Link to home
Start Free TrialLog in
Avatar of Zia Durrani
Zia DurraniFlag for United States of America

asked on

Can't ping resources after establishing a PPTP VPN

After I establish a PPTP VPN connection to my server, I can't ping anything.  My network consist of Verizon Fios router, SonicWALL TZ 100 (sits behind Fios router), SBS 2008, Windows 7 and Windows XP.  Any help will be appreciated.  Thanks.
Avatar of scraby

are you establishing vpn to the tz100 or the sbs box?
Avatar of Blue Street Tech
Hi Infotech2008,

Setup the proper configuration on the SonicWALL to allow PPTP to pass through by the Public Server Wizard located at the top right hand side once you login to the SonicWALL.

Basically it will auto create all the necessary fields:
Address Objects
NAT Policies
Access Rules
sorry, missed yur first sentence where you connect to server......diverseit is correct, you need to allow pptp pass through the tz100 and the wizard is the easiest way
Avatar of Zia Durrani


I am establishing VPN connection to the SBS box.  Thanks.
Before Verizon fios, we were using Cox Business Internet and VPN was working like a charm.  When we switched, the VPN stopped working.  Nothing changed on the SonicWALL.  On the Verizon Fios router sitting in front of my SonicWALL, is setup to port forward to 1723 and GRE to SonicWALL and SonicWALL to server IP address.  I am successfully able to connect but I am not able to ping.
There is a difference in the gear the ISP supplied though. COX typically supplies a modem or a Ethernet-ready cable, FIOS you say is providing a router. In the COX setup port forwarding would occur on the SonicWALL as it should but now with a router you shouldn't need to port forward on the router but rather route the external IPs to the SonicWALL so that it can handle port forwarding. If you can setup the router into bridge mode if possible. I'd call FIOS support to see if it can be done on your specific router.
Did you create the VPN using RRAS or the SBS wizard under SBS console | neetwok | connectivity?
If used RRAS you should right click on the server in the RRAS console, choose disable, then run the SBS wizard.  The wizard configures the VPN, Firewall, routing, and NPS.
Did disable and used the wizard in RRAS.
You have two NAT devices; Verizon router and Sonicwall.  PPTP does not like dual NAT.  In the past I have only seen this fixed by putting the Verizon router in Bridge mode.  This eliminates its NAT feature and assignes the public IP to the Sonicwall.  On it port 1723 needs to be forwearded to the server and GRE passthrough enabled on the Sonicwall.

Does your Sonicwall have licensing for an IPSec VPN?  That would be more secure and perform slightly better than the Windows PPTP VPN.
According to Verizon tech support, it cannot be set to bridge mode.  No, it does not have IPSec VPN license.  Does IPSec VPN works with dual NAT?  So, you are telling me that PPTP will not work with my current configuration.  Correct?  I am not surprised, I searched online and didn't come across a fix.  My client made up his mind to switch back to Cox Internet.  The modem was set to bridge mode.
Avatar of Rob Williams
Rob Williams
Flag of Canada image

Link to home
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
Start Free Trial
My client feels comfortable with VPN config.  RWW is setup and good to go as an alternative.  He is old school.  I appreciate your help.  Thanks.