<div dir="ltr">In your example the IPv4 prefix would be 192.168.1 assuming it is a /24 subnet. <div><br></div><div style>In the world of IPv6, just like in IPv4, an address is made up of the prefix and host parts, so for you example 192.168.1 is the prefix and 1 is the host, of course IPv6 addresses are Hex and longer, not decimal. In most setups in IPv6 the host part of the address is determined by the devices MAC address plus a couple extra bits in the middle, and there are multiple prefixes assigned by the router/network, as well as a 'local' prefix. In the end you will often have 3-4 IPv6 addresses per device in this sort of multi homing setup, all with the same host portion but different prefix portions. The router can then broadcast if a certain prefix is no longer in use, or if a new prefix is to be added.</div>
<div style><br></div><div style>This is just based on my simplistic understanding of it, and its been a while since ive read up on IPv6 so if im wrong some one feel free to correct me :P</div><div style><br></div><div style>
I do need to do more reading, as I have clients with 5+ sites connected via MPLS WAN, with 2 of the sites with internet connections from different providers, and the sites without internet use their wan to route to a site with internet, and if the site goes down it fails over to the other site with internet. Not sure how to tackle that in IPv6, NAT on IPv4 meant i didnt have to think about a lot of this :P</div>
<div style><br></div><div style>--Damian</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Mar 5, 2013 at 10:23 AM, Don Gould <span dir="ltr"><<a href="mailto:don@bowenvale.co.nz" target="_blank">don@bowenvale.co.nz</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">On 5/03/2013 12:02 p.m., Mark Andrews wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
The single router solution for IPv6 works today. You connect to<br>
two ISPs. You send RA's for both prefixes. If one upstream goes<br>
down you deprecate those prefixes. When the link is restored you<br>
stop deprecating those prefixes. The hosts pick the source address<br>
of the active prefix for new outgoing connections. In terms of<br>
availability this is no different than using NAT with IPv4.<br>
</blockquote>
<br></div>
Ok cool. I'd love to see some scripts for the Mikrotik Router OS showing how you set it up to do that.<br>
<br>
I don't understand what impact that has on the devices.<br>
<br>
I don't fully understand this concept of prefixes. 192.168.1.1 where's the prefix in that? 192?<br>
<br>
Currently I think in terms of a single address per device. Are you saying all my devices get two addresses and then just use one?<br>
<br>
I don't understand how the devices know which is the least cost route.<div class="im"><br>
<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Alternatively you can have one prefix and establish the VPN link<br>
exactly like you did with IPv4 to re-establish connectivity.<br>
<br>
</blockquote></div>
Yip, which now requires me to understand how to route v6 over vpn. Clearly I need to make a list of all the skills I didn't know I needed just to have enough learning to replace my v4 functionality. I wonder what else I don't know that I don't know I need to know?<div class="im">
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
The IETF is looking at making the top solution work with multiple<br>
routers. Yes, source + destination based routing is coming to a<br>
net near you.<br>
</blockquote></div>
What?<br>
<br>
D<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Mark<br>
</blockquote><div class="im HOEnZb">
<br>
<br>
-- <br>
Don Gould<br>
31 Acheson Ave<br>
Mairehau<br>
Christchurch, New Zealand<br>
Ph: <a href="tel:%2B%2064%203%20348%207235" value="+6433487235" target="_blank">+ 64 3 348 7235</a><br>
Mobile: <a href="tel:%2B%2064%2021%20114%200699" value="+64211140699" target="_blank">+ 64 21 114 0699</a><br>
<br></div><div class="HOEnZb"><div class="h5">
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