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==== Jumbogram Segmentation Offload ==== The device SHOULD support IPv4 and IPv6 jumbogram SO packets that exceed the 64 KB maximum IP packet size. IPv6 headers have a 16-bit payload length field, so the largest possible standard IPv6 packet is 64 KB + IPv6 header (payload length includes IPv6 extension headers, if any). IPv4 headers have a 16bit total length field, so the largest possible IPv4 packet is slightly smaller: 64KB including header. Jumbogram segmentation offload ignores the IPv6 payload length and IPv4 total length fields if zero. The host must then communicate the real length of the entire packet to the device out-of-band of the packet, likely as a descriptor field. RFC 2675 defines an IPv6 jumbo payload option, with which IPv6 packets can support up to 4GB of payload. This configuration sets the payload length field to zero and appends a hop-by-hop next header with jumbo payload option. Unlike for IPv6 jumbograms that are sent as jumbograms on the wire, it is NOT necessary for IPv6 jumbo segmentation offload to include this jumbo payload hop-by-hop next header, as the segments themselves will not be jumbograms. <span id="receive-segment-coalescing"></span>
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