[c-nsp] IPv6 xDSL deployments and DHCP-PD

[n00dles at nix-jutsu.net]

Hello all,

I've been working on the DSL deployment for my company for some time,
and have hit snag. let me elaborate on how things are done thus far.

We have user accounts auth'd via Radius the attributes sent to our LNS
provide prefix information enough to number the ptp over PPP. The LNS is 
then configured as DHCP server to dish out DNS and also requests DHCP-PD
prefix stored within Radius. This is all passed onto the CPE and works
fine, bar one issue.

We have no way to maintain consistant routing information across client
disconnects, due to DHCP lease times. Thus if a client disconnects we
lose PD routes and its not until the clients lease expires does it jump
start the DHCP process in order to re-install routes.

I've experimented with lowering lease times, and adding per-user statics
as part of the Radius/LNS dialog but as you can guess this is not
efficient. 

Have I totally missed something somewhere? Currently it seems to me that
the DHCP implentation needs some why of being tied to connection state
such that if the line drops upon re-auth the CPE will make a DHCP
request. 

Ta

-- 
Chris Nicholls
<Insert Nerd/Engineer/IT professional sig here>