Technicolor - Thomson SpeedTouchTM620 manual How to Force the Source IP Address, Mtu

Chapter 10

SpeedTouch™ Monitoring

10.2.6 How to Force the Source IP Address

About Loopback

How to Assign an IP Address to the Local Loop Interface

How to Make the Local Loop Address the Primary Address

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.

Use the following command to assign an IP address to the local loop interface:

=>:ip ipadd intf=loop addr=50.60.70.80 addroute=enabled

Use the folllowing commands to make this IP address the primary IP address of the SpeedTouch™:

=>:ip ifconfig intf=loop primary=enabled

=>:ip ipconfig addr=50.60.70.80 primary=enabled

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 Use the following command to view the loopback configuration: Loopback Configuration

=>:ip iflist expand=enabled					TX	TX-Drop	Status HW-address
Interface	Group	MTU		RX
0 loop	local	65535		31438 33137		0	[UP] 00:0e:50:5a:dd:
0f		: ff:ff:ff:ff:ff:ff
BRHW-address
RX unicastpkts:			335		brcastpkts : 0		droppkts:0
TX unicastpkts:			502		brcastpkts : 0
Oper state		:	UP		Admin State: UP
Flags		:	PRIMARY		LOOP INTERNAL

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