Mecanismos de transicion pv6


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Mecanismos de transicion pv6

  1. 1. Transitions Mechanism IPv6 to IPv4 12/09/2012 1 Edgardo Scrimaglia CCIE
  2. 2. Objetives • Describe transition mechanisms used by IPv6 network traffic to transit IPv4 networks. • Describe how IPv6-over-IPv4 encapsulation (tunneling) works. • Describe how NAT-PT works. • Explain how to express IPv4 addresses in IPv6 format. 12/09/2012 2
  3. 3. Transition IPv4-to-IPv6 Transition richness means: • No fixed day to convert; no need to convert all at once. • Different transition mechanisms are available: – Smooth integration of IPv4 and IPv6 – Use of dual stack or 6-to-4 tunnels • Different compatibility mechanisms: – IPv4 and IPv6 nodes can communicate 12/09/2012 3
  4. 4.  Dual stack is an integration method where a node has “implementation and connectivity” to both an IPv4 and IPv6 network. Dual Stack 12/09/2012 4
  5. 5. Example Cisco IOS Dual Stack • If both IPv4 and IPv6 are configured on an interface, this interface is dual-stacked. 12/09/2012 5
  6. 6. Tunneling  Tunneling is an integration method where an IPv6 packet is encapsulated within another protocol, such as IPv4. This method of encapsulation is IPv4 protocol 41 (Excluding Teredo): This includes a 20-byte IPv4 header with no options and an IPv6 header and payload. This is considered dual stacking. 12/09/2012 6
  7. 7. “Isolated” Dual-Stack Host  Encapsulation can be done by edge routers between hosts or between a host and a router. 12/09/2012 7
  8. 8. Configuring an IPv6 Tunnel • Configured tunnels require: – Dual-stack endpoints – IPv4 and IPv6 addresses configured at each end 12/09/2012 8
  9. 9. Example: Cisco IOS Tunnel Configuration 6in4 Tunnel 12/09/2012 9
  10. 10. Configuring static routes for 6-to-4 tunnels A 6-to-4 tunnel establishes a transient link between IPv6 domains which are connected by an IPv4 backbone • Create a tunnel interface • Set tunnel mode with the tunnel mode ipv6ip 6to4 command • Create an IPv6 specific address • Set the source interface for the tunnel • Configure an Ipv6 static route 12/09/2012 10
  11. 11. Converting IPv4 addresses to IPv6 for 6-to-4 Tunnel • A 6-4 tunnel uses special addresses in the 2002::/16 address space • The first 16 bits are the hexadecimal number 2002 • The next 32 bits are the original source address in hexadecimal form • The IPv4 address of is converted into AC10:0C01 • The complete address would be 2002:AC10:0c01:1::1/64 12/09/2012 11
  12. 12. Example: Cisco IOS Tunnel Configuration 6-to-4 between R1 y R3 R1 R2 R3 Lo0 Lo0 Lo0 /24 S0/0/0 S0/0/0 /24 S0/0/1 /24 /24 S0/0/1 R1 R1(config-if)# interface tunnel 0 R1(config-if)# tunnel mode 1pv6ip to 6to4 R1(config-if)# ipv6 address 2002:AC10:0C01:1::1/64 R1(config-if)# tunnel source s0/0/0 Exit R1(config)# ipv6 route 2002::/16 tunnel 0 Verification R1#ping 2002:AC10:1703:1::3 R1#ping 2002:AC10:1703:1::100 Host IPV6 (remote) R3 R3(config-if)# interface tunnel 0 R3(config-if)# tunnel mode 1pv6ip to 6to4 R3(config-if)# ipv6 address 2002:AC10:1703:1::3/64 R3(config-if)# tunnel source s0/0/1 Exit R3(config)# ipv6 route 2002::/16 tunnel 0 Verification R3#ping 2002:AC10:0c01:1::1 R3#ping 2002:AC10:0c01:1::100 Host IPV6 (remote) 12/09/2012 12 IPV6 Net 2001:A:C:1::/64 IPV6 Host 2001:A:C:1::100 IPV6 Net 2001:A:B:1::/64 IPV6 Host 2001:A:B:1::100
  13. 13. Cisco IOS Software Is IPv6-Ready: 6-to-4 Tunneling • 6-to-4: – Is an automatic tunnel method – Gives a prefix to the attached IPv6 network 12/09/2012 13
  14. 14.  NAT-Protocol Translation (NAT-PT) is a translation mechanism that sits between an IPv6 network and an IPv4 network.  The job of the translator is to translate IPv6 packets into IPv4 packets and vice versa. Translation – NAT-PT 12/09/2012 14
  15. 15. Self Check 1. What are the 2 most common techniques to transition from IPv4 to IPv6? 2. How does a dual-stack node choose which stack to use for a particular traffic flow? 3. How is a router interface “dual-stacked”? 4. What is tunneling? 5. What is the job of the translator in a NAT-PT topology? 12/09/2012 15
  16. 16. Resumen • The two most common techniques to transition from IPv4 to IPv6 are dual stack and IPv6-to-IPv4 (6-to-4) tunnels. • Tunneling IPv6 traffic over an IPv4 network requires one edge router to encapsulate the IPv6 packet inside an IPv4 packet and another router to de-encapsulate it. • Transition methods from IPv4 to IPv6 include dual-stack operation, protocol translation, and 6-to-4 tunnels. 12/09/2012 16
  17. 17. Q & A!! 12/09/2012 17
  18. 18. Resources • Tunneling IPv6 through an IPv4 Network (Configuration Example) – 186a00800b49a5.shtml • Implementing Tunneling for IPv6 – on_guide_chapter09186a00801d6604.html • Cisco IOS IPv6 Configuration Library – on_guide_book09186a00801d65f9.html • Network Address Translator-Protocol Translator Technical Notes – ff51.html 12/09/2012 18