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Applet to Prevent VPN Timeouts

Posted on 2008-06-20
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Last Modified: 2012-08-13
I have a couple clients with whom I have VPN accounts where the VPN servers are configured with short timeout periods.  (5 minutes, I believe.)  If I'm using VPN, and I hop over to a local application even for a brief period of time, I get a timeout.  To reestablish my work on the client server, I typically have to logon via VPN and then logon via RD as well.  It's a pain.  Is there a little applet out there (or even a BAT script, VBS script, or a VB.NET piece of code) that would maintain a minimal level of activity through the VPN tunnel that would prevent these timeouts?
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Question by:jdana
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by:purplepomegranite
ID: 21830492
It would be very easy to write a script to ping the server at intervals (this is usually enough to keep a connection alive).  Or you could just:

ping (server) -l 1 -t

where (server) is the IP address of a server the other side of the VPN.  The above from a command prompt, and it just pings with one byte of data (the l parameter can be adjusted if this is not enough).

BUT... you say it times out, are you actively disconnected, or does the VPN simply stop working?  If you exceed the Windows idle time, the server will disconnect the VPN.  If the connection just goes dead (but looks like it is connected), then there is likely to be another issue.
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Author Comment

by:jdana
ID: 21830921
purplepomegranite (nice name),

It is a timeout (as opposed to VPN stopping).  

ping (server) -l 1 -t seems pretty good.  Any idea how to call it from a vbs script?  (I'd like to drop it in a loop to slow it down a bit.)
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purplepomegranite earned 250 total points
ID: 21834946
The attached code will ping until the first unsuccessful ping (or you stop the script with <CTRL><C>).  Just change the parts I've commented.  It outputs the result to the command window.
Option Explicit

dim blnPinged, strHost

strHost="www.google.com"  ' Change the address to where you want to ping

blnPinged=true
 

while blnPinged ' Loop while ping is successful

	blnPinged=Ping(strHost)

	if blnPinged then

		wscript.echo "Pinged " & strHost & " successfully at " & Now

		WScript.Sleep 1000 ' 1000 is one second, adjust accordingly

	else

		wscript.echo "Ping failed to " & strHost & " at " & Now

	end if

wend
 
 

Function Ping(strHost)

	dim objPing, objRetStatus

	set objPing = GetObject("winmgmts:{impersonationLevel=impersonate}").ExecQuery _

	("select * from Win32_PingStatus where address = '" & strHost & "'")
 

	for each objRetStatus in objPing

		if IsNull(objRetStatus.StatusCode) or objRetStatus.StatusCode<>0 then

			Ping = False

		else

			Ping = True

		end if

	next

End Function

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Author Closing Comment

by:jdana
ID: 31597260
Awesome!  Thanks!
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