IPSec

Counterpane Internet Security analyzes the protocol: "Even with all the serious critisisms that we have on IPsec, it is probably the best IP security protocol available at the moment."

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"This Tech Tip means to give bottom-up coverage of the low-level protocols used in an IPv4 context (we provide no coverage of IPv6). This is not a deployment guide or best-practices document — we're looking at it strictly at the protocol level on up, rather than from the big picture on down."

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The purpose of this document is to introduce IPSec to users in a rapid, but concise format. You will see basic configurations of Internet Key Exchange (IKE) with pre-shared keys, IKE with a Certification Authority, and IPSec.

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Use this sample configuration to encrypt Layer 2 Tunneling Protocol (L2TP) traffic using IPSec for users dialing in. From Cisco.

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IETF working group: RFCs and draft RFCs.

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IPSec tutorials, whitepapers, standards, implementations, links and books.

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Using IPSec on NetBSD.

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"Building a virtual private network (VPN) using IP Security Protocol (IPSec) is a popular cost-saving approach to wide area networking. One disadvantage of using a VPN is the scarcity of convenient tools to provide resilience in the face of router, firewall, or network failure. The challenge is to automatically detect failure of an IPSec connection so that an alternate route can be used. This white paper looks at two different approaches Networking Unlimited, inc. has used to meet the challenge: using a GRE tunnel to make the IPSec transport appear as a point-to-point link so that conventional routing protocols such as OSPF or EIGRP can be used, and using a routing protocol which does not require 'neighbors' to be adjacent such as BGP directly over the IPSec transport. Example Cisco router configurations, adapted from production networks designed by Networking Unlimited, Inc., are provided for each approach."

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Rating: 10.00
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This guide focuses on the fastest way to use IPSec transport mode to secure application traffic between a client and a server. It demonstrates how to enable security using IPSec default policies between two Windows 2000-based systems that belong to a Windows 2000 domain.

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"Recently it has come to my attention that I don’t know as much about VPN as I wanted to know so I started to do research, I was able to find good material on almost every aspect of it except IPSEC. Most of the papers I found on it were either too long, or too short, or didn’t go in detail enough or were written in about 150% English which made reading them so dry I had to have a high caffeine drink every 10-15 minutes. So I decided to write my own paper to assist other people in their studies of security and IPSec." Linux Exposed, 01/10/05.

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Rating: 7.00
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"We present a practical, portable implementation of this design, based on the KeyNote trust-management language, that works with a variety of Unix-based IPsec implementations." In PDF.

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"Describes how to configure Microsoft Windows 2000 IPSec and Windows XP IPSec to help secure an internal network server against network-based attacks from untrusted computers. IPSec enhancements in Windows 2000 service packs and in the Microsoft Windows Server 2003 family are also described." By Microsoft and Foundstone Strategic Strategy.

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