Network+ : IPv6

  1. Network+ Certification
  2. Network+ : Introductions and Resources
  3. Network+ : Network Models
  4. Network+: Cabling
  5. Network+ : Topologies
  6. Network+ : Ethernet Basics
  7. Network+ : Contemporary Ethernet
  8. Network+ : Installing a Physical Network
  9. Network+ : Booting and Getting On the Network
  10. Network+ : TCP/IP Basics
  11. Network+ : Subnetting
  12. Network+: Routing Protocols
  13. Network+ : Routing and Firewalls
  14. Network+ : TCP/IP Ports and Applications
  15. Network+ : Network Naming and Sharing Resources
  16. Network+ : Secure Networking
  17. Network+ : Advanced Networking Devices
  18. Network+ : IPv6
  19. Network+ : Remote Connectivity
  20. Network+ : WiFi
  21. Network+ : Virtualization
  22. Network+ : Mobile Networking
  23. Network+ : Building a Real-World Network
  24. Network+ : Managing Risk
  25. Network+ : Protecting Your Network
  26. Network+ : Network Monitoring
  27. Network+ : Network Troubleshooting

Unit 18

Chapter 12

IPv6 Basics and Address Notation

IPv6 addresses are 128 bits long

Link Local Addresses

Strictly for LAN communication.

Replaces MAC address for local addressing!

Neighbor Discovery Protocol replaces arp.

‘How To “arp -a” In IPv6’
https://www.practicalcodeuse.com/how-to-arp-a-in-ipv6

https://oswalt.dev/2011/10/neighbor-solicitation-ipv6s-replacement-for-arp/

IPv6 ‘arp’ For Windows:

netsh int ipv6 show neigh

IPv6 ‘arp’ For Linux:

ip -6 neigh

 

Link Local addresses always start with:

fe80:0000:0000:0000

The second half is the Host ID, eg.:

0001:0002:0003:0004

The full Link Local address is like:

fe80:0000:0000:0000:0001:0002:0003:0004

External IPv6 Addresses

The first half is the Network Number, given by the nearest router upon boot.

They start with a number in the 2000s:

2004:1234:5678:90ab

The second half is the Host ID:

0001:0002:0003:0004

The full address is like:

2004:1234:5678:90ab:0001:0002:0003:0004

Address Shortening Rules

1. Leading zeros can be dropped, eg. :0223: becomes :223:

2. Continuous groups of four zeros can be abbreviated as :: , eg. :0000:0000:0000: becomes ::

3. But you can only use that abbreviation once.

4. All CIDRs are /64

5. IPv6 loopback is ::1

Multicast

No more broadcast in IPv6. You can multicast to all nodes (think all computers) at

ff02::1

or all routers at

ff02::2

This is the address our NIC cries out to, to find a router and join an IPv6 network.

Anycast

There’s not much like it in IPv4. In IPv6, it allows several systems scattered over large distances to share the same address. Thus anyone anywhere can ask for that address, and automatically connect to the nearest system. Think of Google or Youtube: you just need the closest server, not any particular server.

RIRs

DHCP

DNS

Tunneling

4to6

6in4

Teredo, Miredo

ISATAP