Long Fat Pipes: TCP WSCALE, TCP SACK and Time Stamp Options
October 14th, 2013
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Long Fat Pipes
High-capacity packet satellite channels are LFN’s (Delay 4 x 35‘800 km = 470ms RTT) and modern terrestrial long-haul fibre-optic paths will also fall into the LFN class. There are three fundamental performance problems with the current TCP over LFNs:
• Window Size Limit (2^16 or max 65k bytes) – Remedy: TCP option “Window scale”
• Recovery from Segment Losses – Remedy: TCP option “selective acknowledgement”
• Round-Trip Measurement – Remedy: TCP option “Time stamp” Read more…