Fredrik Holmberg

Network Consultant  

Tag: ccnp

IPv6 Autoconfiguration with SLAAC and NDP, how does it work?

Unlike the prehistoric IPv4 protocol which relies on DHCP servers to be able to communicate and do anything useful, the modern IPv6 protocol is much more self-sufficient and in tune with 2012.

Introducing IPv6 Stateless Address Autoconfiguration or SLAAC. Described in RFC 4862 SLAAC is a mechanism that:

“requires no manual configuration of hosts, minimal (if any) configuration of routers, and no additional servers. The stateless mechanism allows a host to generate its own addresses using a combination of locally available information and information advertised by routers”

In Apple terms; it’s like magic!

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Configuring Single-Area OSPFv3

Configuring OSPFv3 is not very different from configuring OSPF for IPv4. It’s actually simpler and much cooler since it’s running on IPv6.

Either prepare a topology using GNSparser or use this one:


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Dynamic Multipoint IPv6 tunnels using 6to4

6to4 is a transition mechanism that allows modern IPv6 sites to communicate over a legacy IPv4 network, like The Internet. Just like other auto-tunneling techniques the IPv6 end-to-end connectivity is made possible by encapsulating the IPv6 datagrams inside IPv4 datagrams.

Auto-tunneling is a last resort method compared to dual-stack or native IPv6 support, but it can be used as a temporary solution for providing IPv6 connectivity. Just don’t expect kick-ass performance

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Frame Relay switching and point-to-point subinterfaces

Having browsed through half the Internet without finding any decent documentation on how to do this, I gave up on Google and put together something myself. Hopefully it can be useful for other networking students.

I’m doing a lab for Cisco CCNP ROUTE where you’re supposed to set up OSPF over a Frame Relay (NBMA) hub-and-spoke topology with a headquarter and two remote sites. All subinterfaces must be configured as point-to-point. This is how you configure the Frame Relay part.

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