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IPsec Configuration
This chapter includes these sections:
•
IPsec Overview
•
Configuring IPsec
•
Implementing ACL-Based IPsec
•
Implementing Tunnel Interface-Based IPsec
•
Configuring IPsec for IPv6 Routing Protocols
•
Displaying and Maintaining IPsec
•
IPsec Configuration Examples
NOTE:
The term
router
in this document refers to network routing devices running a routing protocol.
IPsec Overview
IP Security (IPsec) refers to a series of protocols defined by the Internet Engineering Task Force (IETF) to
provide high quality, interoperable, and cryptology-based security for IP packets. By means of facilities
including encryption and data origin authentication, it delivers these security services at the IP layer:
• Confidentiality: The sender encrypts packets before transmitting them over the Internet.
• Data integrity: The receiver verifies the packets received from the sender to ensure they are not
tampered during transmission.
• Data origin authentication: The receiver authenticates the legality of the sender.
• Anti-replay: The receiver examines packets and rejects outdated or repeated packets.
IPsec delivers these benefits:
• Reduced key negotiation overheads and streamlined IPsec maintenance by supporting the Internet
Key Exchange (IKE) protocol, which provides automatic key negotiation and automatic IPsec
security association (SA) setup and maintenance.
• Good compatibility. IPsec can be applied to all IP-based application systems and services without
any modification to them.
• Encryption on a per-packet rather than per-flow basis. This allows for flexibility and greatly
enhances IP security.
This section covers these topics:
•
Implementation of IPsec
•
Basic Concepts of IPsec
•
IPsec Tunnel Interface
•
IPsec for IPv6 Routing Protocols
•
Protocols and Standards
- Table of Contents 1
- Portal Configuration 2
- Portal System Components 3
- Portal Authentication Modes 4
- Configuration Prerequisites 8
- RADIUS Configuration 12
- Firewall Web 12
- Configuration Manual 12
- Portal Packets 13
- 2. Probe parameters 15
- Logging Off Portal Users 17
- Step2 Configure Device 21
- DHCP Configuration 24
- Functions 27
- Information Synchronization 34
- Configuration considerations 35
- Troubleshooting Portal 42
- ALG Configuration 45
- 2. Authenticating the user 46
- Enabling ALG 47
- ALG Configuration Examples 47
- # Enable ALG for NBT 50
- # Configure NAT 50
- RSH Configuration 52
- RSH Configuration Example 53
- SSH2.0 Configuration 57
- Version negotiation 58
- Authentication 58
- Session request 59
- Interaction 59
- SSH Connection Across VPNs 60
- Public Key Commands 61
- Security Volume 61
- Interface Commands 62
- System Volume 62
- Configuring an SSH User 63
- SFTP Service 80
- Working with SFTP Files 83
- Displaying Help Information 84
- SSL Configuration 91
- SSL Configuration Task List 92
- Configuration Procedure 93
- Troubleshooting SSL 97
- Web Filtering Configuration 100
- Java Blocking 101
- ActiveX Blocking 101
- Configuring Web Filtering 102
- Network requirements 103
- Configuration procedure 104
- Invalid Use of Wildcard 107
- Invalid Blocking Suffix 107
- Public Key Configuration 109
- Connection Limit Overview 118
- Verification 121
- Symptom 121
- Analysis 121
- Solution 122
- Contents 123
- Firewall configuration 124
- IPsec Configuration 129
- Implementation of IPsec 130
- Basic Concepts of IPsec 130
- Encapsulation modes 131
- IPsec Tunnel Interface 132
- Configuring IPsec 134
- Implementing ACL-Based IPsec 135
- Mirror image ACLs 137
- Protection modes 138
- Configuring an IPsec Policy 139
- NOTE: 143
- Configuring an IPsec Profile 148
- Tunneling Commands 150
- IP Services Volume 150
- IPsec Configuration Examples 152
- 2. Configure Device B 153
- Configuation procedure 157
- 3. Configure Device C 162
- IKE Configuration 165
- Operation of IKE 166
- IKE Configuration Task List 167
- Gateway 168
- Configuring an IKE Proposal 168
- Configuring an IKE Peer 169
- Setting Keepalive Timers 171
- Configuring a DPD 172
- IKE Configuration Examples 173
- Traversal 175
- Troubleshooting IKE 180
- Proposal Mismatch 181
- ACL Configuration Error 181
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