Re: [v6ops] draft-pauly-v6ops-happy-eyeballs-update-01

Hi Cameron,

Jordi was asking us to phase out Happy Eyeballs because it masks breakage in the network,
and what plan we could build to gradually phase it out. My response was that if you, as a
network operator, prefer to avoid Happy Eyeballs, you can deploy IPv6-only, as that will
in effect disable HE.

The scenario you describe is the opposite: you have a broken server and want HE to
hide that breakage from users. The tradeoff here is slightly different since that breakage
is much less widespread. It is something that a NAT64-aware HE stack could provide though.

David

> On Mar 29, 2017, at 13:22, Ca By <cb.list6@gmail.com> wrote:
> 
> Just a comment following up on Jordi's Mic comment
> 
> Jordi said there was an issue with HE hiding IPv6 issues.
> 
> David's response was something along the lines of "deploy ipv6-only".  I did not really understand this.
> 
> When folks deploy ipv6-only, they find they are all alone with a broken ipv6 scenarios that work on all their competitors IPv4-only networks and HE dual-stack networks.
> 
> Also, friendly reminder that Dan Wing catalogs a subset of the websites that fail on ipv6-only http://www.employees.org/~dwing/aaaa-stats/ <http://www.employees.org/~dwing/aaaa-stats/>
> 
> And, my customers still complain about www.fra.dot.gov <http://www.fra.dot.gov/> ... this works for everyone but me... because of HE...and I am already on IPv6-only ... and nobody will fix it.  This issues has been known by the USG DOT for over 3 months, noted to NANOG, nobody cares to fix it.
> 
> So, perhaps there is room in the I-D for including NAT64 synthesized address candidate set.  Meaning the HE algo on an IPv6-only host would include the set of available native IPv6 answers as well as a 500ms timer for attempting an A query with using whatever mechanism is available to the host for relaying IPv4 packets across an IPv6 only network (RFC6877, Bump in API, ...) 
> 
> Without this, IPv6-only networks are at a painful disadvantage since IPv6 must be perfect while every other scenario has HE to mask brokenness. 
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