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IPv6 Fragmentation
By the source host only, not by routers along the packet's path!
- No “Don't Fragment” bit anymore
- Minimum MTU = 1280 bytes
- If a packet size > MTU, the packet is dropped, ICMPv6 is sent
How to choose a packet's size:
- Always fragment to 1280 bytes (1232 bytes of payload)
- Use PMTUD, store MTU value in Destination Cache (DC)
- Applications can access IPv6 layer using API (Berkley sockets, e.g: see RFC3542)
More information is available on the
graphics version.