IPv6

IPv6 - Quick Notes
- 128 bit address
    - repeating 0's are abbreviated
      fd59:8f91:f52d::1:0:0:1 ->
           fd59:8f91:f52d:0000:0001:0000:0000:0001
- Loopback - ::1/128
- Link-local - fe80::/10 - can communicate with other machines on same switch
     - could end up with interfaces that have the same address
     - resolved using scope id
- Scope ID
     - only non-global IP's
     - only valid on same machine -- don't put on wire.
     - postfixed with %
         - e.g. http://[fe80::1:2%2]:80/index.html
                for interface "2"
- Site-local - fec0::/10
     - (like 192.168.0.0/16)
     - not officially usable - use unique-local instead
     - Useful for lab
- unique-local - fc00::/8, fd00::/8
     - fc00::/8 - from allocation authoritiy
     - fd00::/8 - randomly assigned via rfc4193
     - block these numbers - do not route
- Global - 2000::/3
     - All publicly accessible IP's
     - No NAT
- Tunnel IPV6 over IPV4
     - 6to4 requires endpoint have public IP
          - 2002::/16
     - Teredo - encapsulate ipv6 packet in IPv4 UDP
          - 2001::/16
- IPv4 Mapped - ::ffff/96
     - ::ffff:10.67.12.12
     - Dual stack (have both)
     - security! - will firewall rules apply?  tunneling will bypass firewall?