Related issue: UDP over IPv6

2292bis
Senders can devide data to be sent at the minimum MTU, 1280.
the IPV6_USE_MIN_MTU socket option.
Senders can avoid path MTU discovery.

Example algorithm for DNS servers
If a UDP/IPv6 sender knows the size of path MTU, divide a packet into fragments of the size
Else
If the sender is capable of 2292bis, divide the packet into fragments of 1280 bytes
Else the sender sends the packet (???)

Proposal
Document "UDP over IPv6"
in "Path MTU Discovery for IP version 6", RFC 1981?