RFC 4884:Extended ICMP to Support Multi-Part Messa...
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1280 octet

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4. ICMP Extensibility
... ICMP message to exceed the minimum IPv6 MTU (i.e., 1280 octets). Unfortunately, the "original datagram ...


5. Backwards Compatibility
... reassembly buffer size (576 octets for ICMPv4 or 1280 octets for ICMPv6), there is no upper limit upon the length of the "original datagram ...

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