Sorry for the long post, but I've hopefully presented all pertinent information.
I have a Cisco 800 (877) with an ADSL connection (interface Dialer0). All my LAN devices are on a single interface, Vlan1. I have recently been added to an IPv6 trial by my ISP, Zen Internet (UK-based). I'm running OIS 12.4(24).T4.
I have a *reasonable* understanding of IPv4, but IPv6 is all very new to me.
This is the exact wording in the email from my ISP:
Thank you for your email. Your subscriber account has now been enabled for IPv6. Your IPv6 address details are:
ND Prefix: 2a02:8011:d000:21::/64
PD Prefix: 2a02:8010:6036::/48
The two prefixes are described below, along with some further information on the Zen IPv6 service:
/64 Neighbour Discovery (ND) Prefix. This is used to automatically address the WAN interface of your Router, or if you are directly connected without a router, the WAN interface of that device.
/48 Delegation Prefix. This is usually provided over DHCPv6, and requires that your router acts as a requesting router for the purpose of IPv6 delegation RFC3633 - (https://tools.ietf.org/html/rfc3633). Subnets of this prefix are used by the CPE to address devices on the LAN. If prefix delegation is not supported on the router, a suggested interface ID and static route is available, which should allow routing to take place.
We also have an IPv6 enabled DNS Resolver (2a02:8010:1::212:23:3:100) , the IPv6 Address of this will be automatically advertised to supporting routers RFC3646 (https://tools.ietf.org/html/rfc3646). It can also be configured manually if required.
I have configured IPv6 on my router as follows:
ipv6 unicast-routing ipv6 cef ipv6 dhcp pool NODE-DHCPV6 dns-server 2A02:8010:6036:0:4CCB:4CB:E7AF:4D34 < What I believe to be the correct IP for my Windows server on the LAN domain-name HOME.local
In other words, I've followed the above guides blindly, and I'm not necessarily doing the right thing :-)
Everything *seems* to be working correctly. I can ping internal and external IPv6 addresses, I can get results back from a ping -6 www.google.co.uk (on Windows), and I get 19/20 from http://ipv6-test.com/ (the missing one being a rDNS entry, which I will contact my ISP about).
Here is my doubt/concern. I have some VMs in the house, hosting some websites, antivirus server, mail server etc. I want to guarantee that the IPv6 addresses assigned to these hosts will never change, so that I can add AAAA DNS entries. To ensure that addresses don't change, for IPv4 I would normally use DHCP on my Windows server for this, but I understand that a local DHCP server for IPv6 should rarely be required.
As I understand it, using the eui-64 method of address generation should assign an IPv6 address based on the MAC, but that doesn't seem to be happening. As such, I'm worried that the address might change in the future, for whatever reason.
Listen: https://smarturl.it/CCRS9E25 Follow us: twitter.com/ciscochampions
With applications and users everywhere, the networks are now, more than ever, being tasked with delivering consistent protection while providing an exceptional user exper...
Listen: https://smarturl.it/CCRS9E24 Follow us: https://twitter.com/CiscoChampion
Cisco Radio Aware Routing addresses several of the challenges faced when merging IP routing and radio communications in mobile networks, especially those exhibiti...
Listen: https://smarturl.it/CCRS9E23 Follow us: https://twitter.com/CiscoChampion The Wi-Fi 6E Catalyst 9136 access point takes advantage of the 6-GHz band to produce a network that is more reliable and secure, with higher throughput, more ...
When moving from OSPFv2 to OSPFv3, there are many changes in the format of the LSAs Type, but the most known changes are: IP prefix informations are no longer carried in Type-1 LSA and Type-2 LSA, new LSAs Type 8 and 9 are added to carry these prefixes.