By Mark Lewis
A realistic 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 structures examine some of the VPN protocols and applied sciences, research their benefits and drawbacks, and comprehend their real-world purposes and techniques of integration the way to layout and enforce safe Socket Layer (SSL) VPNs, together with attention of clientless operation, the Cisco SSL VPN shopper, the Cisco safe machine, dossier and net server entry, e mail proxies, and port forwarding easy methods to install 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 rules, multiprotocol/ multicast site visitors delivery, NAT/PAT traversal, caliber of provider (QoS), Dynamic Multipoint VPNs (DMVPNs), and public key infrastructure (PKI) digital deepest networks (VPNs) permit corporations to attach workplaces or different websites over the net 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 comparable actual place because the principal community. besides the fact that, with such a lot of flavors of VPNs on hand, businesses and prone are usually tough pressed to spot, layout, and set up the VPN ideas which are wonderful for his or her specific community structure and repair wishes. evaluating, Designing, and Deploying VPNs brings jointly the preferred VPN applied sciences for handy reference. The e-book examines the real-world operation, program, layout, and configuration of the subsequent 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 safeguard (IPsec)-based VPNs. The ebook covers an identical info for the subsequent 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 every one bankruptcy, you’ll evaluate and distinction the varied forms of VPN applied sciences, allowing you to contemplate all proper VPN deployment thoughts and choose the VPN applied sciences which are appropriate in your community. evaluating, Designing, and Deploying VPNs starts with an advent of the categories of VPNs to be had. next chapters commence with an summary of the know-how, via an exam of deployment execs and cons so that you can use to figure out if the actual VPN know-how is suitable to your community. targeted 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 provider (VPLS) and IP-only deepest LAN carrier (IPLS). when you are a community architect, community engineer, community administrator, an IT supervisor, or CIO excited by determining, designing, deploying, and aiding VPNs, you’ll locate evaluating, Designing, and Deploying VPNs to be an critical reference. This publication is a part of the Cisco Press® Networking expertise sequence, which bargains networking execs important details for developing effective networks, knowing new applied sciences, and development profitable careers.
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Additional resources for Comparing, Designing, and Deploying VPNs
A common question asked about L2VPNs (including L2TPv3-based L2VPNs) is why they might be preferred over Layer 3 site-to-site VPNs and when their deployment might be suitable. L2TPv3 pseudowire (emulated circuit)-based L2VPNs are typically deployed by service providers in order to consolidate legacy and newer IP network infrastructure and offer newer Ethernet-based WAN connectivity to their customers. Figure 2-1 illustrates an L2TPv3-based L2VPN. PE. CE Ethernet Connection Frame Relay Connection PPP Connection Benefits and Drawbacks of L2TPv3-Based L2VPNs For service providers, some of the main beneﬁts and drawbacks of deploying L2TPv3based L2VPNs are as follows: • L2TPv3 requires only an IP-enabled backbone.
Packets are switched based on labels prepended to the packet. LSPs may be signaled using the Tag Distribution Protocol (TDP), the Label Distribution Protocol (LDP), or the Resource Reservation Protocol (RSVP). Technologies and Protocols Used to Enable Remote Access VPNs Protocols used to enable remote access VPNs (discussed later in this chapter) include the following: • The Layer Two Forwarding (L2F) Protocol—L2F is a Cisco proprietary protocol that is designed to allow the tunneling of PPP (or Serial Line Interface Protocol [SLIP]) frames between a NAS and a VPN gateway device located at a central site.
The LAC-to-LAC model is used to conﬁgure the L2TPv3 pseudowire-based VPNs discussed in this chapter. ” Figure 2-1 illustrates the LAC-to-LAC deployment model. NOTE A pseudowire is an emulated circuit that crosses a PSN. One pseudowire corresponds to one L2TPv3 session. L2TPv3 Pseudowire Operation 31 L2TPv3 Message Types L2TPv3 uses two types of message: • • Control connection messages—Used for signaling between LCCEs Session data (channel) messages—Used to transport Layer 2 protocols and connections Figure 2-2 shows the format of control channel and session data (channel) messages.