AST-IPng-004 1 Host-based IPv6 Multicast Addresses Allocation draft-park-host-based-mcast-01.txt Jung-Soo Park, Myung-Ki Shin, Yong-Jin Kim ETRI 52nd IETF.

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AST-IPng Host-based IPv6 Multicast Addresses Allocation draft-park-host-based-mcast-01.txt Jung-Soo Park, Myung-Ki Shin, Yong-Jin Kim ETRI 52nd IETF – Salt Lake City

AST-IPng What is this about An extension to the multicast addressing architecture of IPv6 Each host (interface) uses Interface ID to allocate it’s own multicast addresses without any server Especially useful in Zeroconf environment

AST-IPng Background Multicast addressing architecture of IPv6 –Does not contain any built-in support for dynamic address allocation FFgroup IDflgs 8-bit4-bit112-bit scop 4-bit

AST-IPng Unicast prefix-based M. A. (by Brian Haberman & Dave Thaler) Multicast address format –P flag is used to indicate a multicast address that is assigned based on the network prefix –plen indicates the actual number of bits in the network prefix field that identify the subnet group ID00PT 8 bits flags 32 bits 4 bits scope reserved 8 bits plen 8 bits network prefix 64 bits

AST-IPng Host-based multicast address (I) Link-local multicast address format –flgs field should use the same flags defined in section 3 of unicast prefix-based method – –interface ID field is used to distinguish each host and is derived from unicast address group IDflgs 8-bit4-bit64-bit scop 4-bit Interface ID 32-bit reserved 16-bit

AST-IPng Host-based multicast address (II) Site-local multicast address format – –SLA value is obtained from the network prefix contained in the RA message to distinguish a site group IDflgs 8-bit4-bit64-bit scop 4-bit Interface ID 32-bit SLA 16-bit

AST-IPng Discussion & Proposal Distinction between host-based and unicast prefix-based M. A. is required –Because the flgs field use the same flags defined in section 3 of unicast prefix-based draft –The value of scope field can be used For scope <= 5, host-based MA For scope > 5, unicast prefix-based MA Modifications in unicast prefix-based draft ? IPv6 WG draft