Tech/Protocols/IPv6

IPv6 Addressing and how to use it

IPv6 Addresses consist of the characters 1,2,3,4,5,6,7,8,9,a,b,c,d,e,f where the case of the letters does not matter. Blocks are separated by colons ':' and in many tools are isolated with brackets '[]'. Each address consists of 128bits.

2001:0db8:85a3:0000:0000:8a2e:0370:7334

or

2001:db8:85a3:0:0:8a2e:370:7334

or

2001:db8:85a3::8a2e:370:7334

or in an URL

http://[2001:db8:85a3::8a2e:370:7334]

or a DNS AAAA

hostname.example.com. IN AAAA 2001:db8:85a3::8a2e:370:7334

or a DNS PTR record

4.3.3.7.0.7.3.0.e.2.a.8.0.0.0.0.0.0.0.0.3.a.5.8.8.b.d.0.1.0.0.2.ip6.arpa.  IN  PTR   hostname.example.com.

or Localhost

::1

IPv6 Routing and how it works

IPv6 uses a simplified header system that does not recalculate hashes at every router. The MTU of a path from end to end is determined before transmit to enable communication without fragmented packets. Combined with network allocations on standard boundaries makes for a faster transport across the wire.