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The Easy VPN Server centralizes the policy configurations for the Easy VPN Remotes and provides access to corporate resources All of your IPSec remote access policies are configured on the Servers and pushed down to the Remotes, which implement the policies This makes it easy to change policies, since they need to be
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changed only on a small number of Servers, not on any of the Remotes Easy VPN Server products that Cisco supports include the ASA and PIX security appliances, routers, and the VPN 3000 concentrators Since the concentrators are end-of-sale, the recommended platform for Easy VPN Servers is the ASA security appliances The Easy VPN Remote allows the user or users to access corporate resources securely via the Easy VPN Server Very little configuration is required on the Remote to bring up a tunnel another reason the term easy is used to describe this solution Easy VPN Remotes include the following products from Cisco: the Cisco VPN Client (runs on Windows, Macintosh, Solaris, and Linux); the Certicom and Movian clients (runs on PDAs and smart phones), and hardware clients such as the 3002, the PIX 501 and 506E; the ASA 5505; and small-end routers such as the 800s through the 3800s Easy VPN allows users to use their applications as they would without having a VPN in place; the downside of Easy VPN is that special software must be installed on user desktops, laptops, PDAs, or smart phones, or a hardware client must be deployed
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Cisco s main remote access VPN solutions are IPSec using Easy VPN
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and SSL using WebVPN Easy VPN has two components: Server and Remote
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WebVPN Unlike IPSec, which is an open standard, SSL VPNs, even though they use SSL as their protection protocol, are implemented differently by each vendor, making them proprietary SSL VPNs are one of the newest VPNs in the marketplace today Cisco s SSL VPN solution is called WebVPN and provides three secure connection methods: clientless, thin client, and the SSL VPN Client The clientless and thin client implementations use a normal web browser, with JavaScript installed, to provide the VPN solution The main advantage of this is that no special software has to be installed on a user s desktop they use the web browser that is already there! The downside of this is that the applications must be either web-based or a supported handful of non web-based applications, such as telnet The SSL VPN Client provides network-layer protection and allows users to use their day-to-day applications without any modifications And on the VPN gateway side, they are easy to set up, change policies, and add new users However, they are not as scalable or as secure as using IPSec
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It is not uncommon to see a company use both Easy VPN and WebVPN: Easy VPN is used for situations in which hardware clients are used at SOHOs or when users are using company computers, such as laptops, where it is acceptable to install the Cisco VPN Client WebVPN is commonly used when it is not possible to install Easy VPN client software, such as for business partners accessing your network or employees using airport Internet kiosks when they are traveling
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IPSec, short for IP Security, is an open standard defined across quite a few different RFCs IPSec functions at the network layer and protects IP packets IPSec can be used for L2L VPNs as well as remote access Compared to all other VPNs, it is the most secure commercial solution today, the most widely used, but the most difficult to set up and troubleshoot The next two sections will briefly cover the services IPSec offers, as well as the protocols it uses to provide for protection
IPSec Services
IPSec provides four main services:
Authentication Confidentiality Integrity
Verifying the identity of remote peers; digital signatures are used to provide identity verification via pre-shared keys or digital certificates Guaranteeing that no intermediate device can decipher the contents of the payload in a packet; encryption is used to hide the real data Guaranteeing that the contents of a packet have not been tampered with (changed) by an intermediate device; a derivative of hashing functions, called HMAC functions, is used to verify the source of every packet as well as checking if it was tampered or not Verifying that each packet is unique and not duplicated; ensuring that copies of a valid packet are not used to create a denial of service attack; protected sequence numbers are used to detect duplicate packets and drop them
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