Re: [tram] [Tsv-art] Tsvart last call review of draft-ietf-tram-turnbis-25

["Konda, Tirumaleswar Reddy" <[e-mail]>]

Hi Joe,

Please see inline

From: Joe Touch <[e-mail]>
Sent: Wednesday, June 19, 2019 8:13 PM
To: Konda, Tirumaleswar Reddy <[e-mail]>
Cc: Magnus Westerlund <[e-mail]>; [e-mail]; Brandon Williams <[e-mail]>; [e-mail]; [e-mail]; [e-mail]
Subject: Re: [Tsv-art] [tram] Tsvart last call review of draft-ietf-tram-turnbis-25


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On Jun 19, 2019, at 7:30 AM, Konda, Tirumaleswar Reddy <[e-mail]<mailto:[e-mail]>> wrote:

Hi Joe,

I have added the following line to address your other comment:

Note that the server does not perform per-packet translation for TCP-to-UDP relaying and vice-versa. For TCP-to-UDP relaying from client to peer, the TURN server sets the DF field in the outgoing UDP packet based on the presence of DONT-FRAGMENT attribute in the TURN message. For UDP-to-TCP relaying from peer to client, the TURN server sets IP header fields in the TCP packets on a per-connection basis for the TCP connection.

Which parameters? Based on what?

[TR] It is already discussed in section 15.

<snip>

   Differentiated Services Code Point (DSCP) field [RFC2474<https://tools.ietf.org/html/rfc2474>]

      Preferred Behavior: Set the outgoing value to the incoming value,
      unless the server includes a differentiated services classifier
      and marker [RFC2474<https://tools.ietf.org/html/rfc2474>].  Note, the TCP connection can only use a
      single DSCP code point so inter flow differentiation is not
      possible, see Section 5.1 of [RFC7657]<https://tools.ietf.org/html/rfc7657#section-5.1>.


   Fragmentation



      Preferred Behavior: Any fragmented packets are reassembled in the

      server and then forwarded to the client over the TCP connection.

      ICMP messages resulting from the UDP datagrams sent to the peer

      MUST be forwarded to the client using TURN's mechanism for

      relevant ICMP types and codes.


   IPv4 Options

      Preferred Behavior: The outgoing packet is sent without any IPv4
      options.

</snip>

-Tiru

In addition, a mere note does not undo the implication of indicating each IP parameter (option, DF) separately as if there are always configurable per-TURN message.

Joe