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Configuring IPsec Services
1-2
308630-15.1 Rev 00
About IPsec
IP Security is the IETF set of emerging standards for security services for
communications over public networks. The standards are documented in the IETF
Requests for Comments (RFCs) 2401 through 2412. Additional RFCs may be
relevant as well.
These standards were developed to ensure secure, private communications for the
remote access, extranet, and intranet virtual private networks (VPNs) used in
enterprise communications. They are the security architecture for the next
generation of IP, called IPv6, but are available for the current IPv4 Internet as
well.
The Nortel Networks implementation of the IETF standards provides network
(layer 3) security services for Ethernet and wide area network (WAN)
communications on Nortel Networks routers.
Configuring IPsec and NAT on One Interface
You can configure both IPsec and unidirectional Network Address Translation
(NAT) on the same router interface. However, the address ranges that you
configure for NAT and in IPsec policy filters cannot overlap.
You configure IPsec using Site Manager. You can configure NAT using either the
BCC or Site Manager. When you configure IPsec and NAT on the same router
interface, IPsec
and NAT
operate independently and do not pass traffic to each
other.
When you configure both IPsec and NAT on the same router interface, NAT takes
precedence over IPsec. For example, if the destination address of an incoming IP
packet does not match any configured NAT public address, then the packet is
processed by IPsec. If the IP packet contains an address that falls within the
configured range of an IPsec policy, then the packet is either protected, bypassed,
or dropped. A packet with a source address not within any IPsec policy range will
be dropped.
Note:
Router interfaces configured for bidirectional NAT do not support
IPsec.
- 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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