?
for help
space-bar
Generally ISPs
assign only one IPv4 address per endpoint.
Typically your router owns this world-wide unique IP address.
But every devices in you local network needs its own IP.
How does this work?
16 Bytes = 2 128
340.282.366.920.938.000.000.000.000.000.000.000.000 nodes
read as: '340 sextillions'
2001:085b:1f1f:0000:0000:0000:00a9:1234
2001:85b:1f1f::a9:1234
2607:f238:0000:0000:0000:0000:0000:0000 | | | | | | | | | | | | | +– /112 | | | | | | | | | | | +– /96 | | | | | | | | | +– /80 | | | | | | | +– /64 | | | | | +– /48 | | | +– /32 | +– /16
Routing prefix (/48 or more; ISP typically /32)
Subnet (/16 or less)
Interface-identifier (at least /64;
this allows Stateless autoconfiguration)
Multiple IPs per device!
nslookup -query=aaaa www.google.com
dig www.google.com AAAA
fe80::7686:7aff:fe71:1e25b%eth0
Dual-Stack: IPv4 and IPv6 at the same time
DS-Lite: IPv4 NAT done by ISP.
Euphemism: carrier-grade NAT
Tunneling mechanism (6⇆6):
6in4, 6to4, 6over4, ISATAP, Teredo, ...
Translation mechanism (6⇆4): NAT64
Sparse: Cable Providers
with small IPv4 pools like Unity (DS-lite),
or big players like 1&1 and Telekom (Dual-Stack)