Download IPv6

IPv6
Extending the IP protocol
towards the future.
Andrew Zorowitz
4/26/05
Why IPv6?




Running out of IPv4 Addresses
Random assignment of IPv4
Addresses
IPv4 designed for a much less robust
global network.
Designed with security and QoS in
mind.
Address Pool Sizes

IPv4 supports 232 addresses
• That’s approximately 4 billion IP
addresses

IPv6 supports 2128 addresses
• That’s approximately 3.4 * 1038
addresses
Why not yet?



Lack, until recently, of IPv6 routing
protocols.
Cost of equipment upgrades.
NAT and DHCP have extended useful
lifetime of IPv4, but the value of both
of those is quickly ending.
Addressing Format
IPv6 addresses are shown in the format:
1343:4326:34D3:0000:0000:3BC3:2354:0054/48
or
1343:4326:34D3::3BC3:2354:54/48
IPv6 Address Types



Unicast
Multicast
Anycast
Functions



Neighbor Discovery
Router Discovery
Stateless Autoconfiguration
• Duplicate Address Detection

Path MTU Discovery
• No fragmentation
IPv6 Routing

Routing Protocols
• RIPng
• OSPFv3
• IS-IS Extensions for IPv6
• MP-BGP
• EIGRP for IPv6
• Static Routing
Differences Between IPv4
and IPv6 Routing



Interface based as opposed to
network based.
Uses link-local addresses for
identifying machines
Not enabled by default on Cisco
routers
• Enabled with the command: ipv6
unicast-routing
Transition Mechanisms



Dual Stack Backbones
IPv6 over IPv4 Tunneling
IPv6 over Dedicated Data Links
For More Information


http://www.cisco.com/en/US/product
s/sw/iosswrel/ps5187/products_confi
guration_guide_chapter09186a0080
1d65f5.html#wp1154533
Try it out! The CCIE pods (CCNA
pods 1-8) and some of our other
pods support IPv6!