[ipv6-wg] IPv6 only network at RIPE 68

On 17/05/14 11:46, Philip Homburg wrote:
> Is NAT464 over wifi or wired ethernet really easier than IPv6 native plus
> NAT44?
>
> I know NAT464 has advantages for 3G networks, but I have not seen anymore
> doing a comparison for wifi. Does anyone have a pointer?

2G/3G/4G and Wifi are two different things when we come to IPv6 
provisioning.

In 234G "mode" the pdpv6 context is established to SGSN and forwarded 
towards GGSN back in your home mobile network. When establishing pdpv6 
context many things happen, "proprietary" IPv6 address provisioning (not 
DHCPv6 or RA or something similar) and also other parameters, including 
DNS resolver. Next thing that happens is that Android creates a CLAT 
virtual interface as soon as you establish pdp context, discovers the 
NAT64 prefix from your DNS64 server by asking for known A-only record 
and 464XLAT automagically starts to work and Skype does not complain 
anymore.

With wifi things are different. There is still this bug that connection 
is marked non-working if there is no IPv4 address, but that's something 
that Google can probably fix pretty quickly. Next thing is that Android 
does not support DHCPv6 *at all* and probably never will. Maybe Erik or 
Lorenzo can explain it to you more thoroughly as I don't know what 
information has been published and what not ;)

So next thing to look is RA included RDNS information that now growing 
number of OS-es and devices supports - and I need to check if this was 
already implemented in Android as there were rumors that suggested it.

This brings us to a conclusion that 234G connection would work 
perfectly, but if you use wifi you get the IPv6 address, but no DNS and 
your connection will probably be marked as invalid.

Cheers, Jan