Netgear XCM8806 Chassis User Manual - Page 619
Proxy ARP, ARP-Incapable Devices
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NETGEAR 8800 User Manual configure Personnel ipaddress 192.207.36.1 configure rip add vlan Finance configure rip add vlan Personnel enable ipforwarding enable rip Proxy ARP Proxy Address Resolution Protocol (ARP) was first invented so that ARP-capable devices could respond to ARP request packets on behalf of ARP-incapable devices. Proxy ARP can also be used to achieve router redundancy and to simplify IP client configuration. The switch supports proxy ARP for this type of network configuration. The section describes some examples of using proxy ARP with the switch. ARP-Incapable Devices To configure the switch to respond to ARP requests on behalf of devices that are incapable of doing so, you must configure the IP address and MAC address of the ARP-incapable device using the following command: configure iparp add proxy [ | {}] {vr } { | vrrp} {always} After it is configured, the system responds to ARP requests on behalf of the device as long as the following conditions are satisfied: • The valid IP ARP request is received on a router interface. • The target IP address matches the IP address configured in the proxy ARP table. • The proxy ARP table entry indicates that the system should answer this ARP request, based on the ingress VLAN and whether the always parameter is set. When the always option is set, the switch always responds to the ARP request even when the ARP requester is on the same subnet as the requested host. If the always option is not set, the switch only answers if the ARP request comes in from a VLAN that is not on the same subnet as the requested host. When all the proxy ARP conditions are met, the switch formulates an ARP response using one of the following MAC addresses: • A specific MAC address specified with the option • The VRRP virtual MAC address when the vrrp option is specified and the request is received on a VLAN that is running VRRP. • The switch MAC address when neither of the above options applies. Chapter 20. IPv4 Unicast Routing | 619
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