Nortel Networks NN46110-602 - Manual (Page 169)

Appendix B Using serial PPP 169
Nortel VPN Router Troubleshooting
Dialing in to the VPN Router
Use the standard dial-up networking procedure to connect to the VPN Router.
After connecting, you can then manage the VPN Router using either Telnet (for
the command line interface) or the browser-based GUI. Use the VPN Router’s
management IP address for the Telnet session or the browser’s destination URL.
Troubleshooting Serial PPP
When the serial port is set up for PPP only, you can still do inband Web
management.
Cause:
I have a modem connected, but I cannot get a PPP connection.
Actions:
• Verify that the modem supports the VPN Router’s selected baud rate. Most
connection problems occur because the modem is not operating at the same
baud rate as the VPN Router. For example, a 3Com/US Robotics 56 Kb/s
modem’s default baud rate when attempting to establish a connection to the
VPN Router is 38400, but the VPN Router’s default baud rate is 9600.
• Verify that the VPN Router is set up for PPP over the serial port. You can
verify this by checking the settings in the Web interface (System
> Settings).
• Verify that you clicked Reset from the Web interface when making changes to
the window (System > System Settings). This guarantees the serial port resets
and initializes the modem. This is especially true with a modem connected to
a VPN Router that was restarted.
• Check the event log for failures.
• Make sure you have the correct dial-up networking settings. See the section,
“Setting up a Dial-Up Networking connection .”
• Make sure you have the remote modem set to auto answer and that it is in
smart mode so that it can respond to the AT command set.
• Verify that the auto detection did not fail, and that the VPN Router is in serial
menu mode.