[j-nsp] Anybody have an SRX working with Comcast DHCP v4 and v6?

[Jonathan Call]

Comcast uses stateful DHCPv6 where it delegates a Identity Association (the /128 for your external interface) and a Prefix Delegation which can be used on your internal network. Comcast will allocate a PD of up to a /60 which could give you up to 16 /64 site level aggregation (SLAs).

Right now I can o all of this on FreeBSD using a third party package (KAME DHCPv6).  I belive the SRX can support it based on this KB:

http://kb.juniper.net/InfoCenter/index?page=content&id=KB30509&actp=search

Let me know how it goes.

Jonathan

________________________________
From: juniper-nsp <juniper-nsp-bounces at puck.nether.net> on behalf of Chris Adams <cma at cmadams.net>
Sent: Saturday, July 2, 2016 8:15 AM
To: juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] Anybody have an SRX working with Comcast DHCP v4 and v6?

Once upon a time, Aaron Dewell <aaron.dewell at gmail.com> said:
> I attempted to make this work on an SRX210 running 12.1X46-D30 with TWC.  The inherent issue was that Junos will only accept multiples of 16 bit-boundaries as a dhcpv6 client, and /56 (as TWC assigns) is not accepted.
>
> So it's less about your settings and more about the known PR, assuming that Comcast is delegating a /56 as TWC does.

For residential, I think the largest Comcast assigns by PD is /60.
However, it is up to you to set the request size; DHCPv6 has a field for
that (IIRC by default you only get a /64 from Comcast).

I see (on OpenWRT, not JUNOS) a /128 assigned to the WAN interface and a
DHCPv6 PD /60, which OpenWRT then carves up for the local networks.

--
Chris Adams <cma at cmadams.net>
_______________________________________________
juniper-nsp mailing list juniper-nsp at puck.nether.net
https://puck.nether.net/mailman/listinfo/juniper-nsp