Obtaining IPv6 Addressing
/48 Standard Prefix
- 2001:ABCD:4321:1234::/64
- 2600:ABCD:4321::/48
- Standard block size for more than 1 subnet
- 65,536 networks available
- 2600:ABCS:4321:(VLAN0)::/64
- 2600:ABCD:4321:(Site:VLAN)
- 2600:ABCD:4321:(Entity ID from spreadsheet)
Host IDs
- Can be static or dynamic
- Dynamic can be stateful or stateless
- With DHCP, there is a process where someone requests and someone offers.
- SLAAC (Stateless Address Auto Configuration)
- Instead of doing DHCP which is stateful, we can do stateless.
- 64 bits available
- It is unlikely that you will have duplicate IPS
- In case of that you will detect it with DAP (Duplicate Auto Discovery)
- Stateless is very simple, just figure out what IP addresses on the gateway.
- Randomized values can be difficult to track
- Static IPs or reservations are useful for servers
- AAAA records replace A records
- A: www -> IPv4
- AAAA: www -> IPv6
- Dynamic DNS
- Reporting your IP address to a central server to register.
DHCPv6
- Similar to DHCPv4
- Stateful database is maintained
- Stateful mechanism
- Database maintained and logging.
- Excellent for logging
- Supports reservations
- Make a device get the same IP every time it logs in because we see the same user.
- Handy for doing things like an ACL
- Support additional options
- DHCP options
- IP, GW, DNS, TFTP, WPAD...
DHCPv6 Options