The UDP length field is the length of the UDP header and data/// note : ipv6 header does not have checksum field so udp or other protocol checksum is must in it to for correct data packet IPv6 Pseudo Header.= (Source IP, Destination IP, Protocol, UDP/TCP Length (header+body)) choose src address an make it in 16 bit FD00:C001:C0DE:0077:0077:00FF

The key difference between UDP usage with IPv4 and IPv6 is that IPv6 mandates use of the UDP checksum, i.e. a non-zero value, due to the lack of an IPv6 header checksum. The lack of a possibility to use UDP with a zero-checksum in IPv6 has been observed as a real problem for certain classes of application, primarily tunnel applications. OpenPort UDP Port Checker Online tool can check if a UDP Port is open or closed. To use the tool you will have to set the remote target and port. The remote target can be an IP address or host/domain name. This is a beta version and still on test support only IPv4. We are working to add support for IPv6 UDP Port check. Should an IPv6 UDP socket that is set up to receive multicast packets also be able to receive unicast packets? 1. Reuse UdpClient vs Disposing it. 1. C# GetHostEntry The IPv6 packet carrying such a large UDP packet will necessarily include a Jumbo Payload option in a Hop-by-Hop Options header; set the Jumbo Payload Length field of that option to be the actual length of the UDP header plus data, plus the length of all IPv6 extension headers present between the IPv6 header and the UDP header. IPV6_RECVPATHMTU (RAW and UDP) Enables the receipt of IPV6_PATHMTU ancillary data on recvmsg() function calls. IPV6_RECVPKTINFO (RAW and UDP) Enables or disables returning the destination IP address of an incoming packet and the interface over which the packet was received as IPV6_PKTINFO ancillary data on recvmsg() function calls. User Datagram Protocol (UDP) and IPv6. UDP (protocol 17) is considered an upper-layer protocol by IPv4 and IPv6. UDP has not been changed for IPv6 and continues to run on top of both IPv6 and IPv4 headers. However, as shown in Figure 2-7, the Checksum field in the UDP packet is mandatory with IPv6. This field was optional in IPv4.

IPv6 UDP Checksum Considerations - IETF Tools

What’s the Difference Between TCP and UDP? Jul 03, 2017

netstat | Microsoft Docs

It got a successor by the name if IPv6, which natively supports IPSec at the IP layer, thus providing more modern security services below transport protocols such as UDP and TCP. This allows to delegate in-transit data encryption from the application to the network layer, and allows both UDP and TCP to provide exactly the same security guaranties.