Arp Table; Fundamentals Of Authorized Arp - 3Com 3C13636 Configuration Manual

3Com Router 3000 Ethernet Family
Configuration Guide
Operator: Indicates whether the ARP packet is an ARP request or an ARP
response. It can be 1 (for ARP request), 2 (for ARP response), 3 (for RARP
request), or 4 (for RARP response).
Hardware address of the sender: Hardware address of the sending device.
IP address of the sender: IP address of the sending device.
Hardware address of the receiver: Hardware address of the receiving device. In an
ARP request, this field is null. In an ARP response, this field carries the hardware
address of the receiver.
IP address of the receiver: IP address of the receiving device.

2.5.4 ARP Table

Entry 1
Entry 2
Entry 3
Entry 4
Entry 5
...
Entry n
Figure 2-3 ARP table
IF index: Physical interface or port on the device owning the physical address and
IP address.
Physical address: Physical address of the device, that is, the MAC address.
IP address: IP address of the device.
Type: Type of the entry, which can be 2 for an invalid entry, 3 for a dynamically
learned entry, 4 for a statically configured entry, or 1 for an entry falling out of the
previous three cases.

2.5.5 Fundamentals of Authorized ARP

The authorized ARP mechanism is a combination of the ARP mechanism and the
DHCP mechanism. Currently, authorized ARP does not support DHCP relay. The
following explains the operation of authorized ARP in a scenario with the DHCP clients
and DHCP servers on the same segment:
IF index Physical address
3Com Corporation
IP address Type
2-10
Chapter 2 ARP Configuration