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I use VPNC (the command line client from the package vpnc) to connect with my institution. The configuration file looks like this

IPSec ID CiscoGroup
IPSec gateway xxx.xxx.xxx
IPSec secret XXXXXXXX
IKE Authmode psk
NAT Traversal Mode cisco-udp
Xauth username xxxxxxx

The VPN connection works like a breeze if I use my wireless interface. However, if I am connected to the internet using a UMTS stick ("Lidl stick"), it no longer does. The UMTS alone is working -- I can use it to connect to the internet. The vpnc client gets started with no apparent errors, so it can approach and talk to the gateway and establish a connection. However, the moment it goes into background, I loose all connectivity.

This is not a DNS problem -- using IPs does not help.

Interestingly, I can still ping one and only server -- the gateway. Nothing else.

Is this a known problem? Is there a solution?

Ubuntu 14.04

1 Answer 1

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For some reason, changing the NAT mode used to 'force-natt' allows the connection to proceed normally. I changed the relevant line in the config file:

NAT Traversal Mode force-natt

Why this does work, however, I do not know. Therefore, I do not consider this to be the complete answer.

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  • Hi! Perhaps you have better information now? Can you add some more information?
    – Anwar
    Nov 19, 2016 at 11:00

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