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ZyXEL Communications 794M 2.6 ARP Table, 2.6.1 How ARP Works, Status, ARP Table

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Prestige 794M User’s Guide

Table 3 Status	(continued)

LABEL		DESCRIPTION

RFC1483 WAN		This field displays the VCI and VPI number and the number of packets received/
Link		transmitted. Click this label to display detailed information.
Ethernet		This field displays the number of packets received/transmitted. Click this label to
		display detailed information.
SAVE CONFIG		Click SAVE CONFIG to save the changes.

RESTART		Click RESTART to reboot the device. All unsaved changes will be lost.

LOGOUT		Click LOGOUT to exit from the web configurator. All unsaved changes will be lost.

2.6 ARP Table

Address Resolution Protocol (ARP) is a protocol for mapping an Internet Protocol address (IP address) to a physical machine address, also known as a Media Access Control (MAC) address, on the local area network. An IP (version 4) address is 32 bits long. In an Ethernet LAN, MAC addresses are 48 bits long. The ARP table maintains an association between each MAC address and its corresponding IP address.

2.6.1 How ARP Works

When an incoming packet destined for a host device on a local area network arrives at the device, the device's ARP program looks in the ARP table and, if it finds the address, sends it to the device. If no entry is found for the IP address, ARP broadcasts the request to all the devices on the LAN. The device fills in its own MAC and IP address in the sender address fields, and puts the known IP address of the target in the target IP address field. In addition, the device puts all ones in the target MAC field (FF.FF.FF.FF.FF.FF is the Ethernet broadcast address). The replying device (which is either the IP address of the device being sought or the router that knows the way) replaces the broadcast address with the target's MAC address, swaps the sender and target pairs, and unicasts the answer directly back to the requesting machine. ARP updates the ARP table for future reference and then sends the packet to the MAC address that replied.

To view the ARP table, click Status and ARP Table in the navigation panel.

Figure 9 Status: ARP Table

29	Chapter 2 The Web Configurator

Contents

User’s Guide Copyright Disclaimer Trademarks Federal Communications Commission (FCC) Interference Statement Notice Certifications Safety Warnings ZyXEL Limited Warranty Note Safety Warnings Customer Support Page Table of Contents Page Page QoS (Quality of Service) Static Route Page Page List of Figures Page List of Tables Page Preface About This User's Guide Related Documentation User Guide Feedback Syntax Conventions Graphics Icons Key Introduction 1.1 About Your Prestige 1.2 Features Multi-ModeStandard 10/100M Auto-negotiatingEthernet/Fast Ethernet Interface(s) Multiplexing Full Network Management Universal Plug and Play (UPnP) Network Address Translation (NAT) Firewall 1.3 Applications 1.3.1 Internet Access 1.3.2 Firewall for Secure Broadband Internet Access 1.3.3 VPN Application 1.3.4 LAN-to-LANApplication 1.4 Hardware Connection 1.4.1 Front Panel 1.5 Rear Panel The Web Configurator 2.1 Overview 2.2Accessing the Web Configurator 2.3 Resetting the Prestige 2.3.1 Procedure To Use The Reset Button 2.4Navigating the Web Configurator 2.4.1 The Status Screen 2.5System Status 2.6 ARP Table 2.6.1 How ARP Works 2.7 Routing Table 2.7.1 PPTP Status 2.7.2 IPSec Status 2.7.3 L2TP Status 2.7.4 Email Status 2.7.5 Event Log 2.7.6 Error Log 2.7.7 NAT Sessions 2.8 Internet Access Quick Start Setup Page 2.8.1 Auto Scan LAN 3.1 Overview 3.2 LAN TCP/IP 3.2.1 Factory LAN Defaults 3.2.2 IP Address and Subnet Mask 3.3The Ethernet Screen 3.4 Ethernet Client Filter 3.4.1 Ethernet Client Filter Candidates 3.5 Port Setting 3.6 DHCP 3.6.1 IP Pool Setup 3.6.2 DNS Servers 3.6.3DHCP Setup 3.6.3.1 Disable DHCP 3.6.3.2 DHCP Server Setup Page 3.6.4 DHCP Relay Agent DHCP Relay WAN 4.1 Overview 4.1.1 Encapsulation Types 4.1.1.1 RFC 4.1.1.2 PPPoE 4.2 ISP 4.2.1 Edit Settings 4.2.1.1 Advanced PPP Options Page 4.2.2 Change Connection Type 4.3DNS 4.4 SHDSL Parameters Table 25 SHDSL Page System 5.1 Overview 5.2 Time Zone 5.3 Remote Access 5.4 Firmware Upgrade 5.5Backup/Restore 5.6 Restart Router 5.7 User Management 5.7.1 Create a New User Account Page Firewall 6.1 Overview 6.2 Types of Firewalls 6.2.1Packet Filtering Firewalls 6.2.2 Application-levelFirewalls 6.2.3Stateful Inspection Firewalls 6.3 General Settings 6.4 Packet Filter Policy Firewall: General Settings 6.4.1 Add a New TCP/UDP Packet Filter 6.4.2 Add a New Raw Packet Filter 6.5 Intrusion Detection Intrusion Detection 6.6 URL Filter 6.6.1 Keywords Filtering 6.6.2 Domain Filtering 6.7 Firewall Log Page VPN 7.1 Overview 7.2 PPTP 7.2.1 PPTP Summary 7.2.2 Creating a PPTP VPN Rule 7.2.2.1 Remote Access Connection Page 7.2.2.2 LAN to LAN Connection Page 7.3 IPSec 7.3.1 AH (Authentication Header) 7.3.2 ESP (Encapsulating Security Payload) 7.3.3 Perfect Forward Secrecy (PFS) 7.3.4 Pre-SharedKey 7.3.5 IPSec VPN Summary 7.3.6 IPSec VPN Configuration Page 7.4 L2TP 7.4.1 Creating a New L2TP Rule 7.4.1.1 Remote Access L2TP Connection Page 7.4.1.2 LAN to LAN L2TP Connection Page Page 7.5 VPN Example 7.5.1 Example: Remote PPTP VPN Dial-inConnection 7.5.2 Example: Remote PPTP VPN Dial-outConnection MUST QoS (Quality of Service) 8.1 Overview 8.1.1 Prioritization Page 8.2 IP Throttling Page 8.3 QoS Example 8.3.1 Example Prioritization with QoS 8.3.2 Rate Limiting with IP Throttling Example 8.4 Time Schedule 8.4.1 Configuring a Time Schedule Page Static Route 9.1 Overview 9.2 Configuration Page Dynamic DNS 10.1 Overview 10.1.1 Configuration Page Check Emails 11.1 Overview 11.2 Configuring Page Device Management 12.1 Overview 12.1.1 Universal Plug and Play (UPnP) 12.1.1.1 How do I know if I'm using UPnP 12.1.1.2 Cautions with UPnP 12.1.2.1SNMPv3 12.1.2.2 SNMP Traps and MIBs 12.2 The Device Management Screen WAN Page 12.3 IGMP Numerics Index