HD Link Installation & Operation Manual
5 – Web Browser Interface Configuration & Operation
Version 2, April 2010
5-32
Harris Corporation
Intraplex Products
Figure 5-25. Network | ARP/Proxy ARP Page
ARP Table
The ARP table contains mappings between a destination’s IP address and its corresponding Ethernet or
MAC address that are learned using ARP. Each entry represents one destination with whom the system
has recently communicated. To keep the table from growing without bound, the system periodically
removes or “ages” a mapping from the table. An ARP entry contains
●
IP Address
: IP address of the destination.
●
MAC Address
: MAC address of the destination.
●
Type
: Whether the mapping is
dynamic
or
static
. Static ARP entries are never removed because
of their age.
●
Source Interface
: Ethernet interface over which the destination is reachable:
HD
or
LAN
.
●
Flush the ARP Table
: Click
to manually clear all entries from the ARP table regardless of age
or type.
Proxy ARP Table
Because the RF link from the transmitter to the receiver is inherently one way, the transmitter blocks
all Layer 2 broadcast packets it receives on its IP interfaces from going over the radio link, including
ARP packets. To satisfy the needs of network stations trying to determine Ethernet addresses for
station on the other side of the RF link, the transmitter responds to ARP requests with its own MAC
address for any IP address added to the
Proxy ARP
table.
When a land-based return path is present from the receiver back to the transmitter, the receiver also
blocks Layer 2 broadcast packets from going on the return path in case the return path has limited
bandwidth. Like the transmitter, the receiver can be configured to respond to ARP requests with its
own MAC address for any IP address added to the
Proxy ARP
table.