Alcatel Lucent AP-103 connected clients do not get Internet access via Telecom Italia ADSL

Be aware: I did not go too deep into this problem. Any further observation is welcome.

A colleague had an ADSL internet access from Telecom Italia attached to a Cisco 857 router, which did work fine. He connected to an Alcatel Lucent AP-103 access point (manufactured by Aruba Networks) to the router. WiFi clients were
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Fixed: Cisco VPN Client, a Huawei 3G usb key and network sniffing

I ran into a problem widely documented on the Internet. Using a USB 3G Huawei Internet key (in particular for me it is an E1692), for some reason the vpn created with Cisco VPN Client does not work. Indeed, the vpn is regularly established, but no packet is effectively routed through the vpn itself. Googling
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