
Customizing ARP and RARP Services
308627-14.20 Rev 00
4-3
Customizing Global ARP
You can use the BCC or Site Manager to customize global ARP as follows:
• Control whether IP drops and logs an invalid ARP source address or simply
drops the request.
• Control whether IP drops or accepts ARP requests in which the source and
destination addresses are located in different networks or subnetworks. This
parameter allows Proxy ARP to generate replies when the source and
destination networks in the ARP request differ.
• Control how ARP acts in relation to IP’s forwarding state (Site Manager
only).
Logging Nonlocal ARP Source Addresses
A source ARP address is “invalid” when it is in a different IP network from the
target IP interface. You can specify the response to an invalid ARP source address
as follows:
• Log the invalid ARP source address: IP logs and drops an invalid ARP source
address when processing an ARP request.
• Drop the invalid ARP source address: IP does not log the address.
In either case, IP drops the invalid ARP request.
Setting the Nonlocal ARP Destination Response
By default, IP drops ARP requests in which the source and destination addresses
are located in different networks or subnetworks. You can enable the router to
allow Proxy ARP to generate replies when the source and destination networks in
the ARP request are different.
Note:
You must enable Proxy ARP for the router to generate ARP replies (see
“
Enabling Proxy ARP on an Interface” on page 4-9).
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