Nortel Networks NN46110-602 - Manual (Page 82)

82 Chapter 4 Troubleshooting
NN46110-602
4 If the PPP layer still does not come up, enable the interface debugger to
generate large amounts of packet traces in the event log. Report this
information to Nortel Customer Support for further diagnosis.
Hardware encryption accelerator connectivity
If the hardware encryption accelerator fails, all sessions are automatically moved
over so that the software can handle them.
Solving performance problems
This section describes ways to improve the performance of the remote workstation
connection to the corporate network through a VPN Router. It also includes
Microsoft networking and client setup and operation tips.
Eliminating modem errors
Modem hardware errors can impact performance when connecting to your
corporate network over a dial-up connection. If modem hardware errors are
occurring, try the following techniques to correct these errors and improve
performance:
• Adjust the modem speed—If the speed of the modem is set too high, it can
cause hardware overruns. Reset the modem speed to match the real speed of
the modem.
• Disable hardware compression—The data passed through the extranet
connection is encrypted, and encrypted data is typically not compressible.
Depending on the algorithm the modem uses to compress the encrypted
(non-compressible) data, the data can expand in size and overrun the modem's
buffers.
Performance tips for configuring Microsoft networking
For Microsoft networking to work as designed over the extranet, each of the
following components, if configured, must work together: