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Figure 139 Security gateway
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difficulty of accessing and invading carrier layer 2 networks and private IP networks deters casual intruders The additional overhead of adding encryption to a physically protected optical network may overprice the service without a real improvement in security The service provider may manage encryption devices and/or firewalls at the customer site Of course, when this is done, the control channels to the security devices must themselves be secure User connectivity may be defined to include security using a variety of security mechanisms, including IPSec, L2TP, and so on These various mechanisms may provide other services, such as connectivity L2TP can provide per-user authentication, or may have no security functions Security may be requested on a discretionary basis by end user hosts, or the VPN may enforce a mandatory security policy Cryptographic protections may be under the control of the enterprise, using host-to-host or host-to-security gateway methods, or the infrastructure may be trusted to provide encryption The responsibilities for user authentication, device authentication, encryption, logging, and audit must be specified as part of the design of any practical VPN
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To ask the fundamental question of operational policy, think of the theme song from the movie Ghostbusters: Who ya gonna call If you do not define clearly who has responsibility for adding hosts and sites to the VPN, troubleshooting the VPN and applications on it, and doing continuing capacity planning, your VPN will be haunted by evil spirits Operational responsibilities can be assigned to the enterprise, service provider(s), or consultants The provider may place equipment under its control at the customer sites, or the VPN boundary may start at a provider POP Those VPNs accessed through the bandwidth provider are purely customer-operated from the VPN standpoint; the telephone provider is unaware of their existence Another aspect of the model is whether clients are aware of the VPN and whether provider access components are aware of it In principle, a client could attach to a generic ISP, establish an encrypted tunnel to a destination host, and operate transparently to the ISP The VPN provider may be the ISP In such cases, the VPN provider s responsibility is to provide logins and connectivity The login might specify a class of service to be used in the provider network
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Having addresses is not optional Managing and assigning customer addresses are optional capabilities of a VPN service The VPN may provide address assignment, presumably with DHCP or proxies used with IPCP or L2TP VPNs most commonly use private addressing When Internet connectivity is needed, the firewall has both inside and outside addresses DNS services may be associated with
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the VPN, and operated by the enterprise or the service provider When the VPN provides dynamic addressing, the dynamic address server (DHCP, IPCP, and so on) should dynamically update the DNS zone seen by the members of the VPN Addressing becomes more complex with extranets It may be desirable to use registered addresses, perhaps with the restriction that they do not need global Internet routability Address registries may be somewhat relaxed in their assignment rules when the requesting organization makes clear that it does not expect global routability and is willing to renumber if global routability becomes a need When pointy-haired bosses demand the instantaneous interconnection of several enterprises intranets, crying, Ready! Fire! Aim! , it is entirely common to find that the intranets all use the [RFC 1918] private address space and some of the addresses overlap Routing with overlapping addresses, if I remember correctly, is in the fifth or sixth circle of Dante s nine-ringed hell
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When a network is down, its quality of service is by definition unacceptable The enterprise may specify availability requirements for the infrastructure and for VPN gateway services The implementer of the VPN needs to translate these user requirements into requirements for underlying fault tolerance mechanisms The VPN may provide quality of service support It may either accept QoS requests from end users signaled with RSVP, IP precedence bits, and so on, or internally assign QoS requirements to be mapped to the transmission infrastructure For quality of service to be effective, either the infrastructure must support explicit quality of service requests or there must be a high level of confidence that the infrastructure consistently provides adequate QoS Assumptions about QoS need to be stated as part of any VPN design Requirements for QoS will restrict the transports that can be used for your VPN VPNs based on the public Internet, and to some extent those based on the PSTN, inherit the unreliable QoS properties of their transports
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