While NATs promote reuse of the private address space, they do not support standards-based network layer security or the correct mapping of all higher layer protocols. As a result, some organizations are forced to use a network address translator (NAT) to map multiple private addresses to a single public IP address. IPv4 addresses have become relatively scarce. The recent exponential growth of the Internet and the lack of IPv4 address spaces. However, the initial design did not anticipate the following variables: IPv4 has proven to be robust, easily implemented and interoperable, and has stood the test of scaling an inter-network to a global utility the size of today's Internet. The current version of IP (which is known as IP version 4 or IPv4) has not been substantially changed since RFC 791 was published in 1981.
Ipv6 loopback how to#
Once you have that entry in host B's routing table, you should be able to ping host A's custom address from host B, since host B now knows to use host A's link local address as a router to reach that address.This article describes how to install and configure IP version 6 (IPv6) in a Microsoft Windows Server 2003 Enterprise Edition environment.Īpplies to: Windows Server 2003 Original KB number: 325449 Summary Study the OSI networking model for more details.) The address itself is only meaningful in the context of a given network segment. (That's the tricky thing about link-local addresses.
What we're doing is telling host B's kernel that it can reach fd56:dcaa:2099::1 (host A's special address on its loopback interface) at fe80::5520:a68f:5416:a68c (host A's link-local address on its eth0 interface), but that host B needs to try to reach fe80::5520:a68f:5416:a68c from host B's eth0 interface. You do that by adding a entry to host B's routing table: # ip route add fd56:dcaa:2099::1 via fe80::5520:a68f:5416:a68c dev eth0 To allow host B to reach host A's special loopback address, host B needs to know where to find it. On host B, let's also has an interface eth0. For our purposes, you want the one that says "scope link" after it.
In that list are four different addresses (you may have more). Valid_lft 593594sec preferred_lft 74600sec Here's an example from my system: $ ip -6 addr show eth0 You can find these by running ip -6 addr eth0. In IPv6, it'll have an IPv6 link local address.
Host A also has an Ethernet interface, let's call it eth0. You should use ULA addresses for purposes like these.) I chose this from a Unique Local Address. (In my example, the custom address is going to be fd56:dcaa:2099::1. Host A has its default loopback address of ::1 as well as your custom address on the loopback interface. You have to tell one host how to reach another host. Just as you can do this with IPv4, this is called routing.