SOLVED:

many thanks to all @ swisscom who helped me

issue solved.

for propperness:

it was CG NAT, not ds-lite

(I had a week ago an issue with UPC and ds-lite; so was my fault)

now back to dual stack and all works :)

have a nice weekend,

cheers

stephan

2017-10-27 9:00 GMT+02:00 WolfSec-Support <support@wolfsec.ch>:

Hello,

could be someone from swisscom so kind and contact me offlist via email please.

our customer has a swisscom dsl connection and last week they changed these to v6.
he already tried 3 times via swisscom helpdesk without success.
the first level seems to have no idea about ds lite and v6... ;-/

we want to go back to v4 native.
in customer center we have deactivated v6 - but it is still online via v6 and ds-lite

we did all what was explained:
- switchoff modem for an hour
- reboot 3 times router etc

effectively now the vpn is for sure not working via ds lite and carrier grade NAT....

thanks in advance

Stephan

Besten Dank.

Freundliche Grüsse,
WolfSec-Support

WolfSec
Postanschrift:
Swiss Post Box: 104213
Zürcherstrasse 161
CH-8010 Zürich

http://www.wolfsec.ch