IP Routing): Starting
PPP MRU: 2048 HDLC Framing: enabled MPOA Mode: VC Mux
PPP Login:
Authentication Type: Autodetecting/PAP
RADIUS: disabled
PPP Tx: 72 Rx: 0
Dest IP:
Dest Mask:
IP Port Enabled

To Check Speed and Error Rate

sh int wan0 It will bring up a bunch of stuff. Down about line 7 and 8 is:
Downstream Data Rate: XXXX Kbps
Upstream Data Rate: XXX Kbps
Then down at the bottom it shows errors:
Local Counters:
Interleaved RS Corrected Bytes: 4842
Interleaved Symbols with CRC Errors: 2
No Cell Delineation Interleaved: 195968
Out of Cell Delineation Interleaved: 65280
Header Error Check Counter Interleaved: 32768
Count of Severely Errored Frames: 32768
Count of Loss of Signal Frames: 0
Remote Counters:
Interleaved RS Corrected Bytes: 18739
Interleaved Symbols with CRC Errors: 0
No Cell Del
The above example is typical of a connection that's working OK. If, for instance, Interleaved Symbols with CRC Errors is 2,000,000, that may indicate a noise/interference problem, depending on how long the modem has been up. Reboot the modem to clear the counters and see if the error counters "increment" (that is, continue to go up rapidly).

Another useful command

cbos#show ppp
wan0-0 00/35 Request Sent 2048 disabled 90 0

Miscellaneous Marginally Useful Facts:

There should be a blue-gray management cable plugged in from the modem to the computer. People who have these old Ciscos are generally reasonably knowledgeable in my experience and will know how to log into the management interface without any help. So you will just have to tell them what commands to put in.

Web interface: You've got to enable it from the command line first before it will even work. The command is set web enabled.
Default LAN Address:
User name to get into the web interface: exec or enable. If you log in as Exec you are limited as to what you can do and change; with Enable you can change things to your heart's content.
Password for web interface: Your exec or enable password.


The User Manual for Cisco 600 Series DSL Modems
Qwest's Help Page for the Cisco 675/678
Guide to the CBOS. This tells you all the commands for the command line system this modem uses.