Comparing, Designing, and Deploying VPNs by Mark Lewis

By Mark Lewis

A pragmatic consultant for evaluating, designing, and deploying IPsec, MPLS Layer three, L2TPv3, L2TPv2, AToM, and SSL digital deepest networks discover the main VPN applied sciences and their functions, layout, and configurations at the Cisco IOS® Router, Cisco® ASA 5500 sequence, and the Cisco VPN 3000 sequence Concentrator systems examine some of the VPN protocols and applied sciences, study their merits and downsides, and comprehend their real-world functions and techniques of integration how you can layout and enforce safe Socket Layer (SSL) VPNs, together with attention of clientless operation, the Cisco SSL VPN consumer, the Cisco safe computer, dossier and internet server entry, electronic mail proxies, and port forwarding how you can installation scalable and safe IPsec and L2TP distant entry VPN designs, together with attention of authentication, encryption, split-tunneling, excessive availability, load-balancing, and NAT transparency grasp scalable IPsec site-to-site VPN layout and implementation together with configuration of safety protocols and regulations, multiprotocol/ multicast site visitors delivery, NAT/PAT traversal, caliber of carrier (QoS), Dynamic Multipoint VPNs (DMVPNs), and public key infrastructure (PKI) digital inner most networks (VPNs) permit corporations to attach places of work or different websites over the web or a merchant community and make allowance cellular or home-based clients to benefit from the related point of productiveness as those people who are within the similar actual situation because the primary community. notwithstanding, with such a lot of flavors of VPNs on hand, businesses and prone are frequently difficult pressed to spot, layout, and set up the VPN ideas which are superb for his or her specific community structure and repair wishes.   evaluating, Designing, and Deploying VPNs brings jointly the most well-liked VPN applied sciences for handy reference. The booklet examines the real-world operation, program, layout, and configuration of the next site-to-site VPNs: Layer 2 Tunneling Protocol model three (L2TPv3)-based Layer 2 VPNs (L2VPN); Any delivery over MPLS (AToM)-based L2VPN; MPLS Layer 3-based VPNs; and IP protection (IPsec)-based VPNs. The ebook covers an analogous info for the next distant entry VPNs: Layer 2 Tunneling Protocol model 2 (L2TPv2) VPNs; L2TPv3 VPNs; IPsec-based VPNs; and safe Socket Layer (SSL) VPNs. throughout the operation, software, and configuration info provided in each one bankruptcy, you’ll methods to examine and distinction the varied forms of VPN applied sciences, allowing you to think about all proper VPN deployment suggestions and choose the VPN applied sciences which are fabulous on your community.   evaluating, Designing, and Deploying VPNs starts off with an advent of the categories of VPNs to be had. next chapters commence with an summary of the expertise, via an exam of deployment execs and cons that you should use to figure out if the actual VPN know-how is suitable to your community. special dialogue of layout, deployment, and configuration make up the guts of every bankruptcy. Appendix A deals perception into multipoint emulated LAN providers that may be deployed over a guy or WAN: digital deepest LAN carrier (VPLS) and IP-only deepest LAN carrier (IPLS).   when you are a community architect, community engineer, community administrator, an IT supervisor, or CIO focused on picking, designing, deploying, and aiding VPNs, you’ll locate evaluating, Designing, and Deploying VPNs to be an essential reference.   This booklet is a part of the Cisco Press® Networking know-how sequence, which deals networking execs necessary details for developing effective networks, figuring out new applied sciences, and development profitable careers.  

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VPN Devices Figure 1-2 7 User-Facing and Network-Facing PE Devices U-PE Device CE Device N-PE Device CE Device U-PE Device VPN Site 3 N-PE Device Provider Network (VPN Backbone) VPN Site 1 N-PE Device U-PE Device CE Device VPN Site 2 Other device types used in VPNs include Network Access Servers (NAS) and VPN gateways/concentrators. A NAS is a device that interfaces between an access network (such as a Public Switched Telephone Network [PSTN]) and a packet-switched network (such as an IP backbone).

PE in highlighted line 1. In highlighted line 2, the tunnel (control channel) state changes from established to idle. The control channel has been torn down. That is control channel setup and teardown. But how about L2TPv3 session setup and teardown? L2TPv3 Session Setup After a control connection has been set up (see Figure 2-6), dynamic session (pseudowire) establishment can begin, as shown in Figure 2-8. PE 1. ICRQ 2. ICRP 3. PE, in this example). The ICRQ can include information such as pseudowire type, required Layer 2–specific sublayer, and circuit status.

Configuring and Verifying L2TPv3 Pseudowires 41 Another function of the control channel is to signal circuit status changes using the SLI message as illustrated in Figure 2-11. Figure 2-11 Signaling Circuit Status Changes Using the SLI Message 1. CE 2. PE using the SLI message. NOTE For detailed, step-by-step, information on debugging and troubleshooting L2TPv3-based VPNs, refer to Troubleshooting Virtual Private Networks by Mark Lewis (Cisco Press). Configuring and Verifying L2TPv3 Pseudowires As previously mentioned, you configure L2TPv3-based pseudowires in two ways: • • Using dynamic L2TPv3 session setup Using static L2TPv3 session setup As described earlier in this chapter, dynamic L2TPv3 session setup requires the exchange of control channel messages, whereas static L2TPv3 session setup does not require the exchange of any control channel messages.

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