4.9 Summary

4.9 Summary

ARP is a basic protocol in almost every TCP/IP implementation, but it normally does its work without the application or the system administrator being aware. The ARP cache is fundamental to its operation, and we've used the arp command to examine and manipulate the cache. Each entry in the cache has a timer that is used to remove both incomplete and completed entries. The arp command displays and modifies entries in the ARP cache.

We followed through the normal operation of ARP along with specialized versions: proxy ARP (when a router answers ARP requests for hosts accessible on another of the router's interfaces) and gratuitous ARP (sending an ARP request for your own IP address, normally when bootstrapping).



TCP.IP Illustrated, Volume 1. The Protocols
TCP/IP Illustrated, Vol. 1: The Protocols (Addison-Wesley Professional Computing Series)
ISBN: 0201633469
EAN: 2147483647
Year: 1993
Pages: 378

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