Misc Notes:
NAT Limitations The 675 seems to have a problem storing a large number of NAT entries. Although you can enter and use a large number of entries, those entries may be lost if the unit is rebooted. If this happens, telnet, web, and tftp get set back to their default values. To date, I've been able to get between 90 and 140 entries to survive a reboot. Make sure you keep a copy of your NAT entries and other configurations in a text file in case they need to be re-entered.
Password Recovery
If you happen to forget your exec and/or enable passwords you can recover them using MONITOR mode:

Connect your PC's serial port to the 675's management port.

Remove, then restore power to the 675.

As soon as the 675's red ALARM light comes on, hit Ctrl-C a few times to enter ROM monitor mode.

Enter the following to dump 400 bytes of data starting at address fef80030. You can adjust the number of words if you need a smaller or larger dump:

db fef80030 400

The right hand column is the ASCII dump of your NVRAM. Look for Root Password = and Enable Password = . The next ten characters after each are your EXEC and ENABLE passwords, only shifted back by two letters (disregard any trailing ".").

This means that a = c, b = d, . = 0, / = 1, 0 = 2, etc. (you may want to consult an ASCII chart). For example, using this key, if the characters from the dump were /KwN_qqub your password would be 1MyPasswd.

Reboot the 675 to exit monitor mode.

rb (reboot)
Password Reset
Caution: This procedure will not only reset your EXEC and/or ENABLE passwords, it will also reset your configuration.

Connect your PC's serial port to the 675's management port.

Remove, then restore power to the 675.

As soon as the 675's red ALARM light comes on, hit Ctrl-C to enter ROM monitor mode.

Enter the following two commands:

es 6 (erase sector 6)
rb (reboot)

Once the unit reboots you can re-enter your user info.

Process Status Report This command will show the 675's software modules and the status of each:

    show ps
Line Quality Tweaks You can attempt to increase your line quality by tweaking the following settings.

Note: Qwest Tech Support has asked that these txpower tweaks not be used. According to their research, using these tweaks can cause problems for other DSL customers by inducing noise on their lines.

Note: Each time you issue one of these commands, retrain the connection and recheck the line quality.

    set int wan0 retrain
    show int wan0 (once the WAN-LNK light goes solid)

Adjust your settings, testing them after each change.

    set int wan0 txpower X          - where X is 1 (full) to 6 (-15dB)
    set int wan0 remote txpower X   - where X is 1 (full) to 6 (-15dB)
    set int wan0 margin X           - where X is 1 (-3dB) to 13 (+9dB)
    set int wan0 remote margin X    - where X is 1 (-3dB) to 13 (+9dB)

* txpower adjusts amplification at sender end.
* margin adjusts amplification at receiver end (thus also amplifies noise). Its usually best to leave this alone.

Experiment with these settings until you get the highest line quality numbers. The maximum is 46dB. The lowest acceptable is 18dB. The 675 will automatically retrain if it goes below 16dB.

Remember to write the settings once you get it set the way you want it

    write

If you are having problems with the 675 retraining too often and can't resolve the line quality issues with the above tweaks, you can force the 675 not to retrain

    set int wan0 stay
Another command that may help "RS" errors is
    set int wan0 intr 2   (ADSL Interleave)
Traceroute Traceroute does not function properly with CBOS 2.0.1 or 2.1.0. If you need traceroute, you'll need to upgrade your CBOS to 2.2.

Note: A manual traceroute from a Unix/Linux machine requires the "-I" option. This uses the "ICMP" (lower level protocol) echo instead of "UDP".