IPv6-05 Stateless DHCP

[@mattwilson1669]

Keith, thank you for the series on IPv6. It has greatly enhanced my knowledge of this subject. I have recreated all your configs on my Cisco 1841s and it all works as you describe. Cheers.

[@parheliaa]

Your Ipv6 playlist is simply amazing :)

[@KeithBarker]

Thank you Rafał

[@partimeap]

Thanks Keith. Your videos are really helping me understand IPV6!

[@danielschiffers9696]

Thanks Keith, this playlist is amazing! Did you expect we would still be using IPv4 in 2021 when you made these video's in 2011? I am curious about your answer.

[@KeithBarker]

Yes, the mac addresses are identical too. :)

[@KeithBarker]

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.

[@KeithBarker]

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.

[@AndersJackson]

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).

[@LocNguyen-cf8wd]

Hi Keith, @8:50 Please help to explain how to verify that the device, PC or Linux, has received the DNS information? I don't understand why the PC can ping the Linux show that the DNS works well. I built a lab that I use a PC to receive the DHCP information. I use the command "ipconfig", but I can't see the DNS information that I have configured on the router. Is there anyway to find the DNS information? Please help me out. Loc

[@ytramyornoc]

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!

[@ytramyornoc]

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

[@rahul28851]

Is there any way to contact such a genius. If so please let me know.

[@eypen90]

Keith, did you use "ipv6 local pool mypool 2001:db8:21/64 64" command? i'm a bit confuse, how did hosts autoconfigured into 2001:db8:21:333::/64 network?

[@KeithBarker]

For the IPv6, in the RA you will want to set the M bit to a 1. Here is a great post on that topic: blogDOTioshintsDOTinfo/2012/01/ipv6-nd-managed-config-flag-is-just.html

[@eypen90]

@Keith6783 ok, i'm starting to understand. But why does my clients doesn't get the dns-server ip? and i'm using ipv6 unicast-routing, should i erase it?(refer to websites)

[@samiemic]

Hi Keith, am running an actual DHCP server and I want my hosts to auto configure with IPv6 addresses from RAs and be assigned IPv4 addresses from the server (Dual Stack) Can you point me in the right direction to accomplish this task? Thank you.

[@refaiabdeen2142]

Awesome Bro !!!

[@EverWin420]

excellent explaination thx :D

[@minoorouhi465]

Hi Keith. What service is running on the linux box to get the DNS information? and where is it stored?

[@KeithBarker]

I had a router acting as a DHCP server handing out the DNS information. The Ubunto desktop was just acting as a DHCP client.

[@minoorouhi465]

Thank you for the reply. But I wanted to figure out what dhcp client program you used there? maybe wide? and how does one get to see the DNS info on the Ubuntu machine?

[@AndersJackson]

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.

[@eypen90]

@Keith6783 Ok got it, it take a while to get the dns address. Thanks by the way, your videos helps my network project.