VPN over GPRS not working?
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Posted by Kai Schaetzl on September 29, 2005, 3:31 am
Please log in for more thread options 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 | ||||||||||||||||||||||||||||
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Posted by Mike Drechsler - SPAM PROTECTE on September 29, 2005, 7:29 pm
Please log in for more thread options Kai Schaetzl wrote: Nothing you can do but complain to the GPRS service provider. -- WARNING! Email address has been altered for spam resistance. Please remove the -deletethispart-. section before replying directly. Mike Drechsler (mike-newsgroup@-deletethispart-.upcraft.com) | ||||||||||||||||||||||||||||
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Posted by Kai Schaetzl on September 29, 2005, 11:31 pm
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Mike Drechsler - SPAM PROTECTED EMAIL schrieb am Thu, 29 Sep 2005 19:29:00 GMT: > Nothing you can do but complain to the GPRS service provider.
Figured that, thanks! Kai | ||||||||||||||||||||||||||||
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Posted by Martin Bodenstedt on September 30, 2005, 9:32 am
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Mike Drechsler - SPAM PROTECTED EMAIL schrieb: > 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. > Nothing you can do but complain to the GPRS service provider.
I don't think so. NAT on the client side normally is no problem. The long latency of the link could be a problem however - and that is intrinsic to IP traffic over GSM (with/out GPRS)... -- Martin Bodenstedt www.maboko.de / www.die-bodenstedts.de | ||||||||||||||||||||||||||||
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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 ---------------------------------------------------------------------------- "Captain, this ship will not survive the forming of the cosmos." B'Elana Torres | ||||||||||||||||||||||||||||
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> 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
>