MES-3528 User’s Guide
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H A P T E R
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ARP Table
This chapter introduces ARP Table.
38.1 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. In an Ethernet LAN, MAC addresses are
48 bits long. The ARP Table maintains an association between each MAC address
and its corresponding IP address.
38.1.1 How ARP Works
When an incoming packet destined for a host device on a local area network
arrives at the Switch, the Switch'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 Switch 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 Switch 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 MES-3528 -
Page 2: ......
Page 8: ...Safety Warnings MES 3528 User s Guide 8 ...
Page 22: ...22 ...
Page 32: ...Chapter 2 Hardware Installation and Connection MES 3528 User s Guide 32 ...
Page 42: ...Chapter 3 Hardware Overview MES 3528 User s Guide 42 ...
Page 44: ...44 ...
Page 60: ...Chapter 5 Initial Setup Example MES 3528 User s Guide 60 ...
Page 76: ...Chapter 7 System Status and Port Statistics MES 3528 User s Guide 76 ...
Page 88: ...Chapter 8 Basic Setting MES 3528 User s Guide 88 ...
Page 90: ...90 ...
Page 109: ...Chapter 9 VLAN MES 3528 User s Guide 109 Figure 57 Port Based VLAN Setup Port Isolation ...
Page 114: ...Chapter 10 Static MAC Forward Setup MES 3528 User s Guide 114 ...
Page 146: ...Chapter 14 Bandwidth Control MES 3528 User s Guide 146 ...
Page 160: ...Chapter 17 Link Aggregation MES 3528 User s Guide 160 ...
Page 168: ...Chapter 19 Port Security MES 3528 User s Guide 168 ...
Page 180: ...Chapter 21 Policy Rule MES 3528 User s Guide 180 ...
Page 192: ...Chapter 23 VLAN Stacking MES 3528 User s Guide 192 ...
Page 231: ...Chapter 26 IP Source Guard MES 3528 User s Guide 231 Figure 120 DHCP Snooping ...
Page 248: ...Chapter 26 IP Source Guard MES 3528 User s Guide 248 ...
Page 257: ...257 PART IV IP Application Static Route 259 Differentiated Services 263 DHCP 267 ...
Page 258: ...258 ...
Page 262: ...Chapter 29 Static Route MES 3528 User s Guide 262 ...
Page 274: ...Chapter 31 DHCP MES 3528 User s Guide 274 ...
Page 276: ...276 ...
Page 284: ...Chapter 32 Maintenance MES 3528 User s Guide 284 ...
Page 306: ...Chapter 33 Access Control MES 3528 User s Guide 306 ...
Page 312: ...Chapter 35 Syslog MES 3528 User s Guide 312 ...
Page 320: ...Chapter 36 Cluster Management MES 3528 User s Guide 320 ...
Page 324: ...Chapter 37 MAC Table MES 3528 User s Guide 324 ...
Page 330: ...330 ...
Page 342: ...Chapter 41 Product Specifications MES 3528 User s Guide 342 ...
Page 344: ...344 ...
Page 346: ...Appendix A Changing a Fuse MES 3528 User s Guide 346 ...
Page 354: ...Appendix C Legal Information MES 3528 User s Guide 354 ...
Page 364: ...Index MES 3528 User s Guide 364 ...