[AusNOG] IPv6 Prefix Delegations from Aussie BB - Private or Routeable?

[David Rawling]

Much appreciated, James, especially considering it's a public holiday
weekend. I have sent what I trust is the right detail privately.

Dave.
-- 
David Rawling - Principal Consultant
PD Consulting and Security

t: +61 41 213 5513 | e: djr at pdconsec.net

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On Fri, 2025-04-25 at 06:36 +0000, James Di Trapani wrote:
> Hi David,
> 
> The response from the support team isn't entirely correct, PDs should
> be entirely routable. Can you shoot me your service ID & PD range
> off-list.
> 
> Cheers,
> 
> James Di Trapani
> Senior Manager Network Backbone & IP Edge 
> 
> Aussie Broadband Limited
> 
> T: +61431003217
> E: james.ditrapani at team.aussiebroadband.com.au
> 
> 
> aussiebroadband.com.au
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> From: AusNOG <ausnog-bounces at lists.ausnog.net> on behalf of David
> Rawling <djr at pdconsec.net>
> Sent: Friday, April 25, 2025 3:51:08 PM
> To: ausnog at lists.ausnog.net <ausnog at lists.ausnog.net>
> Subject: [AusNOG] IPv6 Prefix Delegations from Aussie BB - Private or
> Routeable? 
> Hi all
> 
> Seeking some advice from people who do this kind of thing all the
> time.
> 
> I have an IPv6 prefix (::/48) delegated from the ISP (Aussie BB) and
> for about the last two years that PD has been routed and accessible
> from the raw unfiltered Internet. Shows up on the portal etc. It's
> been configured mostly static, as I didn't have time to try to figure
> out PD.
> 
> A few days ago that subnet stopped working completely. It's still
> delegated, and the router can even hand out the delegated addresses,
> but nothing routes. I've now had multiple responses from the support
> team claiming that
> 
> > IPv6 /48 subnets in IA-PD address's are only usable for LAN. The
> IPv6 /64
> > subnet is the only one that can be used outside of a LAN scope.
> 
> The subnet being delegated seems to be a regulation IPv6 subnet -
> it's part of the 2403:5800::/28 delegated to Aussie Broadband by
> APNIC.
> 
> Am I missing something obvious here? Shouldn't a PD normally be
> routed (why would I bother getting a PD from the ISP if it's not
> routable space - I'd just use something from fd00::)? Are ABB really
> enforcing NAT/NPT on a protocol designed not to need it any more?
> It's still delegated to my nameservers for reverse resolution, which
> I think wouldn't be needed if it wasn't routable in the first place.
> And the corresponding IPv4 routed subnet is fine.
> 
> Does anyone else have a PD from Aussie Broadband, obviously on a
> business plan of some sort is preferred, where the PD subnets are
> routable? Alternatively - am I just being dumb? I could be dumb, it's
> a day ending in a Y...
> 
> For reference it's a simple architecture where the PD should be
> usable on the LAN side of the router, but isn't:
> 
> ABB <---> IPv6 DHCP --[ROUTER]-- IPv6 PD <---> [FW]
> 
> Dave.
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