Port Mapping Alternative solution Tom Van Caenegem Port Mapping - PowerPoint PPT Presentation

Oct 14, 2022 •162 likes •205 views

Port Mapping Alternative solution Tom Van Caenegem Port Mapping Alternative Cross-symmetric muxing w/o port mapping message exchange Principle: RTP Rx RTP receive port for unicast RTP session = RTP Rx RTCP transmit port in SSM RTP session

Port Mapping Alternative solution Tom Van Caenegem
Port Mapping Alternative Cross-symmetric muxing w/o port mapping message exchange Principle: RTP Rx RTP receive port for unicast RTP session = RTP Rx RTCP transmit port in SSM RTP session Same IP address RTP Rx NAPT RS (unicast RTP session) FT (SSM RTP session) FT announced P4 as RTCP RTCP (RR, NACK, RAMS-R) (no cookie) Receive port P3 P4 P3^ RTP / RTCP (SR,RAMS-I)* RS announced P4 as RTP source port P4 in unicast RTP P3 P3^ session RTCP (RR, RAMS-T) P2 RS announced P2 P3 Px^ as RTCP Receive. port with P2<> P4 * RTP & RTCP muxed on single port
Port Mapping Alternative Cross-symmetric muxing w/o port mapping message exchange What it brings :   No delay because of port mapping message/cookie exchange Requires no RTP keep alive  • RTCP FB from RTP Rx primes/refreshes NAPT port state Expressed concerns:  Is not aligned with (classical) RTP/RTCP architectures  • Two RTCP components of two different sessions share same transport address, be it in two different directions Solution does not always work when 2 or more RTP receivers behind same  NAPT choose the same C-NAME and the same SSRC • In this case, the RS/FT cannot associate the RTCP messages transmitted by the RTP receivers in the unicast sessions with the right receiver when NAPT has an “address and port dependent” behaviour (RFC 4787) Way forward:  Specify solution for use only with appropriate NAT behaviour  Specify solution in combination with receiver-generated cookie (where cookie  must be truly randomly generated, and exchanged with every client-generated RTCP message) Abandon this solution   others?

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