R2511-HP MSR Router Series Terminal Access Configuration Guide(V5)

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Figure 2 Terminal access network
Source address binding
The principle of source IP address binding is to configure an IP address on a stable interface (the
loopback interface or dialer interface is recommended) and use this address as the source IP address of
the upstream TCP connection from the router through IP unnumbered configuration.
If an FEP runs, the IP address of the router connected to the FEP needs to be authenticated. Therefore,
when the dial-up backup function is used in a wide area network (WAN), if the primary link fails, the
router begins to use the backup interface. In that case, the IP address of the router is changed, and the
authentication fails if source IP address binding is not implemented. To avoid such failures, configure
source IP address binding on the router to use a fixed IP address to establish a TCP connection with the
FEP.
For security or some other reason, you may need to hide the actual IP address used in the upstream TCP
connection on the router, and use another IP address. In that case, you must also configure source IP
address binding.
Make sure the FEP and the router’s IP address are reachable to each other.
Terminal menu
The terminal menu allows you to bring up the menu interface by pressing the menu hotkey at the terminal.
The menu interface displays the services provided by each VTY on the terminal. By entering a service
option, you can switch to the corresponding service display. The menu interface displays:
TTY ACCESS SYSTEM
VERSION 3.0
1. SELECT VTY(0): chuxu
2. SELECT VTY(1): duigong
0. QUIT