Technicolor - Thomson Wireless Business DSL Routers SpeedTouchTM620 - Manual (Page 156)

Chapter 10
SpeedTouch™ Monitoring
E-DOC-CTC-20051017-0155 v1.0 146
10.2.6 How to Force the Source IP Address
About Loopback The SpeedTouch™ offers the possibility to send SNMP traps to an SNMP manager.
This facilitates the monitoring of the network. It is important that the source IP
address of the SNMP traps remains the same at all times, so the Network Control
Centre knows who is sending the traps.
Making the loopback interface the primary interface of the SpeedTouch™ ensures
that all messages leaving the SpeedTouch™ have the loopback interface’s IP
address as source address. This facilitates monitoring of the device by the Control
Centre. This address remains the same even when the SpeedTouch™ has slipped in
ISDN fallback WAN connectivity.
How to Assign an IP
Address to the Local
Loop Interface
Use the following command to assign an IP address to the local loop interface:
How to Make the Local
Loop Address the
Primary Address
Use the folllowing commands to make this IP address the primary IP address of the
SpeedTouch™:
The first command sets the loopback interface as primary interface of the
SpeedTouch™. The second command sets the IP address as primary address of the
loopback interface (instead of the default 127.0.0.0)
How the View the
Loopback Configuration
Use the following command to view the loopback configuration:
=>:ip ipadd intf=loop addr=50.60.70.80 addroute=enabled
=>:ip ifconfig intf=loop primary=enabled
=>:ip ipconfig addr=50.60.70.80 primary=enabled
=>:ip iflist expand=enabled
Interface Group MTU RX TX TX-Drop Status HW-address
0 loop local 65535 31438 33137 0 [UP] 00:0e:50:5a:dd:
0f
BRHW-address : ff:ff:ff:ff:ff:ff
RX unicastpkts: 335 brcastpkts : 0
TX unicastpkts: 502 brcastpkts : 0 droppkts:0
Oper state : UP Admin State: UP
Flags : PRIMARY LOOP INTERNAL