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. Study the OSI networking model for more details.)
The address itself is only meaningful in the context of a given network segment. The loopback addresses (both in IPv4 and IPv6) is an address which represents the same interface of a computer. (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. The loopback address listed in the table above may be used by a node to send an IPv6 packet to. For our purposes, you want the one that says "scope link" after it. The hexadecimal letters in IPv6 addresses are not case-sensitive. 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 Scroll down to find the loopback interface (127.0.0.1 or ::1), and select option 9 (Start) from the Work with TCP/IP interface. Select option 1 (Work with TCP/IP interface status) for IPv4 interfaces, or select option 4 (Work with IPv6 interface status) for IPv6 interfaces. You can find these by running ip -6 addr eth0. To activate the loopback interface: At the command line, type NETSTAT. 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.
#Loopback ipv6 how to
You have to tell one host how to reach another host. Just as you can do this with IPv4, this is called routing.
Click the below links to learn more about how to simplify and shorten an IPv6 address.Yes. This unspecified address is so lengthy and can be further simplified as ::/0. IPv4 and IPv6 routers will not forward packets with the unspecified address. (Example, the Operating System is configured to obtain an IP address dynamically using DHCP, and the machine is in the process of obtaining an IP address from the DHCP server) Unspecified address is used by an Operating System, before an IPv4 address or IPv6 address is configured on it. In IPv4, the IPv4 address used as Unspecified address is 0.0.0.0/0. Unspecified address in IPv6 is the IPv6 address with all binary bits set to "0". Click the below links to learn more about how to simplify and shorten an IPv6 address. This loopback address is so lengthy and can be further simplified as ::1/128.
#Loopback ipv6 full
Rest of the addresses in 127.0.0.0/8 are not widely used. Since its ibgp I have a igp ( ospv3) that has full connectivity between the ibgp routers I can ping and have reachability between the ipv6 loopback. But almost all leading operating systems use the name "localhost" to represent an IPv4 loopback address 127.0.0.1. In IPv4, we have an entire network (127.0.0.0/8) reserved as loopback addresses. The loopback addresses are typically used by programmers for development and testing of network applications without even having network configurations. Whenever we communicate to a loopback address (both in IPv4 and IPv6) the TCP/IP protocol stack will loop the packets back on the same interface, without even leaving the interface.
The loopback addresses (both in IPv4 and IPv6) is an address which represents the same interface of a computer.
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