플로우 레이블(Flow Label ; 20비트) 필드
- 네트워크 상에서 패킷들의 어떤 특정한 흐름에 대한 특성을 나타내는 필드
- 기본적으로 0으로 되어 있고, 음성이나 화상 등의 실시간 데이터의 트래픽을 나타내기 위해 0이 아닌 값으로 설정

RFC 2460에 보시면 내용이 나와있고요. (Chapter 6 : P25)
http://www.csl.sony.co.jp/cgi-bin/hyperrfc?rfc2460

It is hoped that those experiments will eventually lead to agreement
   on what sorts of traffic classifications are most useful for IP
   packets.  Detailed definitions of the syntax and semantics of all or
   some of the IPv6 Traffic Class bits, whether experimental or intended
   for eventual standardization, are to be provided in separate
   documents.

   The following general requirements apply to the Traffic Class field:

      o  The service interface to the IPv6 service within a node must
         provide a means for an upper-layer protocol to supply the value
         of the Traffic Class bits in packets originated by that upper-
         layer protocol.  The default value must be zero for all 8 bits.

      o  Nodes that support a specific (experimental or eventual
         standard) use of some or all of the Traffic Class bits are
         permitted to change the value of those bits in packets that
         they originate, forward, or receive, as required for that
         specific use.  Nodes should ignore and leave unchanged any bits
         of the Traffic Class field for which they do not support a
         specific use.

      o  An upper-layer protocol must not assume that the value of the
         Traffic Class bits in a received packet are the same as the
         value sent by the packet's source.

또한 IEEE 802.16 에 보면 나와있습니다, 아래 원문을 참조하세요.

http://grouper.ieee.org/groups/802/16/tgd/contrib/C80216d-03_14.pdf

좋은하루 되세요..


>안녕하세요!!
>IPv6 헤더에 보면 flow label 필드가 있는데요..
>뭐 QoS를 위한 필드라고는 하는데...
>좀 자세한 정보를 알고 싶거든요..
>
>flow label에 관한 정보나 자료가 있으시면 알려주시면 감사하겠습니다.
>
>부탁드릴께요..