rfc2516.txt

RFC规范的翻译稿

      该TAG用来传送厂商自定义的信息。TAG_VALUE的头4个字节包含了厂商的识别码 ，其余字节尚未定义。厂商识别码的高字节为0，低3个字节为网络字节序的厂商的SMI网络管理专用企业码，如“定义值RFC”（参考文献[4]）中定义的那样。
      不推荐使用该TAG。为了确保互操作性，实现可以悄悄的忽略Vendor-Specific TAG。
   0x0110 Relay-Session-Id
      该TAG可由中继流量的中间代理加入到Discovery数据包中。TAG_VALUE对主机和访问集中器都是晦涩难懂的（paque）。如果主机或访问集中器收到该TAG，则它们必须在所有的Discovery数据包中包含该TAG以作为响应。所有的PADI数据包必须保证足够空间来加入TAG_VALUE长度为12字节的Relay-Session-Id标签。
      如果Discovery数据包中已经包含一个Relay-Session-Id标签，则不允许再加入该标签。这种情况下，中间代理应该使用该现有的Relay-Session-Id标签。如果它不能使用现有的标签，或者没有足够空间来增加一个Relay- Session-Id标签,那么它应该向发送者返回一个Generic-Error标签。
   0x0201 Service-Name-Error
      该TAG(典型的有一个长度为零的数据部分)表明了由于某种原因，没有理睬所请求的Service-Name。如果有数据部分,并且数据部分的头一个字节非0，那么它必须是一个      可打印的UTF-8字符串，解释请求被拒绝的原因。该字符串可以不以NULL结束。
   0x0202 AC-System-Error
      该TAG表明了访问集中器在处理主机请求时出现了某个错误。(例如没有足够资源来创建一个虚拟电路。PADS数据包中可以包含该标签。
      如果有数据，并且数据的第一个字节不为0，那么（数据）必须是一个可打印的UTF-8 字符串，该字符串解释了错误的性质。该字符串可以不以NULL结束。
   0x0203 Generic-Error
      该TAG表明发生了一个错误。当发生一个不可恢复的错误并且没有其它合适的TAG时，它可被加到PADO, PADR或PADS数据包中。如果出现数据部分，那么数据必须是一个UTF-8字符串，解释错误的性质。该字符串不允许以NULL结束。
附录B
   下面是数据包的几个例子：
   PADI数据包:

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1
                                     0xffffffff
                 0xffff
                Host_mac_addr
                                  Host_mac_addr (续)
               ETHER_TYPE = 0x8863
  v = 1
   t = 1
      CODE = 0x09
               SESSION_ID = 0x0000
                  LENGTH = 0x0004
               TAG_TYPE = 0x0101
                TAG_LENGTH = 0x0000

   PADO数据包:

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                                Host_mac_addr
Host_mac_addr（续）
               Access_Concentrator_mac_addr
                               Access_Concentrator_mac_addr (续)
                ETHER_TYPE = 0x8863
 v = 1
  t = 1
     CODE = 0x07
                SESSION_ID = 0x0000
                 LENGTH = 0x0020
                TAG_TYPE = 0x0101
               TAG_LENGTH = 0x0000
            0x47
       0x6f
        0x20
         0x52
            0x65
       0x64
        0x42
         0x61
            0x63  
       0x6b
        0x20
         0x2d
            0x20
       0x65
        0x73
         0x68
            0x73
       0x68
        0x65
         0x73
            0x68
       0x6f
        0x6f
         0x74  


   PPP LCP数据包:显示了PPP protocol的值(0xc021)，但是PPP的净载数据留给读者。这是一个从主机发给访问集中器的数据包。
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                              Access_Concentrator_mac_addr  
    Access_Concentrator_mac_addr(c)
         Host_mac_addr
                                    Host_mac_addr (cont)
                ETHER_TYPE = 0x8864
  v = 1
  t = 1
        CODE = 0x00
           SESSION_ID = 0x1234
           LENGTH = 0x????
                  PPP PROTOCOL = 0xc021
             PPP payload  . . . . . .

作者地址
   Louis Mamakos
   UUNET Technologies, Inc.
   3060 Williams Drive
   Fairfax, VA  22031-4648
   United States of America
   EMail: [e-mail]

   Kurt Lidl
   UUNET Technologies, Inc.
   3060 Williams Drive
   Fairfax, VA  22031-4648
   United States of America
   EMail: [e-mail]

   Jeff Evarts
   UUNET Technologies, Inc.
   3060 Williams Drive
   Fairfax, VA  22031-4648
   United States of America
   EMail: [e-mail]

   David Carrel
   RedBack Networks, Inc.
   1389 Moffett Park Drive
   Sunnyvale, CA  94089-1134
   United States of America
   EMail: [e-mail]

   Dan Simone
   RedBack Networks, Inc.
   1389 Moffett Park Drive
   Sunnyvale, CA  94089-1134
   United States of America
   EMail:[e-mail]

   Ross Wheeler
   RouterWare, Inc.
   3961 MacArthur Blvd., Suite 212
   Newport Beach, CA  92660
   United States of America
   EMail: [e-mail]
完整的版权通告
   Copyright (C) The Internet Society (1999).  All Rights Reserved.

   This document and translations of it may be copied and furnished to
   others, and derivative works that comment on or otherwise explain it
   or assist in its implementation may be prepared, copied, published
   and distributed, in whole or in part, without restriction of any
   kind, provided that the above copyright notice and this paragraph are
   included on all such copies and derivative works.  However, this
   document itself may not be modified in any way, such as by removing
   the copyright notice or references to the Internet Society or other
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   followed, or as required to translate it into languages other than
   English.

   The limited permissions granted above are perpetual and will not be
   revoked by the Internet Society or its successors or assigns.

   This document and the information contained herein is provided on an
   "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
   TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
   BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
   HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

RFC2516  A Method for Transmitting PPP Over Ethernet (PPPoE)

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