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7-3
Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide
OL-6426-02
Chapter 7 Configuring VPNs Using an IPSec Tunnel and Generic Routing Encapsulation
Configure a VPN
Configure a VPN
Perform the following tasks to configure a VPN over an IPSec tunnel:
• Configure the IKE Policy
• Configure Group Policy Information
• Enable Policy Lookup
• Configure IPSec Transforms and Protocols
• Configure the IPSec Crypto Method and Parameters
• Apply the Crypto Map to the Physical Interface
Configure the IKE Policy
Perform these steps to configure the Internet Key Exchange (IKE) policy, beginning in global
configuration mode:
Command or Action Purpose
Step 1
crypto isakmp policy priority
Example:
Router(config)# crypto isakmp policy 1
Router(config-isakmp)#
Creates an IKE policy that is used during IKE
negotiation. The priority is a number from 1 to
10000, with 1 being the highest.
Also enters Internet Security Association Key and
Management Protocol (ISAKMP) policy
configuration mode.
Step 2
encryption {des | 3des | aes | aes 192 | aes 256}
Example:
Router(config-isakmp)# encryption 3des
Router(config-isakmp)#
Specifies the encryption algorithm used in the IKE
policy.
The example uses 168-bit Data Encryption
Standard (DES).
Step 3
hash {md5 | sha}
Example:
Router(config-isakmp)# hash md5
Router(config-isakmp)#
Specifies the hash algorithm used in the IKE
policy.
The example specifies the Message Digest 5
(MD5) algorithm. The default is Secure Hash
standard (SHA-1).
Step 4
authentication {rsa-sig | rsa-encr | pre-share}
Example:
Router(config-isakmp)# authentication
pre-share
Router(config-isakmp)#
Specifies the authentication method used in the
IKE policy.
The example uses a pre-shared key.
- Text Part Number: OL-6426-02 1
- CONTENTS 3
- 14 Troubleshooting 1 7
- 4 Reference Information 7
- B Concepts 1 8
- C ROM Monitor 1 9
- Contents 10
- OL-6426-02 10
- Audience 11
- Organization 12
- Conventions 13
- Related Documents 14
- Obtaining Documentation 14
- Cisco.com 15
- Documentation DVD 15
- Ordering Documentation 15
- Documentation Feedback 16
- Submitting a Service Request 17
- Getting Started 21
- Basic Router Configuration 23
- Configuring Basic Parameters 27
- Configure Global Parameters 28
- Configure WAN Interfaces 29
- Verifying Your Configuration 32
- Configuring Static Routes 34
- Configuring Dynamic Routes 35
- Configuring RIP 36
- Configuring Enhanced IGRP 37
- DSL Access 39
- Sample Network Deployments 41
- Internet 43
- Example 1: 49
- Example 2: 49
- Configuring ADSL 58
- Configuring SHDSL 59
- Verify the Configuration 60
- Configure DHCP 66
- Configure VLANs 69
- Switch Port Configurations 71
- VLAN Trunking Protocol (VTP) 72
- 802.1x Authentication 72
- Layer 2 Interfaces 73
- MAC Table Manipulation 73
- Switched Port Analyzer (SPAN) 73
- IP Multicast Switching 73
- Per-Port Storm Control 74
- Fallback Bridging 74
- IGMP Snooping 74
- Cisco Easy VPN 76
- Configure the IKE Policy 77
- Enable Policy Lookup 80
- Generic Routing Encapsulation 87
- GRE Tunnels 88
- Configure a VPN 89
- Configure a GRE Tunnel 94
- Configuring a Simple Firewall 99
- Configuration Tasks 100
- Configure Access Lists 101
- Configure Inspection Rules 101
- Configuration Example 103
- Configuration Example 104
- Example: 106
- Configure Bridging on VLANs 108
- Sample Configuration 113
- Troubleshooting 119
- Configuring Security Features 123
- Configuring AutoSecure 124
- Configuring Access Lists 124
- Configuring a CBAC Firewall 125
- Configuring VPNs 126
- Management 127
- Floating Static Routes 128
- Dialer Watch 130
- ISDN S/T Port 135
- V.92 Modem 139
- Line Configuration 141
- ADSL Troubleshooting 144
- SHDSL Troubleshooting 144
- PortFast Troubleshooting 144
- ATM Troubleshooting Commands 145
- For ATM Interfaces 146
- Software Upgrade Methods 151
- Recovering a Lost Password 151
- Reset the Router 153
- Managing Your Router with SDM 155
- Reference Information 157
- APPENDIX 159
- Understanding Command Modes 160
- Getting Help 162
- Using Commands 164
- Saving Configuration Changes 165
- Where to Go Next 165
- Where to Go Next 166
- Concepts 167
- Network Protocols 168
- Routing Protocol Options 168
- PPP Authentication Protocols 169
- Appendix B Concepts 170
- Network Interfaces 171
- Dial Backup 172
- Easy IP (Phase 1) 174
- Easy IP (Phase 2) 174
- IP Precedence 175
- Low Latency Queuing 176
- Access Lists 177
- Access Lists 178
- ROM Monitor 179
- ROM Monitor Commands 180
- Command Descriptions 181
- Required Variables 182
- Optional Variables 182
- Configuration Register 184
- Console Download 185
- Debug Commands 186
- Exiting the ROM Monitor 187
- Appendix C ROM Monitor 188
- Exiting the ROM Monitor 188
- Common Port Assignments 189
- Numerics 191
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