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M2M Cellular Gateway
The diagram above depicts the IPv6 addressing through PPPoE, PPPoEv6 server (DSLAM) on the ISP
side provides IPv6 configuration upon receiving PPPoEv6 client request. When PPPoEv6 server gets
client request and successfully authenticates it, the server sends IP address, DNS server addresses and
other required parameters to automatically configure the client.
6to4
6to4 is one mechanism to establish automatic IPv6 in IPv4 tunnels and to enable complete IPv6
sites communication. The only thing a 6to4 user needs is a global IPv4 address.
6to4 may be used by an individual host, or by a local IPv6 network. When used by a host, it must
have a global IPv4 address connected, and the host is responsible for encapsulation of outgoing IPv6
packets and decapsulation of incoming 6to4 packets. If the host is configured to forward packets for
other clients, often a local network, it is then a router.
In above diagram, the 6to4 means no need to set gateway address "automatic" tunneling solution.
The automatic mean have relay server, as defined in RFC 3068 has included segments draw
192.88.99.0/24 used as 6to4 relay of anycast address to complete 6in4 setting.
6in4
6in4 is an Internet transition mechanism for Internet IPv4 to IPv6 migration. 6in4 uses tunneling to
encapsulate IPv6 traffic over explicitly‐configured IPv4 links. As defined in RFC 4213, the 6in4 traffic is
sent over the IPv4 Internet inside IPv4 packets whose IP headers have the IP protocol number set to 41.
This protocol number is specifically designated for IPv6 encapsulation.
Index skipping is used to reserve slots for new function insertion, when required.
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