Common types
2000::/3 global unicast
fc00::/7 unique local
fe80::/10 link-local
ff00::/8 multicast
::1/128 loopback
IPv6 Cheat Sheet
Notation, compression, prefix math, address types, configuration, and verification.
Compression rules
- Write eight hextets when fully expanded.
- Remove leading zeros inside each hextet.
- Replace one longest consecutive run of zero hextets with
::. - Never use
::more than once. - Never remove trailing significant zeros.
Prefix anchors
/48 common site allocation boundary
/64 standard LAN prefix
/128 one specific address
One hextet = 16 bits
One hex digit = 4 bits
No IPv6 broadcast
IPv6 uses multicast and Neighbor Discovery.
ff02::1 all nodes
ff02::2 all routers
Link-local addresses are required for important local control functions.
Cisco verification
show ipv6 interface brief show ipv6 interface gi0/0 show ipv6 route show ipv6 neighbors ping ipv6 2001:db8:20::10
Score 0/0Streak 0