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Posted by Konstantinos Agouros on September 30, 2005, 7:10 pm
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>Kai Schaetzl wrote:
>> I'm trying to establish a VPN tunnel from my laptop over GPRS to my office
>> LAN. VPN works fine from broadband or dialup, but GPRS fails.
>>
>> Client is Windows XP, Server is pptpd/pppd on a Snapgear appliance, mobile
>> provider is O2 Germany.
>> It seems the GPRS connection works via NAT and that this may be the cause
>> of the problem. The log shows "LCP: timeout sending Config-Requests" which
>> might also indicate that my side couldn't answer because of NAT.
>>
>> Is there anything I can do about that concerning the server configuration?
>> I do have good knowledge about Linux and partly about networking but
>> exactly none about pptpd/pppd, I just use the web interface provided by
>> the router. I can edit configuration files (pptpd.conf and options.pptp as
>> I understand) directly if necessary.
>>
>> Other possible causes might be MTU or the GPRS gateway not allowing highly
>> encrypted authentication. I tried everything down to even no
>> authentication, nothing worked over GPRS. MTU seems to be at normal 1500.
>> So, I think both are not relevant here.
>>
>> Kai
>>
Are You sure, that Your VPN-Software can cope with NAT-traversal?
Microsoft PPTP stuff uses GRE and this can not be natted.
Konstantin
--
Dipl-Inf. Konstantin Agouros aka Elwood Blues. Internet: elwood@agouros.de
Otkerstr. 28, 81547 Muenchen, Germany. Tel +49 89 69370185
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"Captain, this ship will not survive the forming of the cosmos." B'Elana Torres
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