Cisco 67x Routed Mode Configuration

These configuration instructions keep the modem internally accessible as 10.0.0.1. This address will need to be entered as the gateway for every computer on your network.

With this configuration, the DHCP server built into the modem has been disabled and the modem will be unable to assign IP addresses to any computers on the network. Assign each computer on the network a static IP address. Use 10.0.0.2 as a starting point and go up sequentially from there.

The settings you will need to enter for each computer sharing the line can be found here. Because you are modifying settings on the modem, you should set your own computer up using the new network settings before you start changing settings on the modem. Otherwise, you will need to reboot your computer, losing the connection to the modem, before you can test the configuration.

Important: Your DSL circuit must be set up in RFC1483 Routing mode for this to work. If your ISP has your circuit in RFC1483 Bridging mode, your modem will need to be in bridging mode and these instructions will do nothing more than frustrate you.

Initial Hyperterm Set-Up

Use Hyperterm to connect to your modem. Set the connection to your COM (may be either COM1 or COM2, depending on your system configuration) or your modem port, using the following settings:

	Bits per second: 38400
	Data bits: 8
	Parity: None
	Stop Bits: 1
	Flow Control: None
	

Cisco 67x cbos Settings

Once you are connected - you will be prompted for a password - just hit enter unless you have already specified a password for your modem. Once you have logged in, type the following commands:

cbos> enable
cbos# set nvram erase
cbos# write
cbos# reboot

Now you need to wait for the Cisco modem to reboot. When it is finished rebooting, all passwords will have been cleared from the modem. At the password prompt, hit Enter then type:

cbos> enable
cbos# set br rfc1483 disable
cbos# set rfc1483 enable
cbos# set int eth0 mask 255.255.255.0
cbos# set int wan0-0 disable
cbos# set int wan0-0 dest <Gateway Address>
cbos# set int wan0-0 outside <Static IP Address>
cbos# set dhcp client disable
cbos# set dhcp server disable
cbos# set nat enable
cbos# set nat outside <Static IP Address>
cbos# set rip disable
cbos# write

The modem will often demand reboots where none are specified in these instructions. The additional reboots are not necessary but if they make you feel better, reboot. If you do reboot, just remember to enter (cbos#) mode before continuing.

If you are using a Cisco 678, and on a DMT line, you will need to enter the following commands (if Qwest sent you a Cisco 678 with your new DSL line, you most likely have a DMT line). If you are using a Cisco 675, skip the next two commands (setting the vci and vpi).

Cisco 678 Only

cbos# set int wan0-0 vci 32
cbos# set int wan0-0 vpi 0

Cisco 675 & 678

cbos# set int wan0-0 enable
cbos# write
cbos# reboot

cbos> enable
cbos# set web disable
cbos# set web port 8255 (any unassigned port number can be used instead of 8255)
cbos# set web remote 10.10.10.10
cbos# set pass exec <Enter a password here>
cbos# set pass enable <Enter a password here>
cbos# write
cbos# reboot

Close Hyperterm and try to ping the gateway address we gave you.

Networked Computer Settings

These are the settings you will use for each computer sharing the DSL connection:

IP Address: 10.0.0.x, where x is between 2 and 255
Subnet Mask: 255.255.255.0
Gateway: 10.0.0.1

DNS Server Addresses:
Primary/Preferred: 216.99.193.19
Secondary/Alternate: 216.99.193.2

Notes:

• Depending upon the version of CBOS installed on your modem, some of these commands may result in errors. If any commands do not "take", skip the command and continue on.
• set int wan0-0 outside is the most likely command to throw an error.
• If you think you have made a mistake, you can enter the command set nvram erase at the enable (cbos#) prompt and start over.