----- Original Message ----- > From: "Brian E Carpenter" <brian.e.carpenter@xxxxxxxxx> > To: "Franck Martin" <franck@xxxxxxxxxxxxxxx>, "IETF" <ietf@xxxxxxxx> > Sent: Tuesday, January 24, 2017 4:33:22 PM > Subject: Re: IPv4 outage at next IETF in Chicago > On 25/01/2017 12:11, Franck Martin wrote: >> I think it is time to move to the next level of IPv6 deployment. >> >> Ideally the IETF WiFi network should now only provide the following 2 networks: >> 1)IPv6-only >> 2)IPv6-only with NAT64 >> >> The later should be the default network. >> >> However you would say, well some stuff will break, some non technical people >> will use the IETF network and may have a bad experience, etc... >> >> So to be conservative but at the same time futurist and like it was done a few >> years back, why not create again an IPv4 outage of a few hours where the above >> 2 networks would be the only networks available? > > That would be a good way of damaging IETF productivity for a few hours. Do you have evidence of applications not running in a NAT64 environment? I'm interested to know them. > > And for what? Moving away from the mainstream coexistence mechanism (dual > stack), > to a mechanism known to be intrinsically defective (NAT). I don't see the point. > I fail to see how NAT is intrinsically defective, since it is used successfully by everyone... Nevertheless, the goal here is to get the Internet designers (IETF) to have operational experience on what needs to be fixed. When the IPv4 outage happened a few years back, it gave a serious impetus in getting IPv6 totally mainstream on many platforms. IAB encourages IPv6: https://www.iab.org/2016/11/07/iab-statement-on-ipv6/ However going IPv6-only can only be done in walled gardens. There still will be many environments with IPv4 only. A solution here is to move networks to NAT64, so you only need to support IPv4 at the edges... Yes creating an outage for the sake of an outage is pointless, experience on what works and not work needs to be recorded. May be the first step instead of doing an outage is to have as default a NAT64 network at IETF meetings and a dual stack network for the people that experience issues.