dhcpv6 => relay, encapsulated vendor options discarded

[Benoit Panizzon]

Hello World

After struggling with the ISC DHCP Server Version 4.2.4-P2 for a while, using 
it in a DOCSIS Cable Network environment we had one of our developer look at 
the isc code to find out why the needed suboptions (4419 containing 1026) are 
always empty.

In a Cable Network the Flow of Events is as follows:

Customer CPE (receiving RA with 'statefull' flag)
Customer CPE (sending DHCPv6-Solicit Message
           |
           v
Customer Modem (Adding Encapsulated Vendor Option containing some information 
needed to correctly provision that modem)
           |
           v
CMTS (DHCP Relay, Encapsulating the while package in a DHCPv6 Forward Relay 
message)
           |
           v
ISC DHCP Server (Reading the encapsulated message and extracting only the 
original DHCPv6 Solicit Message sent from the client. Discaring the viso 
suboptions added by the Customer Modem).

- Is this a known Bug?
- Is this somehow intended behaviour?
- Is there a fix or patch for the issue?

And something I should probably not ask on this list?

- Does anyone know another DHCPv6 Server which gives access to those options?

Regards

Benoit Panizzon
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