RFC 3146 (rfc3146) - Page 2 of 8

Transmission of IPv6 Packets over IEEE 1394 Networks

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RFC 3146          IPv6 Packets over IEEE 1394 Networks      October 2001


3. IPv6-CAPABLE NODES

   An IPv6-capable node MUST fulfill the following minimum requirements:

   -  it MUST implement configuration ROM in the general format
      specified by ISO/IEC 13213:1994 and MUST implement the bus
      information block specified by IEEE Std 1394a-2000 [1394a] and a
      unit directory specified by this document;

   -  the max_rec field in its bus information block MUST be at least 8;
      this indicates an ability to accept block write requests and
      asynchronous stream packets with data payload of 512 octets.  The
      same ability MUST also apply to read requests; that is, the node
      MUST be able to transmit a block response packet with a data
      payload of 512 octets;

   -  it MUST be isochronous resource manager capable, as specified by
      IEEE Std 1394a-2000;

   -  it MUST support both reception and transmission of asynchronous
      streams as specified by IEEE Std 1394a-2000.

4. LINK ENCAPSULATION AND FRAGMENTATION

   The encapsulation and fragmentation mechanism MUST be the same as "4.
   LINK ENCAPSULATION AND FRAGMENTATION" of [IP1394].

      Note: Since there is an ether_type field to discriminate protocols
      and MCAP (multicast channel allocation protocol) is used for both
      IPv4 and IPv6, the version field in GASP (global asynchronous
      stream packet) header of IPv6 datagrams is the same value (one) as
      [IP1394].

   The ether_type value for IPv6 is 0x86dd.

   The default MTU size for IPv6 packets on an IEEE1394 network is 1500
   octets.  This size may be reduced by a Router Advertisement [DISC]
   containing an MTU option which specifies a smaller MTU, or by manual
   configuration of each node.  If a Router Advertisement received on an
   IEEE1394 interface has an MTU option specifying an MTU larger than
   1500, or larger than a manually configured value, that MTU option may
   be logged to system management but MUST be otherwise ignored.  The
   mechanism to extend MTU size between particular two nodes is for
   further study.







Fujisawa & Onoe             Standards Track
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