User Guide

6 Table of Contents
Configuring MAC Encapsulated Routing: RFC 1483MER / RFC 1490MER with IP Routing 48
Configuring FRF8 with IP Routing 49
Configuring Mixed Network Protocols 50
Configuring a Dual-Ethernet Router for IP Routing 51
Verify the Router Configuration 52
Test IP Routing 52
Test Bridging to a Remote Destination 52
Test IPX Routing 53
Sample Configurations 54
Sample Configuration 1: PPP with IP and IPX 54
Sample Configuration 2: RFC 1483 with IP and Bridging 62
Sample Configuration 3: Configuring a Dual-Ethernet Router for IP Routing 68
Chapter 4. Configuring Special Features 69
Bridge Filtering and IP Firewall 69
General Information 69
Configure Bridge Filtering 69
Enable/Disable Internet Firewall Filtering 70
IP (RIP) Protocol Controls 71
Dynamic Host Configuration Protocol (DHCP) 72
General Information 72
Manipulating Subnetworks and Explicit Client Leases 73
Setting Option Values 75
BootP 77
Defining Option Types 79
Configuring BootP/DHCP Relays 80
Other Information 80
Network Address Translation (NAT) 80
General NAT Rules 80
Masquerading 81
Classic NAT 84
Client Configuration 85
Management Security 87
Disable Telnet and SNMP 87
Restore Telnet and SNMP 87
Validation of Telnet and SNMP Clients 87
Restrict Remote Access 88
Changing the SNMP Community Name 88
Disable WAN Management 88
System Log 89
Software Option Keys 89
Encryption 89
PPP DES (RFC 1969) Encryption 90
Diffie-Hellman Encryption 92
IP Filtering 93
Filters and Interfaces 93
Configuring Filters with Network Address Translation Enabled 94
Filter Actions 95
IP Filter Commands 95
Special Notes 95
L2TP Tunneling — Virtual Dial-Up 96
Introduction 96
L2TP Concepts 96
Configuration 99