IPv6 Overview Address space Address types IPv6 and Tunneling

IPv6 Overview Why Ipv6? Major changes Fix address space limitations Add improvements Major changes Address space size Address notation Simplified header Use of extension headers

IPv6 Address Space 128 bits expressed in eight groups of 4 hexidecimal characters Example address: 2001:0db8:0000:0000:0000:0000:1428:57ab

Notation Variations If one or more four-digit group(s) is 0000, the zeros may be omitted and replaced with two colons(::). Following this rule, any number of consecutive 0000 groups may be reduced to two colons, as long as there is only one double colon used in an address. Example- 2001:0db8:0000:0000:0000:0000:1428:57ab 2001:0db8::1428:57ab

Notation Variations It is also acceptable to just replace a string of 4 zeroes with a single zero Example- 2001:0db8:0000:0000:0000:0000:1428:57ab 2001:0db8:0:0:0:0:1428:57ab

Address Types No broadcast! Loopback - ::1 Multicast – starts with 11111111 Anycast – one to nearest Link local (fe8 to feb) – similar to AIPA Unique local – similar to 10.0.0.0, 172.16-31.0.0, 192.168.0.0 Global unicast

Configuring a Host Stateless address autoconfiguration IPv6 hosts can be configured to automatically send an ICMPv6 router discovery message when they first connect to a network. This message is called a link-local multicast router solicitation request. If configured suitably, routers respond to such a request with a router advertisement packet that contains the network address and other network-layer configuration parameters. Stateless autoconfiguration is only suitable for hosts: routers must be configured manually or by other means.

Configuring a Host Stateful Configuration (DHCP) If IPv6 autoconfiguration is not suitable, a host can use stateful configuration (DHCPv6) A host can be configured manually. Type in entire address EUI-64 Interface ID Configure prefix only; MAC address plus 16 bits used for host portion.

Tunneling/Dual Stack Tunneling Dual stack Teredo - Allows peers to establish an IPv6 tunnel through a NAT device 6 over 4 Dual stack