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6over4
6over4 is an IPv6 transition mechanism meant to transmit IPv6 packets between dual-stack nodes on top of a multicast-enabled IPv4 network. IPv4 is used as a virtual data link layer (''virtual Ethernet'') on which IPv6 can be run. How 6over4 works 6over4 defines a trivial method for generating a link-local IPv6 address from an IPv4 address, and a mechanism to perform Neighbor Discovery on top of IPv4. Link-local address generation Any host wishing to participate in 6over4 over a given IPv4 network can set up a virtual IPv6 network interface. The link-local address is determined as follows : * it starts with fe80:0000:0000:0000:0000:0000, or fe80:: for short, * the lower-order 32 bits to the binary value must be that of the IPv4 address of the host. For example, host 192.0.2.142 would use fe80:0000:0000:0000:0000:0000:c000:028e as its link-local IPv6 address (192.0.2.142 is c000028e in hexadecimal notation). A shortened notation would be fe80::c000:028e. Multicast Address Ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ISATAP
ISATAP (Intra-Site Automatic Tunnel Addressing Protocol) is an IPv6 transition mechanism meant to transmit IPv6 packets between dual-stack nodes on top of an IPv4 network. It is defined in the informational RFC 5214. Unlike 6over4 (an older similar protocol using IPv4 multicast), ISATAP uses IPv4 as a virtual nonbroadcast multiple-access network (NBMA) data link layer, so that it does not require the underlying IPv4 network infrastructure to support multicast. How ISATAP works ISATAP defines a method for generating a link-local IPv6 address from an IPv4 address, and a mechanism to perform Neighbor Discovery on top of IPv4. Link-local address generation Any host wishing to participate in ISATAP over a given IPv4 network can set up a virtual IPv6 network interface. The link-local address is determined by prepending fe80 ::0200:5efe:… for globally unique addresses, or fe80::0000:5efe:… for private addresses, in front of the 32 bits of the host's IPv4 address. For example, th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |