Netgear GS728TXS GS728TXS/GS752TXS Software Administration Manual - Page 166

GS752TXS and GS728TXS Smart Switches Configure ARP The address resolution protocol (ARP) associates a layer 2 MAC address with a layer 3 IPv4 address. GS752TXS and GS728TXS Smart Switches software features both dynamic and manual ARP configuration. With manual ARP configuration, you can statically add entries into the ARP table. ARP is a necessary part of the Internet protocol (IP) and is used to translate an IP address to a media (MAC) address, defined by a local area network (LAN) such as Ethernet. A station needing to send an IP packet must learn the MAC address of the IP destination, or of the next hop router, if the destination is not on the same subnet. This is achieved by broadcasting an ARP request packet, to which the intended recipient responds by unicasting an ARP reply containing its MAC address. Once learned, the MAC address is used in the destination address field of the layer 2 header prepended to the IP packet. The ARP cache is a table maintained locally in each station on a network. ARP cache entries are learned by examining the source information in the ARP packet payload fields, regardless of whether it is an ARP request or response. Thus, when an ARP request is broadcast to all stations on a LAN segment or virtual LAN (VLAN), every recipient has the opportunity to store the sender's IP and MAC address in their respective ARP cache. The ARP response, being unicast, is normally seen only by the requestor, who stores the sender information in its ARP cache. Newer information always replaces existing content in the ARP cache. The GS752TXS/GS728TXS switches support 1024 ARP entries, which includes dynamic and static ARP entries. Devices can be moved in a network, which means the IP address that was at one time associated with a certain MAC address is now found using a different MAC, or can have disappeared from the network altogether (i.e., it has been reconfigured, disconnected, or powered off). This leads to stale information in the ARP cache unless entries are updated in reaction to new information seen on the network, periodically refreshed to determine if an address still exists, or removed from the cache if the entry has not been identified as a sender of an ARP packet during the course of an ageout interval, usually specified via configuration. To configure and display ARP details, see the following sections: • ARP Cache • Create a Static ARP Entry • Configure Global ARP Settings • Remove an ARP Entry From the ARP Cache ARP Cache Use the ARP Cache screen to view entries in the ARP table, a table of the remote connections most recently seen by this switch.  To display entries in the ARP table: Select Routing  ARP > Basic  ARP Cache. The ARP Cache screen displays. 166