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We've had a very few requests for the PuTTY suite to make use of the IP type-of-service (ToS) field - apparently it does make a practical difference to a few people using traffic shapers to sort interactive/bulk traffic.
Some thought needs to be given to this: PuTTY terminal sessions are obviously `interactive' traffic, PSCP/PSFTP are `bulk', but Plink could be either depending on usage, as could random port-forwardings. Also, we may not want to leak that sort of information about an encrypted connection. So it would probably need to be configurable, and off by default.
Useful references: MS KB Q196358 and Q248611 (which indicates that on Win2K, a registry entry needs to be set to allow user programs to set the ToS).
This probably can't be set on Windows <2000.
Need to make sure we understand how one is supposed to use this field in today's world; I've a feeling that several sets of semantics may have come and gone over the years.