IPv6-05 Stateless DHCP





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Published on Sep 23, 2011

5th in the series of IPv6 videos, DHCP being used to hand out DNS information.

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Comments • 21

Taher Sadeghi
Good video. You are going a little too fast in going through text commands.
Refai Abdeen
Awesome Bro !!!
Anders Jackson
You should also probably use ip(8) instead of ifconfig(8), route(8) and arp(8).  It is modern and easier to use, and the other three are actually obsoleted.
Anders Jackson
You can actually send the DNS information with SLAAC by following RFC-5006.  In Debian based distributions, just install package rdnssd, and it is fixed (you already have package resolvconf insalled).
Minoo Rouhi
Hi Keith. What service is running on the linux box to get the DNS information? and where is it stored?
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Keith Barker
Yes, the mac addresses are identical too. :) 
Thank you for the quick reply! So I'm assuming the mac addresses are the same for Fa0/0 and Fa0/1 on R3 (0000.3333.3333)??Thanks for explaining the concept... I do understand but I also believe it causes a little confusion when we use identical mac addresses... Thanks again Keith!
Keith Barker
A layer 2 MAC address has to be unique, right? Only unique for a VLAN. We can use the same MAC address on multiple interfaces as long as they are connected to different VLANs. Same concept for link local addresses. They have to be unique in the same VLAN. If a router has 3 interfaces, it can use the same link local addresses on each interface, because they are each connected to different VLANs. 
Greetings once again Mr. Barker and thank you for all that you do! @4:55 the debug ipv6 on R3 shows a RA from (link-local) FE80::200:33FF:FE33:3333 to FF02::1 on FastEthernet 0/1... then @5:11 we see another RA from the "same link-local address" to FF02::1 on FastEthernet 0/0... I thought a link-local address was only allowed per each segment. I guess I'm a little confused and curious... just what are the mac-addresses of Fa0/0 and F0/1 on R3 ?? Am I missing something??... Thanx Keith 
Keith Barker
The PING to IP address, only was verifying IPv6 connectivity. To see the DNS server information, use the command "ip config /all". That is one way to see it on a Windows machine. 
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