![]() IPv6 addresses are expressed as 32 hexadecimal digits separated into 8 groups of 4 digits separated by a colon. Zeros at the beginning of each portion of the address may be deleted. Similarly, multicast addresses always start with FF0x (the x represents a hexadecimal digit letter between 1 and 8). The local link interface addresses always begin with FE80. One of those types is the link local address that configures itself at every interface that has enabled the IPv6 protocol. Every four hexadecimal characters are separated by a colon. IPv6 addresses are 128 bits long and are expressed in hexadecimal numbers. Each octet of the address is represented in decimal, taking a possible value between 0 and 255. IPv4 addresses are 32 bits long and are represented as four octets separated by periods. So let’s see some notable concepts that you need to know about IPv6. The implementation of IPv6 is currently in a mass scale and thus we must be ready to learn some significant differences over IPv4.Īlso, some IP addressing terms will start to appear with increasing frequency in our day to day work. Success rate is 100 percent (5/5), round-trip min/avg/max = 0/8/28 ms Important Points to Know About IPV6 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. 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 ( ::).
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