Dasan V8102, Руководство пользователя

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User Manual
UMN:CLI
V8102
277
8.1.5 Gratuitous ARP
Gratuitous ARP is a broadcast packet like an ARP request. It containing IP address and
MAC address of gateway, and the network is accessible even though IP addresses of
specific host
’s gateway are repeatedly assigned to the other.
Configure Gratuitous ARP interval and transmission count using following commands.
And configure transmission delivery-start in order to transmit Gratuitous ARP after ARP
reply. Gratuitous ARP is transmitted after some time from transmitting ARP reply.
Command Mode Description
arp patrol TIME COUNT [ TIME ]
Global
Configures a gratuitous ARP.
TIME: transmit interval
COUNT: transmit count
no arp patrol Disables a gratuitous ARP.
8.1.6 Proxy ARP
The V8102 supports the proxy ARP. Proxy ARP is the technique in which one host, usual-
ly a router, answers ARP requests intended for another machine. By
“faking” its identity,
the router accepts responsibility for routing packets to the
“real” destination. Proxy ARP
can help the switches on a subnet reach remote subnets without configuring routing or a
default gateway.
The host A has a /16 subnet mask. What this means is that the host A believes that it is
directly connected to all of network 172.16.0.0. When the host A needs to communicate
with any switches if believes are directly connected, it will send an ARP request to the
destination. Therefore, when the host A needs to send a packet to the host D, the host A
believes that the host D is directly connected, so it sends an ARP request to the host D.
Fig. 8.1 Proxy ARP