Configuring Enhanced Proxy ARP

Use the Enhanced Proxy ARP window for help on how to enable enhanced proxy ARP, how to add or modify enhanced proxy ARP subnets, and how to modify subnet interfaces.

In indirect proxy is when a router that has ARP routing enabled and proxy-on-behalf enabled, can optionally issue ARP responses on behalf of routers that are not running proxy ARP. When an ARP request is received and the output interface is the same as the input interface and the next hop is a router, then the receiving router issues an ARP response with the next hop router’s MAC address in the sender hardware address field instead of its own address.

To communicate directly over a LAN environment using enhanced proxy ARP, you must configure hosts to ARP for all destination addresses. For information on how to configure common operating systems for ARP routing, click here.

Enabling Enhanced Proxy ARP

Enabling enhanced proxy ARP globally enables enhanced proxy ARP on all LAN interfaces running IP that have not been disabled with the modify interfaces procedure.

Procedure:

Step Action
1 From the Enhanced Proxy ARP drop-down box, select Enabled.
2 Click Apply.  Enhanced proxy ARP is enabled.

 

Adding Enhanced Proxy ARP Subnets

Use this procedure to prevent enhanced proxy ARP routing for destinations in certain subnets. 

Procedure:

Step Action
1 In the Subnets table, click Add.  The Enhanced Proxy ARP Add/Modify Subnet window appears with zeros in all fields.
2 Enter an interface number in the Interface Number field.
3 Enter a subnet address in the Subnet Address field.
4 Enter a subnet mask in the Subnet Mask field.
5 Click Apply.  The subnet is added to the router's configuration.

 

Modifying Enhanced Proxy ARP Subnets

Procedure:

Step Action
1 In the Subnets table, click the Mod button associated with the subnet you want to modify.  The Enhanced Proxy ARP Add/Modify Subnet window appears displaying the subnet you selected.
2 Enter a new interface number, if appropriate, in the Interface Number field.
3 Enter a new subnet address, if appropriate, in the Subnet Address field.
4 Enter a new subnet mask, if appropriate, in the Subnet Mask field.
5 Click Apply.  The subnet is modified in the router's configuration.

 

Deleting Enhanced Proxy ARP Subnets

Procedure:

Step Action
1 In the Subnets table, click the Del button associated with the subnet you want to delete.  The subnet is deleted from the router's configuration.
2 Enter 0.0.0.0 in the Subnet Address field.
3 Click Apply.  The subnet is deleted from the router's configuration.

 

Modifying Enhanced Proxy ARP Interfaces

This procedure allows you to modify enhanced proxy ARP and proxy on behalf for each interface.  When enhanced proxy ARP is initially enabled, enhanced proxy ARP for each interface is set to On and  proxy on behalf is set to No.

Procedure:

Step Action
1 In the Interfaces table, click the Mod button associated with the interface you want to modify.  The Enhanced Proxy ARP Modify Interface window appears.
2 In the Routing on Interface box, if appropriate, select On or Off to change the state of enhanced proxy ARP.
3 In the Proxy on Behalf box, if appropriate, select No or Yes to change the state of proxy on behalf.
4 Click Apply.

 

 Field Descriptions

Subnets
Interface Number Network number assigned to the interface.
Subnet Address Subnet address of the interface.
Subnet Mask Subnet mask of the interface.
Interfaces
Interface Number Network number assigned to the interface.
Enhanced Proxy ARP Enhanced proxy ARP for an interface is enabled or disabled.
Proxy On Behalf An indirect proxy that indicates whether an interface is enabled or disabled.