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#A LOOPBACK IP ADDRESS BEGINS WITH WHAT NUMBER MANUAL#

Sending 5, 100-byte ICMP Echos to 2000:0:0:C::2, timeout is 2 seconds: Let’s now go back to R1 and verify if we can ping the IPv6 address 2000:0:0:C::2 on interface S0/0 of R2. Let’s now proceed to configure IPv6 addresses on R2 and R3 as well. ND DAD is enabled, number of DAD attempts: 1 ICMP error messages limited to one every 100 milliseconds Let’s now verify if IPv6 addresses have been correctly configured using commands show ipv6 interface brief and show ipv6 interface as show below.įastEthernet0/0 is up, line protocol is up Let’s first configure interfaces Fa0/0 and S0/0 of R1:Įnter configuration commands, one per line. The figure shows two IPv6 subnet numbers with the two links. Let’s now configure IPv6 addresses for the network shown in Figure 2.

#A LOOPBACK IP ADDRESS BEGINS WITH WHAT NUMBER MANUAL#

For one option, you configure the entire 128-bit IPv6 address, and for the other, you just configure the 64-bit prefix and tell the device to use an EUI-64 calculation for the interface ID portion of the address.Įxtended Unique Identifier or EUI-64 format allows a host to automatically assign itself a unique 64-bit IPv6 interface identifier without manual configuration.īoth options result in the router interface learning its full 128-bit IPv6 address and prefix-length, one way or the other. There are two options for static configuration of IPv6 addresses on Cisco routers. There are further categories in unicast addresses one of which is IPv6 global unicast addresses.Īn IPv6 global unicast address is similar to a public IP address in IPv4, that is, an IP address that can be routed across the public Internet. There are three general types of IPv6 addresses: unicast, multicast, and anycast. So we have the following valid abbreviation for the above IPv6 address.

Even if we have more consecutive zeros later on, only one time is allowed to have the double colon notation in the IP. The leftmost consecutive quartets of all 0s can be represented with double colon ( ::). Represent consecutive quartets of all 0s with double colon (or :: ) but only for one such occurrence in a given address.However you must leave at least one number in any quartet.

Omit the leading 0s in any given quartet.

Two conventions are used to shorten what must be typed for an IPv6 address: IPv6 conventions write the 128 bit IPv6 address as 8 quartets of hex digits, separated by colons, for example:Īs you can see, IPv6 addresses are lengthy even in hexadecimal. IPv6 on the other hand can support 2 128 = 3.4 * 10 38 addresses, a number so large that it would solve the scarcity of IP address space once and for ever. IPv4 can support 2 32 = 4,294,967,296 or over four billion unique addresses but this address space has almost been exhausted due to immense expansion in the size of the Internet over the years. IPv6 increases the IP address size from 32 bits to 128 bits to support a much greater number of addressable hosts. IP version 6 (IPv6) is the new version of the Internet Protocol (IP), intended to replace the older IPv4 which is still employed on the vast majority of Internet hosts.