Chapter 17
| General IP Routing
Address Resolution Protocol
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requesting node. That node then sends traffic to the router, which in turn uses its
own routing table to forward the traffic to the remote destination.
Figure 443: Proxy ARP
Parameters
These parameters are displayed:
◆ Timeout – Sets the aging time for dynamic entries in the ARP cache.
(Range: 300 - 86400 seconds; Default: 1200 seconds or 20 minutes)
The ARP aging timeout can be set for any configured VLAN.
The aging time determines how long dynamic entries remain in the cache. If
the timeout is too short, the router may tie up resources by repeating ARP
requests for addresses recently flushed from the table.
When a ARP entry expires, it is deleted from the cache and an ARP request
packet is sent to re-establish the MAC address.
◆ Proxy ARP – Enables or disables Proxy ARP for specified VLAN interfaces,
allowing a non-routing device to determine the MAC address of a host on
another subnet or network. (Default: Disabled)
End stations that require Proxy ARP must view the entire network as a single
network. These nodes must therefore use a smaller subnet mask than that used
by the router or other relevant network devices.
Extensive use of Proxy ARP can degrade router performance because it may
lead to increased ARP traffic and increased search time for larger ARP address
tables.
Web Interface
To configure the timeout for the ARP cache or to enable Proxy ARP for a VLAN (i.e.,
IP subnetwork):
1. Click IP, ARP.
2. Select Configure General from the Step List.
3. Set the timeout to a suitable value for the ARP cache, or enable Proxy ARP for
subnetworks that do not have routing or a default gateway.
4. Click Apply.
no routing,
no default
gateway
Remote
ARP Server
Proxy ARP
ARP
request
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