SD WAN on the other hand is designed to enable maximum agility and flexibility. It is used when the link is to be used by users other than the router, and there are services like Fortinet which specialize in this area.

IPv4 is used for local and aggregate/geographic connectivity to an ISR (Intelligent Simultaneous Regional Access), and is best utilized when the network is hosted on a local or R2, or on R2 only. IPv6 is ideal for deployment of the Internet backbone when the network is being distributed across multiple routers, as IPv4 is not configured for this network.

Figure 1: Application and Client Network Adapter / IP Interface

Compatibility:

IPv4 is a private, unregistered Internet standard. While IPv6 was initially designed to replace IPv4 as an Internet Protocol, it can also be used to satisfy a variety of potential needs. IPv4 and IPv6 are designed to be used together in a heterogeneous network, or in environments where the Internet backbone is exposed in the form of a private Ethernet interface or routed via carrier grade routing protocol (L3). For example, a VDS or SNMP scanner can be configured to use IPv6 or IPv4 at the firewall, but still reach the network interface or network resources it is looking for. IP IPv6 addresses are 64 bits in size and are available in several prefixes, such as the /16 prefix, which consists of 001 through 255 bytes. IPv6 has evolved over the past several years and this includes the new options used to define IPv6 address families. We discuss each of the optional prefixes below. IPv6v6 and IPv6v4 prefixes will be discussed below.

Private – Non-registrable

Only clients that were established with the help of a node-to-node tunneling protocol are permitted to use IPv6. This includes Ethernet PPP connections.

Unclassified – Unregistered

Operating systems do not use the IPv6 protocol and therefore do not support IPv6. The only requirement for use of IPv6 on an operating system is that it is able to communicate with the IPv6 Internet and IPv6 resources.

Transition from IPv4 to IPv6:

For any service that was configured for IPv4 or moved from other network types to a public, interconnected or managed network, the transition to using IPv6 is a simple process.

When the destination LAN has support for IPv6, the router does not need to manually change the management of the IPv4 network that the application provider currently uses.

The use of IPv6 creates new advantages that may make the functionality of an application change, such as increased network access speed for the client or increased security for the application server.

Some applications might require a firewall to use the IPv6 protocol.

The destination LAN might not support the IPv6 protocol yet, but it is planned to add this feature at a later time.

L2 Protocol – Autonomous System Resource Management Protocol

L2 is the lowest level protocol used on the Internet. It is an autonomous system layer protocol for managing address space. L2 protocol uses a total of twelve separate L3 network devices, referred to as the LAN LAN, the local area network (LAN) or the VPN. These devices are responsible for looking up, configuring, using and managing the IP address space of the LAN. When a packet is transmitted between LAN devices, each will call on their neighbors to complete the mapping process.