Extreme Networks Altitude 4000 Series, Справочное руководство, Страница: 182 / 521

Chapter 6: Device Configuration
Altitude
TM
4000 Series Access Point System Reference Guide
182
Overriding an ARP Configuration
“Overriding the Network Configuration”
Address Resolution Protocol (ARP) is a protocol for mapping an IP address to a hardware MAC
address. ARP provides protocol rules for making this correlation and providing address conversion in
both directions. This ARP assignment can be overridden as needed, but removes the device
configuration from the managed profile that may be shared with other similar device models.
When an incoming packet destined for a host arrives at the access point, the access point’s gateway uses
ARP to find a physical host or MAC address that matches the IP address. ARP looks in its ARP cache
and, if it finds the address, provides it so the packet can be converted to the right packet length and
format and sent to the destination. If no entry is found for the IP address, ARP broadcasts a request
packet in a special format to all the machines on the LAN to see if one machine knows it has that IP
address associated with it. A machine that recognizes the IP address as its own returns a reply
indicating as such. ARP updates the ARP cache for future reference and then sends the packet to the
MAC address that replied.
To define an ARP supported configuration:
1 Select Devices from the Configuration tab.
2 Select a target device from the Device Browser in the lower, left-hand, side of the UI
3 Select Profile Overrides from the Device menu to expand it into sub menu options.
4 Select Network to expand its sub menu options.
5 Select ARP .
NOTE
A blue override icon (to the left of a parameter) defines the parameter as having an override applied. To
remove an override, go to the Basic Configuration screen’s Device Overrides field and select Clear Overrides.
This will remove all overrides from the device.