Unlike IPv4, it does not use this field for this purpose and instead makes the field available to be used as a counter for which packets can expire after a certain amount of time. Anyone who has set up a custom email knows what TTL is. IPv6 fixes a problem that exists in IPv4: the Time-to-Live (TTL) field value of 30 It also contains Internet security association and key management protocol (ISAKMP) work to allow for authentication and encryption of Internet Protocol Security (IPSec). One of these is the use of message integrity check values to ensure the data has not been tampered with as it is transmitted between devices. Several security enhancements come with IPv6 that make it more secure than IPv4. IPv6 also implements one of the most important new Internet layer functions, Flow Labels, which provide Quality of Service (QoS) to IP packets. This allows for easier integration of different types of networks such as frame relay networks. ItвЂ™s more flexible and extensible than IPv4 because of its large address space and simple header format. With IPv6, the upper layers exchange messages with the transport layer via the API (Application Programming Interface).

The upper layers (TCP and UDP) exchange messages with the transport layer (TCP or UDP respectively) via sockets, but this doesnвЂ™t happen in IPv6 because IPv6 has no equivalent to IPv4вЂ™s sockets. IPv6 packets are sent to an initial node, which does not exist in IPv4.

IPv6 packets travel along with a flow label and an upper-layer protocol specified in 48 bits in the Next Header field of the IPv6 header, whereas IPv4 only has 32 bits available for this header. Then it sends over the interface that has the appropriate route. IPv4 has a more simplistic routing scheme than IPv6, which makes it faster and easier to implement as it sends packets by looking up the destination address in a routing table.

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