Cisco Ethernet switch Manuale Utente Pagina 33

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© 2002, Cisco Systems, Inc. All rights reserved.
l2-security-bh.ppt
Gratuitous ARP
¥ Gratuitous ARP is used by hosts to ÒannounceÓ their
IP address to the local network and avoid duplicate
IP addresses on the network; routers and other
network hardware may use cache information gained
from gratuitous ARPs
¥ Gratuitous ARP is a broadcast packet (like an ARP
request)
¥ HOST W: Hey everyone IÕm host W and my IP
Address is 1.2.3.4 and my MAC address is
12:34:56:78:9A:BC
V X ZW Y
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