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[rpd] [Community-Discuss] inputs on IPv4 Inter-RIR policy proposals (off-topic)

Tue Jul 2 13:51:59 UTC 2019

Hi Andrew,

El 2/7/19 7:29, "Andrew Alston" <Andrew.Alston at> escribió:

Hi Jordi,

Just saw this:

> In addition to that, there are some advantages such as the opex savings. It is less expensive to manage IPv6-only with IPv4aaS across your network than pure dual-stack. May be not 50% > savings, but still impacting a lot.

I’m really curious to hear you say this – because I am not sure I agree – I think it largely depends on how the v6 deployment is done.

I think I said at the beginning of my email. Every network is a case, so I was doing a generic case, based on my own experience in many deployments.

I see many networks doing dual-stack all the way thru, and *not* doing IPv6 monitoring, which is really wrong. Happy Eyeballs solve the problem most of the time, but of course they aren’t doing it right. If they do a good monitoring, they will need to do the same for IPv4 and IPv6, which definitively, consumes resources for the implementation and for ensuring the continuity of “both” networks.

Even in the case of cellular networks, if you have different PDP contexts, APNs, etc., means extra cost for licenses.

I’ve seen the same for some provisioning systems in broadband, they charge you double for dual-stack vs only IPv6.

In our case – we insist on enforced single-topology dual-stack and I’ve never seen a cost increase as a result. Nor have I seen a cost increase in the hardware – there is one particular vendor who – if you forget to ask for v6 licenses, will attempt to charge you for them afterwards, but after they tried that once – well, let’s just say I convinced them not to try that again with us.

The costs of running dual-stack often come from operational overheads – and that can be greatly reduced by running a single topology and treating v6 as a fundamental building block the same way you treat v4. As I’ve said in other emails – there are still fundamental problems that I see with a variety of services on v6 – particularly in the MPLS world – and we’re working very hard on solving this, but even with that, the base routing can still be done dual-stack single-topology without massive cost increases.

So – can you explain why you believe v6 is more expensive opex wise? It’s a really interesting viewpoint.



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