How to check if IP Protocol 47
(GRE) and TCP port 1723 are open
You use pptpsrv.exe and pptpclnt.exe from Microsoft
Windows Support Tools. To use these command lines, run command prompt, type
pptpsrv on VPN server and pptpclnt server name or IP on the VPN client.
Here are the result from pptpclnt:
Obtaining host information...
Successfully resolved server's host information
Enter data to send to server (between 1 and 255 chrs.), then hit enter:
Successfully connected to server using TCP port 1723 (PPTP)
Sending data to server
Waiting for a reply to the data which was just sent...
Received a reply. Reply contains the following text:
Connectivity test to TCP Port 1723 was successful!!!
Closing down socket...
Creating a socket to test GRE protocol traffic...
Total GRE packets sent = 1
Total GRE packets sent = 2
Total GRE packets sent = 3
Total GRE packets sent = 4
Total GRE packets sent = 5
Check server to see if the GRE packets were received successfully
Closing down socket
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