On Thu, 11 Oct 2012, Tore Anderson wrote:
* Mikael Abrahamsson
On Thu, 11 Oct 2012, Tore Anderson wrote:
That some features are available only on the most advanced access
technology is perfectly reasonable and to be expected, IMHO. If not,
what's the point of upgrading at all?
Uh, whut? I expect my ssh sessions to survive a 4G->3G handover, and if
they happen to go over IPv6, I want them to survive.
In my experience, long-lived sessions are unreliable when you're on the
move anyway. Go into an elevator? Sessions drop. Subway heads into a
tunnel? Sessions drop.
I guess you and me have radically different experience of mobile phone
networks and how well they work.
I think this is a really poor excuse for not supporting IPv6 and IPv4v6
in any case. Unless I'm gravely misinformed on how 3GPP mobile networks
work, there is absolutely no reason why you cannot on LTE simultaneously
support IPv4, IPv6, and IPv4v6. That the LTE network additionally
supports IPv6/IPv4v6 does not *in any way* prevent you from sticking to
IPv4 in all cases and enjoying the exact same session mobility between
2G/3G/4G as you can if the LTE network only supports IPv4.
IPv4v6 on LTE is a no-brainer, I did first tests with that 1.5-2 years
ago. IPv6 only on 2G/3G/4G also works well. Not that many devices with GA
firmware supports this unfortunately.
The session mobility problem will not go away completely by upgrading
the 2G/3G part of the network, too. As I understand it, there's no
shortage of devices on the market that only supports IPv6 on LTE, but
not on 3G. Apple's iPhones and iPads, for example. So while it won't be
the network's fault, it doesn't really matter - from the end users's
point of view, the exact same thing will happen.
Well, with the current end user device situation, focus is on usb dongles.
They seem to support all combinations just fine.
Besides, the LTE network is being touted as a potential replacement for
wired broadband. In that use case, the end user isn't likely to be
mobile at all - presumably he'll have some CPE sitting in his window
sill within LTE coverage 100% of the time. So no session mobility
issues, and all the potential to be provisioned with IPv6 access. But
no.
Sure. But now you will probably have a 4G router with NAT44, with no IPv6
support at all. I'd gladly take hints of devices with proper IPv4v6
support in this area.
The important reason to upgrade is to get higher speeds, not to get
access to new L3 tech.
Missed opportunity if you ask me. We could have had both.
Yes we could, and we will. Just because someone isn't doing it *now*
doesn't mean it won't be done in the not so distant future.
--
Mikael Abrahamsson email: swm...@swm.pp.se
