By Mark Lewis
A pragmatic consultant for evaluating, designing, and deploying IPsec, MPLS Layer three, L2TPv3, L2TPv2, AToM, and SSL digital inner most networks discover the main VPN applied sciences and their purposes, layout, and configurations at the Cisco IOS® Router, Cisco® ASA 5500 sequence, and the Cisco VPN 3000 sequence Concentrator systems evaluate a few of the VPN protocols and applied sciences, examine their benefits and downsides, and comprehend their real-world purposes and strategies of integration how you can layout and enforce safe Socket Layer (SSL) VPNs, together with attention of clientless operation, the Cisco SSL VPN purchaser, the Cisco safe machine, dossier and net server entry, email proxies, and port forwarding 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 defense protocols and guidelines, multiprotocol/ multicast site visitors shipping, NAT/PAT traversal, caliber of carrier (QoS), Dynamic Multipoint VPNs (DMVPNs), and public key infrastructure (PKI) digital deepest networks (VPNs) let enterprises to attach workplaces or different websites over the web or a merchant community and make allowance cellular or home-based clients to benefit from the comparable point of productiveness as people who find themselves within the related actual situation because the important community. besides the fact that, with such a lot of flavors of VPNs on hand, businesses and companies are frequently demanding 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 most well-liked VPN applied sciences for handy reference. The publication examines the real-world operation, software, layout, and configuration of the subsequent site-to-site VPNs: Layer 2 Tunneling Protocol model three (L2TPv3)-based Layer 2 VPNs (L2VPN); Any shipping over MPLS (AToM)-based L2VPN; MPLS Layer 3-based VPNs; and IP safeguard (IPsec)-based VPNs. The booklet covers an analogous information 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. during the operation, program, and configuration information provided in every one bankruptcy, you’ll the right way to examine and distinction the varied forms of VPN applied sciences, permitting you to contemplate all suitable VPN deployment thoughts and choose the VPN applied sciences which are appropriate on your community. evaluating, Designing, and Deploying VPNs starts off with an creation of the categories of VPNs to be had. next chapters commence with an summary of the expertise, through an exam of deployment execs and cons for you to use to figure out if the actual VPN expertise is suitable to your community. specified dialogue of layout, deployment, and configuration make up the center of every bankruptcy. Appendix A deals perception into multipoint emulated LAN providers that may be deployed over a guy or WAN: digital inner most LAN carrier (VPLS) and IP-only deepest LAN provider (IPLS). when you are a community architect, community engineer, community administrator, an IT supervisor, or CIO all for deciding on, designing, deploying, and assisting VPNs, you’ll locate evaluating, Designing, and Deploying VPNs to be an integral reference. This publication is a part of the Cisco Press® Networking expertise sequence, which deals networking execs worthwhile details for developing effective networks, figuring out new applied sciences, and construction winning careers.
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Extra resources for Comparing, Designing, and Deploying VPNs
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. PE) accepts the ICRQ, it responds with an Incoming-Call-Response (ICRP) message. The ICRP can contain information such as required Layer 2–speciﬁc sublayer and circuit status. PE) to complete session setup.
The one exception is the discussion later in this chapter of static L2TPv3 sessions without a control connection between PE routers/LACs. In this case, the terms PE router and LAC may be used, but the term LCCE is not used simply because without a control connection being established, a PE router/LAC cannot be considered the endpoint of a control connection. NOTE L2TPv3 Control Connection Setup Figure 2-6 illustrates control connection setup. PE 1. SCCRQ 2. SCCRP 3. PE, in Figure 2-1) sends a Start-Control-Connection- Request (SCCRQ) message to its peer.
Geographic reach—Is geographic reach limited to a service provider backbone, or can it be extended across the Internet? Table 1-1 shows how these considerations apply to the various site-to-site VPN technologies. Remote Access VPN Deployment When deploying remote access VPNs, it is also important to have an understanding of how the various technologies compare. For this reason, a technical comparison of the various remote access VPN technologies is included in this section. Compulsory tunnel mode/NAS-initiated remote access VPNs can be deployed using the following protocols: • • • L2F PPTP L2TPv2/L2TPv3 Voluntary/client-initiated remote access VPNs can be deployed using the following protocols: • • • • PPTP L2TPv2/L2TPv3 IPsec SSL/TLS Deployments can transit IP-enabled backbone network (including Internet) Deployments using Normally1 limited Draft Martini to MPLS backbone (normally1) limited to networks MPLS backbone Deployments using Draft Martini (normally1) limited to MPLS backbone / L2TPv3 deployments can transit IP-enabled backbone network Draft Martini deployments (normally1) limited to MPLS backbone / L2TPv3 can transit any IP-enabled backbone network Geographic Reach Good (more scalable using DMVPN2) Excellent Good (in the metro area) Good (in the metro area) Good Scalability Must build topologies by provisioning P2P tunnels Inherently fully meshed (any-toany connectivity); can provision other topologies simply by controlling VPN route distribution P2P Inherently fully meshed (any-to-any connectivity) MP IPsec Must build topologies Inherently fully by provisioning P2P meshed (any-to-any pseudowires connectivity) MP IPLS Provisioning topologies (full mesh, hub and spoke, partial mesh) MP VPLS BGP/MPLS (RFC4364/ 2547bis) L3VPNs P2P VPWS L2VPNs Provider Provisioned VPNs Technical Considerations for Site-to-Site VPN Technologies Point-topoint(P2P)/ multipoint (MP) Table 1-1 Deployments can transit IPenabled backbone network (including Internet) Good (more scalable using DMVPN2) Good Deployments can transit IPenabled backbone network (including Internet) Must build topologies by provisioning P2P tunnels P2P IPsec Must build topologies by provisioning P2P tunnels P2P GRE continues Deployments can transit IPenabled backbone network (including Internet) Good Must build topologies by provisioning P2P tunnels P2P GRE Customer Provisioned VPNs 20 Chapter 1: What Is a Virtual Private Network?