Both standards are extensive and many features are less obvious and important for only some environments. Here are some of the major differences between IPv4 and IPv6. It is possible for IPv4 and IPv6 subnets to exchange traffic but there are issues that vary depending upon the network configuration and the type of network traffic. It has been more of an issue of getting the infrastructure in place to make the move to cause the minimal number of problems. The movement to IPv6 on a global scale is inevitable. For example, the header checksum field has been eliminated because transport reliability has gone up and its overhead was unnecessary. The larger address space is one reason to migrate to IPv6 but there are many more differences that give IPv6 an advantage. 2) cousin, except for the leading version field. We are actually running out of addresses but have not fear, the Internet Engineering Task Force (IETF) is here with IPv6. IPv4 uses 32-bit source and destination address fields. If you are using Internet or almost any computer network you will likely using IPv4 packets.
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