secondo me è sotto nat
whois 109.117.202.001
% This is the RIPE Database query service.
% The objects are in RPSL format.
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http://www.ripe.net/db/support/db-terms-conditions.pdf
%WARNING:905: fixed lookup key
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% The key "109.117.202.001" has been changed to "109.117.202.1" for lookup.
% Note: this output has been filtered.
% To receive output for a database update, use the "-B" flag.
% Information related to '109.116.0.0 - 109.117.255.255'
inetnum: 109.116.0.0 - 109.117.255.255
netname: VODAFONE-IT
descr: IP addresses assigned to VF-IT mobile users
country: IT
admin-c: LV1834-RIPE
tech-c: RD2747-RIPE
status: ASSIGNED PA
mnt-by: VODAFONE-IT-MNT
source: RIPE # Filtered
person: Luca Vit
address: Vodafone N.V.
address: Via Jervis,13
address: I-10015 Ivrea, TO
address: Italy
nic-hdl: LV1834-RIPE
mnt-by: VODAFONE-IT-MNT
phone: +39 0125624819
source: RIPE # Filtered
person: Roberto De Cristofaro
address: Vodafone N.V.
address: Via Jervis,13
address: I-10015 Ivrea, TO
address: Italy
phone: +39 0125624624
nic-hdl: RD2747-RIPE
source: RIPE # Filtered
% Information related to '109.116.0.0/15AS30722'
route: 109.116.0.0/15
descr: IP route for VF-IT mobile customers
origin: AS30722
mnt-by: VODAFONE-IT-MNT
source: RIPE # Filtered
@degli mi spieghi come si può fare a saltare nat e permettere traffico in entrata tramite ddns