IPv6 helps in that it mandates a MTU of at least 1280 bytes. In addition, in IPv6 only source nodes can break a packet into fragments - intermediary nodes such

IPv6 helps in that it mandates a MTU of at least 1280 bytes. In addition, in IPv6 only source nodes can break a packet into fragments - intermediary nodes such as firewalls and routers cannot. Sending back a ICMPv6 Packet Too Big for packets larger than the MTU is a must, which helps with path MTU discovery.