Chapter 2 Arp Configuration; Dynamic/Static Arp Configuration; Introduction To Dynamic Arp; Brief Introduction To Static Arp - 3Com 3C13636 Configuration Manual

3Com Router 3000 Ethernet Family
Configuration Guide

Chapter 2 ARP Configuration

2.1 Dynamic/Static ARP Configuration

2.1.1 Introduction to Dynamic ARP

ARP (Address Resolution Protocol) is mainly used for resolution from IP address to
Ethernet MAC address. Normally, dynamical ARP is used to resolve the mapping
relation from the IP address to the Ethernet MAC address. The resolution is completed
automatically without interference of the administrator.
In the implementation of V 2.41, the system creates or updates ARP entries when
receiving an ARP message compliant with one of the following conditions:
The source IP address is a non-broadcast address located in the same segment
attached to the receiving interface, the destination IP address is the same as the
IP address of the interface.
The source IP address is a non-broadcast address located in the same segment
attached to the receiving interface, the destination IP address is the VRRP virtual
IP address on the interface.
The destination IP address is included in the NAT address pool on the receiving
interface.
In addition, if one ARP entry has existed for the source IP address, the system updates
the entry.

2.1.2 Brief Introduction to Static ARP

Static ARP applies to:
Bind packets destined to an address beyond this segment to a network adapter, so
that they can be forwarded through this gateway.
Filter out invalid IP addresses by binding them to a MAC address that does not
exist.
2.1.3 Static ARP Configuration
The static ARP configuration includes:
Manually add/delete static ARP mapping table item.
Perform the following task in the system view.
3Com Corporation
2-1
Chapter 2 ARP Configuration