The routers get involved in this and they know that on the path between this router and that router a certain percentage of the bandwidth is reserved to these things and a certain percentage of it is allowed on a first come first served basis.

His obituary was written by Vint Cerf and publiJon Posteld as RFC 2468 in remembrance of Postel and his work. He is known principally for being the Editor of the Request for Comment (RFC) document series and for administering the Internet Assigned Numbers Authority (IANA) until his death.