Traversal Using Relays around NAT (TURN) Extension for IPv6
draft-ietf-behave-turn-ipv6-11

From Ari Keranen's review:

1. Introduction

    symmetric NATs that wish to be on the receiving end of a connection
    to a single peer.

Would help to have a reference to definition of symmetric NATs and 
perhaps rather use the more up-to-date terminology of RFC4787 (endpoint 
dependent filtering/mapping).


3. Overview of Operation

    Assuming the request is authenticated, the TURN server allocates a
    transport address of the type indicated in the REQUESTED-ADDRESS-
    FAMILY attribute.  This address is called the allocated transport
    address.

Could make sense to use the same terminology as TURN RFC: "Relayed 
Transport Address" instead of "allocated transport address". Same issue 
throughout the draft.


4.2. Receiving an Allocate Request

    If the server can successfully process the request, it allocates a
    transport address to the TURN client, called the allocated transport
    address, and returns it in the response to the Allocate Request.

s/to the TURN client/for the TURN client/ ?
(same issue a bit later in the section)


    As specified in [I-D.ietf-behave-turn], the Allocate Response
    contains the same transaction ID contained in the Allocate Request
    and the XOR-RELAYED-ADDRESS attribute that sets it to the allocated
    transport address.

The part "that sets it to the [...]" sounds a bit strange. Is there a 
word missing?


5.1. Sending a Refresh Request

    To perform a binding refresh, the client generates a Refresh Request
    as described in Section 7.1 of [I-D.ietf-behave-turn].

Should this say "allocation refresh" instead of "binding refresh"?

Section 8., paragraph 4:
>    The descriptions below have two parts: a preferred behavior and an
>    alternate behavior.  The server SHOULD implement the preferred
>    behavior.  However, if that is not possible for a particular field,
>    then the server SHOULD implement the alternative behavior.

  This would be better phrased as "SHOULD do preferred, MUST do
  alternative otherwise, MUST NOT do anything else."

My earlier COMMENT had a typo - for correctness (although my on-line dictionary says "alternate" is usable as well as "alternative" in American usage in this case), s/Alternate behavior:/Alternative behavior/ throughout.