…e 22] RFC 8085 UDP Usage Guidelines March 2017 3.4.1 . IPv6 Zero UDP Checksum [ RFC6935 ] defines a method that enables use of a zero UDP zero- checksum mode with a tunnel protocol, providing that the method satisfies the requirements in [ RFC6936 ]. The application MUST implemen…

…ent can be undermined when using UDP as a tunnel with no UDP checksum (as per [ RFC6935 ][RFC6936]) when fragmentation occurs because the egress has no checksum with which to validate reassembly. For this reason, it is safe to use UDP with a zero checksum for atomic tunnel link p…