Now non-negotiable feature does not has a fix size, it's length is
decide by the value of the non-negotiable feature. For example, the
client send Sequence Window Feature as the following: 0x23 0x04 0x03
0x64, the Sequence Window Feature has the length of 1-byte only.
But RFC4340 said:
7.5.2. Sequence Window Feature
Sequence Window has feature number 3 and is non-negotiable. It
takes 48-bit (6-byte) integer values, like DCCP sequence numbers.
Change and Confirm options for Sequence Window are therefore 9 bytes long.
Is this correct? Or there are some RFCs said the non-negotiable feature
has variable length?
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