On Mar 5, 2013, at 12:43, t.p. <daedulus@xxxxxxxxxxxxx> wrote: > but I am positing that for most > of the IETF, congestion control is a solved topic and little expertise > is needed I have seen too many WGs trying to build "lightweight" UDP-based application protocols that do not correctly back off under loss to agree with you here. It's solved IFF a standard transport like TCP is used. Not otherwise. (And even when TCP is used, questions like "how many parallel connections" remain.) Lars