User`s guide

Configuring IP Broadcast Settings
7-14 Configuring IP
Disabling or Re-enabling Proxy ARP on an Interface
AvariationoftheARPprotocol,proxyARPallowstheroutingmoduletosendanARPresponse
onbehalfofanendnodetotherequestinghost.ProxyARPcanlessenbandwidthuseonslow‐
speedWANlinks.Itisenabledbydefault.
Frominterfaceconfigurationmode,usethiscommandto
disableproxyARPonaninterface:
no ip proxy-arp
Usethisformofthecommandtore‐enableproxyARP:
ip proxy-arp
Assigning a MAC Address to an Interface
Bydefault,everyroutinginterfaceusesthesameMACaddress. Whennecessary,youcanassign
differentMACaddresstodifferentinterfaces,aslongasyouarecarefultoselectaMACaddress
thatwillnotconflictwithotherdevicesontheVLAN.
Frominterfaceconfigurationmode,usethiscommandtoassign
aMACaddressonaninterface.
ip mac-address address
Usethe“no”formofthiscommandtoremoveaMACaddressfromaninterface:
no ip mac-address address
Changing the ARP Timeout
TheMatrixDFESeriesorN‐SAdevicecansupportupto2000outstandingunresolvedARP
entries.Bydefault,theseentrieswillstayintheARPtablefor14,400secondsbeforeexpiring.
Fromglobalconfigurationmode,usethiscommandtochangetheARPti meoutvalue:
arp timeout seconds
Validvaluesare0‐65535seconds.Avalueof0specifiesthatARPentrieswillneverbeaged
out.
Clearing the ARP Cache
FromprivilegedEXECmode,usethiscommandtodeleteallnonstatic(dynamic)entriesfromthe
ARPtable:
clear arp-cache
Configuring IP Broadcast Settings
UsetheproceduresinthissectiontoperformthefollowingIPbroadcastconfigurationtasks:
• EnablingorDisablingIPDirectedBroadcasts
• ConfiguringUDPBroadcastForwarding
Note: It is important to select a MAC address that will not conflict with other devices on the VLAN
since the Matrix Series device will not automatically detect this conflict.