Allied Telesis AR2050V, Справочник по командам, Страница: 671 / 2824

C613-50186-01 Rev B Command Reference for AR2050V 671
AlliedWare Plus™ Operating System - Version 5.4.7-1.x
IP A
DDRESSING AND
P
ROTOCOL
C
OMMANDS
IP LIMITED
-
LOCAL
-
PROXY
-
ARP
ip limited-local-proxy-arp
Overview Use this command to enable local proxy ARP, but only for a specified set of IP
addresses. This makes the device respond to ARP requests for those IP addresses
when the addresses are reachable via the interface you are configuring.
To specify the IP addresses, use the command local-proxy-arp .
Use the no variant of this command to disable limited local proxy ARP. This stops
your device from intercepting and responding to ARP requests for the specified
hosts. This allows the hosts to use MAC address resolution to communicate directly
with one another.
Syntax ip limited-local-proxy-arp
no ip limited-local-proxy-arp
Default Limited local proxy ARP is disabled by default.
Mode Interface Configuration
Usage Limited local proxy ARP supports Static NAT configurations in which the NAT
configuration’s public address is different to the ethernet interface’s address.
On such ethernet interfaces, the device needs to respond to ARP requests for the
public address so that it will receive packets targeted at that address.
Limited local proxy ARP makes this possible. It is especially useful when you have
a number of 1-1 NAT configurations and each public address falls within the public
interface’s subnet. If you enable limited local proxy ARP on the public interface and
specify suitable addresses, the device will respond to ARP requests for those
addresses, as long as the addresses are routed out the interface the ARP requests
are received on. The device responds with its own MAC address.
Example The following configuration snippet shows how to use limited local proxy ARP, if
you are using NAT for an HTTP server with an address of 172.22.0.3 connected via
eth1, and eth1 has an address of 172.22.0.1: