[ppsp] comments for gu-ppsp-tracker-protocol and gu-ppsp-peer-protocol

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Comments for draft-gu-ppsp-tracker-protocol-04.
1.
Section 6
 "To protect signaling from impersonation attackers, who pretend to be
   another peer rather than their authentic identities, certificates
   along with TLS/DTLS could be used to ensure that each message is sent
   from an authorized participant (tracker or peer) of the P2P streaming
   system."

HTTP is based on TCP. I think only TLS is applicable.


2.
The example of peer list is not given.


Comments for draft-gu-ppsp-peer-protocol-02.

1.
Is it better to add <DestPeerID> in messages?


2.
"3.1.  Protocol Architecture

   The proposed PPSP Peer Protocol uses a newly defined, light weight
   gossip protocol between the peers to exchange the actual information,
   but uses the RELOAD [I-D.ietf-p2psip-base] protocol to establish the
   connections between peers and to locate other peers with which to
   establish gossip protocol connections."

Tracker protocol draft and peer protocol draft should consider 
not-implementing-NAT-traversal instead of RELOAD as default.
Implementing and using RELOAD is not neccesary if there is no NAT or the 
ratio of NATed peer is very low. 
RELOAD is not the only way to establish connection to NATed peers. 
Otherthan RELOAD, there is another way (PPSP-ICE), which is proposed in my 
NAT traversal draft. 
Using RELOAD or PPSP-ICE brings more work to implementing a P2P streaming 
system.


BR
Lichun


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