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

[Joe Touch <[e-mail]>]

That fragmentation text is fine; the text on IPv4 and IPv6 fragmentation that appears earlier in Sec 15 is the issue.

Can you just drop that earlier text?

Joe

> On Jun 19, 2019, at 7:48 AM, Konda, Tirumaleswar Reddy <[e-mail]> wrote:
> 
> Hi Joe,
>  
> Please see inline
>  
> From: Joe Touch <[e-mail] <mailto:[e-mail]>> 
> Sent: Wednesday, June 19, 2019 8:13 PM
> To: Konda, Tirumaleswar Reddy <[e-mail] <mailto:[e-mail]>>
> Cc: Magnus Westerlund <[e-mail] <mailto:[e-mail]>>; [e-mail] <mailto:[e-mail]>; Brandon Williams <[e-mail] <mailto:[e-mail]>>; [e-mail] <mailto:[e-mail]>; [e-mail] <mailto:[e-mail]>; [e-mail] <mailto:[e-mail]>
> Subject: Re: [Tsv-art] [tram] Tsvart last call review of draft-ietf-tram-turnbis-25
>  
> CAUTION: External email. Do not click links or open attachments unless you recognize the sender and know the content is safe.
> 
> That text remains insufficient, e.g.:
> 
> 
> 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
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