One of the important features in IPv6 header is the large address space. Both source and destination addresses are allowed to have bits. This would create a 3. The extension header contains special information like information about routing, security, etc. The most important difference between these two is the size of address space. IPv4 allows only 32 bit source and destination addresses, whereas IPv6 allows bit source and destination addresses. This makes the address space of IPv4 4.
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Search for: Search. IPv6 is an alphanumeric address whose binary bits are separated by a colon :. It also contains hexadecimal. Networks need to be configured either manually or with DHCP. IPv4 had several overlays to handle Internet growth, which require more maintenance efforts. Widespread use of NAT Network address translation devices which allows single NAT address can mask thousands of non-routable addresses, making end-to-end integrity achievable.
Table 2. Source Address Source Address The network layer identifier of the sender of the packet. Destination Address Destination Address The network layer identifier of the receiver of the packet. Fields that have the same functionality but their names were changed Type of Service Traffic Class Used for traffic classification and marking. In IPv4 the length includes both the IP header and the data. In IPv6, the length includes the data plus any extension headers but does not include the main IP header.
Time to Live Hop Limit Both fields have the same function. They ensure that packets do not loop around the network indefinitely. Protocol Next Header Indicates the protocol being transported in the payload portion. In IPv6, it could also indicate the existence of an extension header. It is not needed in IPv6, because the v6 header is a fixed-length - 40 bytes. In IPv6, only the source of the packet is performing fragmentation using the Fragmentation extension header.
Header Checksum After many years of experience, the designers of IPv6 decided that this field is redundant and not necessary anymore because there are checksum fields in the upper layer protocols. Options Options are now handled using the extension headers in IPv6, so this field is not necessary. Padding Because IPv6 is fixed-sized, padding is not necessary. Fields that are new in IPv6 and do not exist in IPv4 Flow Label A new field in IPv6 that is used for identifying that a packet is part of a sequence and has to be handled the same way as the entire traffic flow.
Log in or register to post comments. Fields that have the same functionality and the same name in IPv4 and IPv6. The network layer identifier of the sender of the packet. The network layer identifier of the receiver of the packet.
Fields that have the same functionality but their names were changed. Protocol — It is an 8-bit field that describes the protocol of receiving the data payload. Source IP address — It is a bit address that describes the address of the device that sends the packet. Destination IP address — It is a bit address that describes the address of the receiving end. Moreover, it is similar to the IPv4 ToS field. Flow label — It is bit long.
Moreover, it indicates the position of the packet in a set of packets and helps to prioritize the packets, especially when transmitting voice. Payload length — It is bit long and displays the length of IPv6 payload with the extension headers and upper layer protocol data.
Next Header — It is an 8-bit field that shows the type of the first extension or the protocol in the upper layer. Hop Limit — It is 8-bit long. It indicates the maximum number of routers the packet is capable of passing.
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