BSR 2000 Configuration and Management Guide
Release 1.0
5-12
MGBI
526360-001-00 Rev. B
Address Resolution Using Proxy ARP
The router uses proxy ARP, as defined in RFC 1027, to help hosts with no knowledge
of routing determine the hardware addresses of hosts on the same or other networks or
subnets. Under proxy ARP, if the router receives an ARP request for a host that is not
on the same network as the ARP request sender, and if the router has the best route to
that host, the router sends an ARP reply packet giving its own local data link address.
In addition, if a host on the local network is incapable of responding to an ARP
request, the router responds on its behalf when Proxy ARP is enabled and host
IP-to-MAC address mapping is stored in the router with a static
arp
command
invoked with the
alias
option. The host that sent the ARP request then sends its
packets to the router, which forwards them to the intended host.
1.
Proxy ARP is not enabled by default. Use the
ip proxy-arp
command in Interface
Configuration mode to enable Proxy ARP:
MOT
(config-if)#
ip proxy-arp
2.
Use the
no ip proxy-arp
command in Interface Configuration mode to disable
Proxy ARP:
MOT
(config-if)#
no ip proxy-arp
3.
Use the
show running-config
command in Privileged EXEC mode to verify
ARP status:
MOT
#
show running-config
Configuring Broadcast Addressing
A broadcast is a data packet destined for all hosts on a particular physical network.
Network hosts recognize broadcasts by special addresses. The BSR system supports
the following broadcast packet types:
■
Limited Broadcast - A packet is sent to a specific network or series of networks.
■
Flooded Broadcast - A packet is sent to every network.
Use a single broadcast address scheme on a network and set the address to be used as
the broadcast address to avoid broadcast storms. The BSR can accept and interpret all
possible forms of broadcast addresses.
Use the
ip broadcast-address
command in Interface Configuration mode to specify a
broadcast IP address for an interface:
MOT
config-if)
#
ip broadcast-address
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