Ipcp Negotiation; Main Ip Address - Lucent Technologies PortMaster 4 Configuration Manual

Note – Ether0 or Ether1 must be configured for the PortMaster 4 to function normally.

IPCP Negotiation

During PPP negotiations for the IP Control Protocol (IPCP), the PortMaster 4 uses the
following order of precedence when choosing an IP address to identify itself:
1. The local IP address configured in the user profile, if set
2. The global reported IP address, if set
3. The first global local IP address, if set
4. The second global local IP address, if set
5. The third global local IP address, if set
6. The fourth global local IP address, if set
7. The IP address of Ether1
8. The IP address of Ether0

Main IP Address

When the PortMaster creates an IP packet, it must identify itself by placing a source
address in the IP header. To do so, the PortMaster chooses either the main IP address or
the nearest IP address, depending on the service used. The main IP address is chosen in
the following order, but the nearest IP address is the IP address of the interface on which
the packet exits the PortMaster 4:
1. The first global local IP address, if set
2. The second global local IP address, if set
3. The third global local IP address, if set
4. The fourth global local IP address, if set
5. The IP address of Ether1
6. The IP address of Ether0
The following services use the main IP address:
• syslog
• traceroute
• telnet
• DNS
• RADIUS authentication and accounting
• ChoiceNet
Configuring an Ethernet Interface
Configuring Standalone Ethernet Boards
4-9