3Com 3C13636 Configuration Manual page 391

3Com Router 3000 Ethernet Family
Configuration Guide
Chapter 1 IP Address Configuration ........................................................................................... 1-1
1.1 IP Address Overview ......................................................................................................... 1-1
1.2 IP Address Configuration................................................................................................... 1-4
1.2.1 Assigning IP Addresses to an Interface .................................................................. 1-4
1.2.2 Configuring IP Address Unnumbered for an Interface ............................................ 1-7
1.2.3 Displaying and Debugging IP Address ................................................................... 1-8
1.2.4 Displaying and Debugging IP Address Unnumbered.............................................. 1-8
1.2.5 IP Address Configuration Example ......................................................................... 1-9
1.2.6 IP Address Unnumbered Configuration Example ................................................... 1-9
1.2.7 Troubleshooting IP Address Configuration ........................................................... 1-10
Chapter 2 ARP Configuration....................................................................................................... 2-1
2.1 Dynamic/Static ARP Configuration .................................................................................... 2-1
2.1.1 Introduction to Dynamic ARP .................................................................................. 2-1
2.1.2 Brief Introduction to Static ARP............................................................................... 2-1
2.1.3 Static ARP Configuration ........................................................................................ 2-1
2.1.4 Dynamic ARP Configuration ................................................................................... 2-2
2.1.5 Displaying and Debugging ARP.............................................................................. 2-3
2.2 Proxy ARP Configuration................................................................................................... 2-4
2.2.1 Introduction.............................................................................................................. 2-4
2.2.2 Application Environments for Proxy ARP................................................................ 2-4
2.2.3 Configuring Proxy ARP ........................................................................................... 2-5
2.3 Gratuitous ARP Configuration ........................................................................................... 2-5
2.3.1 Introduction to Gratuitous ARP ............................................................................... 2-5
2.3.2 Enabling the Address Learning Function of Gratuitous ARP.................................. 2-6
2.3.3 Responding to the Gratuitous ARP Requests from Other Network Segments....... 2-6
2.4 Map between WAN Interface IP Address and Link Layer Protocol Address..................... 2-7
2.5 Authorized ARP Configuration........................................................................................... 2-7
2.5.1 Introduction to Authorized ARP............................................................................... 2-7
2.5.2 Basic Concepts ....................................................................................................... 2-7
2.5.3 Structure of the ARP Packet ................................................................................... 2-9
2.5.4 ARP Table ............................................................................................................. 2-10
2.5.5 Fundamentals of Authorized ARP......................................................................... 2-10
2.5.6 Configuring Authorized ARP ................................................................................. 2-11
2.5.7 Authorized ARP Configuration Example ............................................................... 2-14
Chapter 3 DNS Configuration....................................................................................................... 3-1
3.1 DNS Overview ................................................................................................................... 3-1
3.2 Static Domain Name Resolution Configuration ................................................................. 3-1
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