[AusNOG] IPv6

[Paul Brooks]

On 26/03/2015 11:32 PM, Noel Butler wrote:
>  
> I run v6 at home courtesy of HE, have done for a while, my mrtg graphs dont get
> above a few hundred kB a day for v6 traffic - mostly to google I dare say, hell, not
> even twitter goes via 6, and IDGAF about faecesbook so no traffic goes any direction
> near that hole.

And the HE tunnel will be the problem. Most applications (and in particular web
browsers) implement 'Happy Eyeballs' (https://tools.ietf.org/html/rfc6555), and try
both IPv6 & IPv4 connections at the same time, then use whichever protocol established
a connection quickest. Google, Twitter, G Maps, Yahoo, Akamai etc are all v6-enabled -
but until your IPv6 RTT is similar to your IPv4 RTT, your apps will continue to  use
IPv4 in practice. That few hundred kB a day is probably successful IPv6 connections
being established 100 ms behind the IPv4 equivalent, and then not being used for
application data.

Those with native IPv6, where the RTT for both is effectively the same, see 40 - 50%
of traffic over IPv6. Or use a tunnel that terminates locally.

If you run Firefox as your browser, the '4or6' AddOn allows you to set the browser to
disable IPv4, or to keep both but disable fast-fallback (aka Happy Eyeballs) so it
will wait for IPv6 to timeout before trying IPv4. Turning off 'FastFallback' should
help push a lot more traffic over to IPv6 similar to how native dual-stack would allow.

Paul.










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