IPv6 headers, neighbor solicitation, router advt (Part 3)
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The document discusses how to find the global unicast IPv6 address and router MAC address from a router advertisement message. It explains that the router advertisement contains ICMPv6 options, including the global unicast prefix. To get the global address, take the node's link-local address from its neighbor solicitation, and replace the link-local prefix with the global prefix from the router advertisement. The source link layer address field in the router advertisement contains the MAC address of the advertising router.
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the above ppt will provide info about ip addresses in a more practical way covering all the below mentioned topics
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- 1. IPv6 headers, Neighbor solicitation, and Router Advt (Part 3) By: Indraneel Pole
- 2. Router Advert • Router advt is the message sent by router to all the nodes in the network. • This week we are going to talk about some of the ICMPv6 option fields of Router advt.
- 3. Finding the global unicast IPv6 address • Q1. So the node sent a solicitation request (similar to the one we talked in part 2), and then recieves a advt from router. How to find the global unicast address for the node from it? • Q2. What if you are asked to find the MAC address of router that is sending advt?
- 4. • As you might remember from part 2, in solicitation request, node includes its link local unicast address calculated using MAC address and EUI-64 format (inverting the 7th bit and adding ff:fe in between the MAC address, along with fe80::/64 prefix. If you don‘t know, read RFC 2460) • Now have a look at router advt snippet from Wireshark Finding the global unicast IPv6 address
- 5. • Here you can see the prefix information in one of the ICMPv6 option, which is actually the global unicast prefix from the router. Replace fe80::/64 with this header in your address from solicitation(link local address), and you get global unicast address for the node. • Also have a look at source link layer address and what RFC has to say about it. This gives you the MAC address of router.
- 6. End of Part 3 • ICMPv6 options in router advt contains a lot of information. • If you can‘t directly find global unicast addresses from the Wireshark captures. Just build one using global prefix.