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DNS problem vith 3G and VPN

Posted on 2010-09-17
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Last Modified: 2013-11-05
HI

I have a strange problem:
First som facts our company have a Checkpoint UTM-1 firewall R70.40.  There is also a site to site VPN to another site where there is a server called vgma03.domain.se. there is two domians in our site domain.com and domain.se. When users connect true a ADSL conenction and then use checkpoint SSL VPN or checkpoint remote agent (office mode) everything works perfekt. BUT when they use a 3G ´connection they cant get the right IP adress for the server in the remote site,. if you ping vgma03.domain.se they the external ip adress of it. If we ping its internal IPadress it answers correct. any other server in the domain.se are answer correct. We haveconfigured the VPN client to route al traffic true the firewall and still it use the 3G connections DNS for the remote site server.  I cant understand how to make the 3G connection to always use our internal DNS server when its connected  with VPN connections and external DNS when connected to internet only. The server in the remote site is an Exchange 2003. Thanks
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Question by:EjendalsAB
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5 Comments
 
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Expert Comment

by:John Hurst
ID: 33708735
The 3G connnection will often use a double NAT type of connection and this frequently does not play well with VPN. What VPN client do your users have on their computers? .... Thinkpads_User
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Author Comment

by:EjendalsAB
ID: 33713509
Hi

what dó you mean what VPN client they use mate? I wrote that in my question or do you mean excatly what version of the client?

BR

johan
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Author Comment

by:EjendalsAB
ID: 33713517
I would like to add that it works with same 3g dongel in a machine that uses Windows Xp.
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John Hurst earned 500 total points
ID: 33713556
Sorry, I skipped past the checkpoint client. However my point stands: Some 3G cards have trouble with VPN because of the strange NAT arrangement. The characteristics of 3G cards are also dependent on the OS they are installed in (at least that is my experience with them). ... Thinkpads_User
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LVL 94

Expert Comment

by:John Hurst
ID: 33937164
Thank you. I am sorry I could not be of more help. Consider if you wish the NCP Secure Entry clent (www.ncp-e.com)
... Thinkpads_User
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