Junos OS

Hi,

I am testing the allocation of IPv6Prefix's to PPP Subscribers. I am in a position, now, where I can allocate an IPv6 Prefix to subscribers and IPv6 to IPv6 on the Internet is working well with Dual Stack. However, I do have one issue that I really need to resolve, and that is as follows:

On the RADIUS I am using Framed-IPv6-Prefix VSA and allocating a /64 via this VSA, and the CPE receives this allocation and also supplies the internal LAN with /64 address prefix's. But, this is not quite how it should be. I need to allocate a /56 to the WAN interface and then /64 Prefix's to LAN interfaces. Here is what I have configured so far:

RADIUS: Framed-IPv6-Prefix : 1a16:c640:2600:4446::/64

LNS Configuration:

set access address-assignment pool IAPD-PPPOA-POOL family inet6 prefix 1a16:c640:26::/48
set access address-assignment pool IAPD-PPPOA-POOL family inet6 range IAPD-RANGE prefix-length 56

set system services dhcp-local-server dhcpv6 overrides delegated-pool IAPD-PPPOA-POOL
set system services dhcp-local-server dhcpv6 group PD interface si-1/0/0.0

The problem is that our range needs to be a /29 and not a /48, but I cannot get it to work correctly. I have tried many different options and it just will not operate correctly. This /48 seems to be the only way I can get it to work. This is no good for different subscribers.

Does anyone know the best method of approach to get this working correctly please?

Would the following configuration work for my requirements:

set dynamic-profiles dyn-lns-profile protocols router-advertisement interface "$junos-interface-name" prefix $junos-ipv6-ndra-prefix
set access address-assignment neighbor-discovery-router-advertisement NDRA
set access address-assignment pool NDRA family inet6 prefix 1a16:c640::/29
set access address-assignment pool NDRA family inet6 range LNS low 1a16:c640:26::/64
set access address-assignment pool NDRA family inet6 range LNS high 1a16:c640:ffff:ffff:ffff::/64

Thanks

Maybe if I re-word the question I could get an easier answer 🙂

If I have "Framed-IPv6-Prefix" VSA configured on my RADIUS Server to assign the IPv6 Prefix to the subscriber, why would I need a pool on the LNS? This seems counter intuitive.....

I have the configuration on the RADIUS and have removed all pool requirements from the LNS and yet, I get no assignment of IPv6 to the CPE. If I look at subscribers on the LNS I see that the LNS has the correct IPv6 details for the subscriber but it is obviously not forwarding that on. 

Can someone explain why a pool is required if the RADIUS is meant to be assigning the IPv6?

I will leave this for now as it's more important to get other things tested first.