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Configuring IPsec Services
1-8
308630-15.1 Rev 00
Security Gateways
A security gateway establishes SAs between router interfaces configured with
IPsec software. A Nortel Networks router becomes a security gateway when you
enable IPsec on a WAN or Ethernet interface. In this way, a Nortel Networks
router operating as a security gateway provides IPsec services to its internal hosts
and subnetworks.
Hosts or networks on the external side of a security gateway (typically, the overall
Internet) are considered “untrusted.” Hosts or subnetworks on the internal side of
a security gateway (nodes on your local intranet) are considered “trusted” because
they are controlled and securely managed by the same network administration
(Figure 1-3
).
Figure 1-3. IPsec Security Gateways and Security Policies
When you add IPsec services to a router to create a security gateway, its internal
hosts and subnetworks can communicate with external hosts that directly operate
IPsec services, or with a remote security gateway that provides IPsec services for
its set of hosts and subnetworks.
Security Policies
When you create an IPsec policy, you control which packets a security gateway
protects, how it handles packets to or from particular addresses or in a particular
protocol, and whether it logs information about these actions.
There are two types of IPsec policies: inbound and outbound. An inbound policy
is used for data packets arriving at a security gateway, and an outbound policy is
used for data packets leaving a security gateway. Each IPsec interface can support
up to 127 inbound and 127 outbound security policies (refer to Figure 1-3
).
IP0078A
Untrusted
network
Local
host
Trusted
network
Outbound policy
Inbound policy (clear text only)
IPsec interface
IPsec interface
Remote
host
Outbound policy
Inbound policy (clear text only)
Security
gateway
Security
gateway
Trusted
network
- Configuring IPsec Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 308630-15.1 Rev 00 vii 7
- 308630-15.1 Rev 00 ix 9
- 308630-15.1 Rev 00 xi 11
- Before You Begin 13
- Text Conventions 14
- Acronyms 15
- Hard-Copy Technical Manuals 16
- How to Get Help 17
- Chapter 1 19
- Overview of IPsec 19
- About IPsec 20
- Supported Routers 21
- Supported WAN Protocols 21
- IPsec Services 22
- How IPsec Works 23
- IPsec Tunnel Mode 24
- IPsec Elements 25
- Security Gateways 26
- Security Policies 26
- Security Associations 29
- Security Protocols 33
- Performance Considerations 35
- Chapter 2 37
- Installing IPsec 37
- Installing the IPsec Software 38
- Securing Your Site 40
- Securing Your Configuration 40
- Creating and Using NPKs 41
- Caution: 42
- Changing an NPK 43
- Monitoring NPKs 44
- Chapter 3 45
- Starting IPsec 45
- Creating Policies 46
- Specifying an Action 47
- Policy Considerations 47
- (continued) 48
- Automated SA Creation 51
- About Manual SA Creation 53
- Chapter 4 57
- Customizing IPsec 57
- Editing a Policy 58
- Adding a Policy 59
- Reordering Policies 62
- Modifying Automated SAs (IKE) 64
- Modifying Manual SAs 65
- Disabling IPsec 67
- Appendix A 69
- Site Manager Parameters 69
- Node Protection Key Parameter 70
- IPsec Parameters 71
- IPsec Policy Parameters 72
- Appendix B 81
- Definitions of k Commands 81
- Appendix C 83
- Configuration Examples 83
- 192.32.10.0 85
- 192.32.20.0 86
- Manual SA Policy Examples 87
- RTR1 92
- RTR2 92
- RTR3 95
- RTR4 95
- Appendix D 99
- IPsec Terminology 100
- Configuration Considerations 101
- Feature Comparison Summary 102
- 308630-15.1 Rev 00 103
- BayRS Tools 104
- Contivity Tools 104
- Symptoms You May See 105
- Protocol Numbers 107
- Appendix E 107
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