Window Scaling Option

• Long Fat Pipe Networks (LFN): Satellite links

• Need very large window sizes.

• Normally, Max window = 216 = 64 KBytes

• Window scale: Window = W × 2Scale

Kind = 3

Length = 3

Scale

• Max window = 216 × 2255

• Option sent only in SYN and SYN + Ack segments.

• RFC 1323

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