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Appendix B Using serial PPP 171
Nortel VPN Router Troubleshooting
Action:
Make sure that the modem that is connected to the VPN Router has hardware flow
control enabled.
PPP option settings
The following settings describe the VPN Router’s behavior when negotiating
serial PPP.
For IP:
• IP Address negotiation is enabled.
• The VPN Router needs the peer’s IP address to make a connection.
• The peer should not suggest an IP address for the VPN Router. The VPN
Router uses its management IP address.
• The VPN Router rejects VJ compression.
• The VPN Router rejects VJ connection ID compression.
For LCP:
• The VPN Router does not initiate a connection.
• The VPN Router accepts magic number negotiation.
• The VPN Router rejects address control field compression.
• The VPN Router rejects protocol field compression.
• The VPN Router does not allow asynchronous character map to be negotiated.
• The VPN Router accepts Maximum Receive Unit (MRU) requests.
For authentication:
• The VPN Router does not authenticate itself to a peer with PAP upon request.
• The VPN Router requires that peers perform PAP authentication using the
administrator’s login and password.
• The VPN Router does not authenticate itself to a peer with the Challenge
Handshake Authentication Protocol (CHAP) upon request.
• The VPN Router does not require that the peer authenticate itself with CHAP.