RFC 1323. When it is not activated the TCP receive window is limited to a maximum of 64K.
Logically, you only need TCP1323Opts if you are using RWIN values higher than 65535, but then it is essential!
There are four possible settings:
| · | Disable TCP1323Opts
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| · | Window scaling only (recommended setting)
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| · | Timestamp only
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| · | Window scaling and timestamp
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About the settings:
Enabling both window scaling and timestamp can help in some cases if you are experiencing increased packet loss. However, performance is generally better with window scaling only as the timestamp option adds 12 bytes to each packet header. Turning off window scaling is not recommended.