Q: Which interface address at MA5200G can send L2TP and RADIUS packets?
1. For sending RADIUS packets
a. When MA5200G sends RADIUS packets, the system will give priority to IP address bound with interface at radius-server as source address to send RADIUS packets, as follows:
[MA5200G]radius-server source interface ?
Atm Atm interface
Eth-Trunk Ethernet Trunk interface
Ethernet ethernet port
Ip-Trunk IP Trunk interface
LoopBack LoopBack interface
b. If the system configuration is not bound with the interface, and the system will use IP address of local route table reaching RADIUS server interface to send RADIUS packets, generally upstream address at MA5200G.
2. For sending L2TP packets
a. If RADIUS floods Tunnel_Client_Endpoint attributes (No. 66 atribute), MA5200G will use the address as the source to send L2TP packets to LNS.
b. If RADIUS do not flood, MA5200G will choose bound loopback address as source address to send L2TP to LNS, as follows:
[MA5200G-l2tp-1]tunnel source LoopBack ?
<0-2,13-14> LoopBack interface index
c. If the topology is not bound with loopback address, the system will use IP address o f local route address reaching LNS interface to send L2TP packets to LNS, generally upstream address at MA5200G.