On 23Mar22, Owen DeLong via NANOG allegedly wrote:

> I would not say that IPv6 has been and continues to be a failure

Even if one might ask that question, what are the realistic alternatives?

1. Drop ipv6 and replace it with ipv4++ or ipv6-lite or whatever other protocol 
that
   magically creates a better and quicker transition?

2. Drop ipv6 and extend above the network layer for the forseeable future? By 
extend I
   mean things which only introduce ipv4-compatible changes: NATs, TURN, CDN at 
the edge,
   application overlays and other higher layer solutions.

3. Live with ipv6 and continue to engineer simpler, better, easier and 
no-brainer
   deployments?

I'll admit it risks being a "sunk cost falacy" argument to perpetuate ipv6, but 
are the
alternatives so clear that we're really ready to drop ipv6?


> so much as IPv6 has not yet achieved its goal.

As someone previously mentioned, "legacy" support can have an extremely long 
tail which
might superficially make "achieving a goal" look like a failure.

Forget ss7 and SIP, what about 100LL vs unleaded petrol or 1/2" bolts vs 13mm 
bolts? Both
must be 50 years in the making with many more years to come. The glacial grind 
of
displacing legacy tech is hardly unique to network protocols.

In the grand scheme of things, the goal of replacing ipv4 with ipv6 has really 
only had a
relatively short life-time compared to many other tech transitions. Perhaps 
it's time to
adopt the patience of the physical world?


Mark.

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