Things You Need to Know about IPv6:
Issues with IPv4
- Addressing
- Size of Internet Routing Tables
- Lack of true end-to-end model
IPv6 Features
- 128 bit Address space
- Elimination of NAT
- Improved Router Efficiency
- Broadcast Elimination
- Transition Richness
- Mobile IP
- Improved Security
IPv6 Address Types:
- Unicast
- Global Unicast Address
- Link Local Address
- Multicast
- Anycast
IPv6 Routing
- Static routes
- RIPng
- OSPFv3
- IPv6 EIGRP
IPv6 Route Redistribution
- RIPng
- Redistribution between different RIPng processes
- Redistribution between RIPng and other routing protocols
- OSPF
- Redistribution between different OSPF processes
- Redistribution between OSPF and other routing protocols
BGP
- Redistribution between IGP’s and BGP
IPv6 Transition Techniques
- Dual Stack Techniques
- IPv4 and IPv6 coexist in the same devices and networks
Tunneling Techniques:
- Manual IPv6 tunnels
- Simulates a permanent IPv6 link between two IPv6 domains over an IPv4 backbone
- Tunnel Mode ipv6ip
- GRE IPv6 Tunnels
- Simulates a permanent IPv6 link between two IPv6 domains over an IPv4 backbone similar to manual
- Transport Mechanism is GRE
- It is the default tunneling protocol on Cisco routers
- Automatic 6to4 Tunnels
- Point to Multipoint vs. Point to Point
- IPv4 addresses are embedded in the IPv6 addresses and are used to find the other tunnel endpoints
- 2002::/16 is reserved for these
- Border Routers must be dual-stacked
- Limited to Static or BGP+4 routing
- ISATAP Tunnels
- Allows IPv6 only devices to communicate with IPv4-only devices
- Very similar to other automatic methods, but designed for traffic within a site
- Uses unicast IPv6 addresses that included a 64 bit prefix and an interface identifier
- Interface ID created in modified EUI-64 format
- Uses OUI 00–00-5E-FF in the high order 32 bits of interface ID and the IPv4 tunnel destination add encoded in the low order 32 bits
- IPv6 64-bit unicast prefix can be any unicast prefix
NAT-PT
- Translates an IPv6 address to an IPv4 Address
- Also translates an IPv4 address to an IPv6 address
Make Sure You Can Configure:
- IPv6 globally and on an interface
- IPv6 routing protocol
- IPv6 Tunnels
- IPv6 Route Redistribution
Make sure you are familiar with output:
- sh ipv6 route
- sh ipv6 interface
- sh ipv6 ospf neigh
- sh ipv6 eigrp neighbor
Please support our Sponsors here :