Hello Richard,

On Tuesday October 29 2019 20:17, you wrote to Alexey Vissarionov:

 AV>> FS... that's dual stack (why lite?), regardless of whether IPv4
 AV>> is CGNATed.

 RM> Because usually DS is NOT regardless weather you have a public v4 or
 RM> not. (DS usually means public v4/public v6; DS-Lite if you only have a
 RM> public v6 address)

 RM> DS-Lite is specified here:
 RM> https://tools.ietf.org/html/rfc6333
 RM> Dual-Stack Lite Broadband Deployments Following IPv4 Exhaustion

Another important caracteristic of DS-Lite is that on the IP level, the 
connection is IPv6 only. IPv4 is tunneled over IPv6.


Cheers, Michiel

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