ipv6: logging option docsis.cm-mac-address (4491 / 17 / 1026)
benoit.panizzon at imp.ch
Fri Nov 23 15:46:38 UTC 2012
> Just a thought, to me it looks like you are deploying IPv6 the same way
> as IPv4? One address at a time to each costumer.
> I believe the idea is that each customer gets a prefix/64 and will
> assign IPs from that as needed.
We use all scenarios in our lab.
- Non-Temporary Addresses
- Temporary Addresses
If a customer connects a Windows 7 client to his modem, Windows 7 does not
request a prefix, but just one address.
If a customer connects one of the very few existing IPv6 aware CPE routers to
his modem, it will hopefully correctly request a prefix. (works that way with
If a customer connects a unix box with ISC dhcp Client to his modem and does a
-N -N -T -T -T -P -P -P -P then he will request two non-temp, three temp and
four prefixes :-)
The modem 'intercepts' the DHCP6 solicit message from the client connected
behind the modem and adds vendor specific information (option 17) enterprise
ID from CableLabs (ID 4491), and among other suboption 1026 which contains the
Cmac Address of that cable modem. Those Cmac Addresses are registered at the
CMTS and our provisioning system known which customer got which Cmac address.
(Traffic shaping and telephony is also done on the modem). So this is the
element identifying the customer.
> In that case you will need to keep track of the prefixes as any host
> using that prefix must belong to that customer? Would this satisfy the
> legal requirements?
Sure, if I find a way of logging Suboption 1026 which is also added to prefix
requests I'm fine :-)
> Using a 6over4 tunnel today, I get a prefix/64 and it is my task to
> build any address using that prefix the way it pleases me, even if I may
> have 100s of hosts.
We don't operate mass-tunnels. We want to deploy native ipv6 to the broadband
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