Question about cgdcont --> ip, ipv4v6, ipv6 --> MM--> NM?

[Thomas Schäfer <tschaefer t-online de>]

Hi,

I am testing a little bit ipv6 (v6 only and v4/v6-dualstack) mobile 
connections via UMTS and LTE.

While modemmamanger

mmcli -m 0 --simple-connect="apn=internet,ip-type=ipv4v6"
mmcli -m 0 --simple-connect="apn=internet,ip-type=ipv6"

works. (using qmi, mbim and/or at+cgdcont ) I want to go up - to 
networkmanager.

So I am missing the possibility to configure the apn-type via NM .

(gsm section)
https://developer.gnome.org/NetworkManager/unstable/ref-settings.html


http://cgit.freedesktop.org/NetworkManager/NetworkManager/tree/libnm-util/nm-setting-gsm.h

How is it possible to set the IP-version? 

Which connection-editor(gnome, kde ...) is able to do it?

Regards,

Thomas