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EX3510-B1 User’s Guide
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C
HAPTER
23
ARP Table
23.1 ARP Table Overview
Address Resolution Protocol (ARP) is a protocol for mapping an Internet Protocol address (IP address) to
a physical machine address, also known as a Media Access Control or MAC address, on the local area
network.
An IP (version 4) address is 32 bits long. MAC addresses are 48 bits long. The ARP Table maintains an
association between each MAC address and its corresponding IP address.
23.1.1 How ARP Works
When an incoming packet destined for a host device on a local area network arrives at the device, the
device's ARP program looks in the ARP Table and, if it finds the address, sends it to the device.
If no entry is found for the IP address, ARP broadcasts the request to all the devices on the LAN. The
device fills in its own MAC and IP address in the sender address fields, and puts the known IP address of
the target in the target IP address field. In addition, the device puts all ones in the target MAC field
(FF.FF.FF.FF.FF.FF is the Ethernet broadcast address). The replying device (which is either the IP address of
the device being sought or the router that knows the way) replaces the broadcast address with the
target's MAC address, swaps the sender and target pairs, and unicasts the answer directly back to the
requesting machine. ARP updates the ARP Table for future reference and then sends the packet to the
MAC address that replied.
Summary of Contents for EX3510-B1
Page 15: ...15 PART I User s Guide...
Page 38: ...Chapter 3 Quick Start Wizard EX3510 B1 User s Guide 38 Figure 23 Wizard WiFi...
Page 55: ...Chapter 4 Tutorials EX3510 B1 User s Guide 55 Tutorial Advanced QoS Class Setup...
Page 60: ...60 PART II Technical Reference...
Page 90: ...Chapter 7 Wireless EX3510 B1 User s Guide 90 Figure 51 Network Setting Wireless General...
Page 253: ...Chapter 31 Time Settings EX3510 B1 User s Guide 253 Figure 164 Maintenance Time...
Page 265: ...Chapter 34 Firmware Upgrade EX3510 B1 User s Guide 265 Network Temporarily Disconnected...