DualStack (CGNAT) vs Other Transition methods

Douglas Fischer fischerdouglas at gmail.com
Wed Feb 24 14:48:23 UTC 2021

> Is this pain you have lived or verified with first hand testing?
>> Yep! A lot!

LOL gamers can be pretty much insistent...
(haha.jpg +  haha-crying.jpg)

And Specifically on SIP/Voip over the Internet, with deep analysis at all
the parts involved.
The most common issue is incoming Calls to SIP endpoints behind 464Xlat
using IPv4 with unidirectional audio.
And several types of causes:
 - CPEs receives the RTP-Stream but doesn't Re-Map it correctly to the IPv4
inside end-point
 - Jool receives the RTP-Stream but ignores it and don't map it to the
"fake" v6 address
 - Some APPs do (by some crazy reason) the re-write of Session Layer header
to v6 address, and Sip-Proxys ignores it...

After hours and hours fighting against the lions, we decided:
"Let's keep those clients in Dual-Stak and CGNAT" and it just worked.

And after that, the obvious conclusions:
 - Why will us keep that much options of endpoints connections, if only one
solves all the problems?
 - We will need to train the guys on the Dual-Stack/CGNAT Scnario, and
464Xlat Scenario... Knowing about Danos, about Jool...
 - It doesn't scale!

Douglas Fernando Fischer
Engº de Controle e Automação
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