Generalized UDP Source Port for DHCP Relay
RFC 8357

Received changes through RFC Editor sync (created alias RFC 8357, changed abstract to 'This document defines an extension to the DHCP protocols that allows a relay agent to use any available source port for upstream communications.  The extension also allows inclusion of a DHCP option that can be used to statelessly route responses back to the appropriate source port on downstream communications.', changed standardization level to Proposed Standard, changed state to RFC, added RFC published event at 2018-03-06, changed IESG state to RFC Published)