3Com 3C13636 Configuration Manual page 303

3Com Router 3000 Ethernet Family
Configuration Guide
By default, the interface does not assign IP address to the remote end.
Note:
When both the remote address pool [ pool-number ] command and the remote
address ip-address command are configured, the system uses the address specified
by the latter for assignment.
To sum up, the system assigns an IP address to a PPP user following these rules:
1) For a domain user (userid or userid@isp-name)
Address assignment depends on its authentication type, as shown in the following
table.
Table 1-12 Assign an address to a domain user
Authentication/
Authorization type
RADIUS/TACACS
Local
2) For a non-authenticated user
The router assigns the address specified directly on the interface or an address
picked from the global address pool assigned to the interface.
The PPP user, however, does not necessarily accept the assigned address. Instead, it
may choose to use a self-configured IP address.
To force the PPP user to accept the assigned address, perform the following
command in interface view at the server end.
Table 1-13 Enable/disable forced IP address assignment with PPP IPCP negotiation
Forbid the peer to use a self-configured
fix IP address in PPP IPCP negotiation.
Disable forced address assignment in
PPP IPCP negotiation.
1) If the RADIUS or TACACS server issues an address,
the router assigns this address to the domain user.
2) If the RADIUS or TACACS server issues a domain
address pool instead of an address, the router picks
an address from the pool.
3) If neither address nor domain address pool is issued,
the router looks up the address pools of the domain in
turn for an address.
The router looks up the address pools of the domain in
turn and picks an address.
Operation
3Com Corporation
1-11
Chapter 1 PPP and MP Configuration
Address assignment
Command
ppp ipcp remote-address forced
undo ppp ipcp
forced
remote-address