03-07-2012 03:36 AM
I am trying to allow PPTP traffic through my Linksys WRT320n to a PPTP VPN server on my home network.
The Linksys WRT320n is running firmware 1.0.05 build 002Mar 31, 2011.
I have created a Port Forwarding rule on the Linksys to allow TCP & UDP port 1723 through to my internal IP of the PPTP VPN server,
but everytime I try to connect with a PPTP client from outside of my network I get a connection error on the client.
Checking the PPTP VPN servers logs I see the following errors (Please note all IP's have been masked)
Mar 2 11:15:07 ap-01 pptpd: CTRL: Client x.x.x.x control connection started
Mar 2 11:15:07 ap-01 pptpd: CTRL: Starting call (launching pppd, opening GRE)
Mar 2 11:15:07 ap-01 pppd: pppd 2.4.4 started by root, uid 0
Mar 2 11:15:37 ap-01 pppd: Exit.
Mar 2 11:15:37 ap-01 pptpd: GRE: read(fd=8,buffer=41fe30,len=8196) from PTY failed: status = -1 e
rror = Input/output error, usually caused by unexpected termination of pppd, check option syntax and ppp
Mar 2 11:15:37 ap-01 pptpd: CTRL: PTY read or GRE write failed (pty,gre)=(8,9)
Mar 2 11:15:37 ap-01 pptpd: CTRL: Reaping child PPP
Mar 2 11:15:37 ap-01 pptpd: CTRL: Client x.x.x.x control connection finished
From looking at the above errors, it seems as if the Linksys isn't forwarding GRE through to my PPTP server.
I have tried various settings, including enabling and disabling the PPTP Passthrough option on the Linksys
but still can't get PPTP to work.
What is the correct way to get GRE traffic forwarded through the Linksys ?
03-08-2012 04:30 PM
Well you can try the following settings.
# Open up the browser and on the address bar type 192.168.1.1 that will open up the router setup page.
# Then click on Security tab disable SPI Firewall Protection, uncheck Filter Anonymous Internet Requests...
# Then click on Administration Tab and disable the UPnP option..
Now check the connectivity status..
03-11-2012 11:59 AM
Try to reflash the firmware of the router which can be downloaded from the following link: http://homesupport.cisco.com/en-us/support/routers
Push the reset button on router for 30 seconds, turn off the router wait for 30 seconds and then power it on. Power light should blink when you perform the reset process.
After reset, reconfigure the router and then check the connectivity status of the router.
03-22-2012 04:55 AM
I do have the same issue. PPTP VPN server is located behind WRT320n and router does not pass IP GRE 47. In incoming logs in router is TCP 1723 connection but it does not reach VPN server. Internet client is getting error 619.
It looks like a bug of Linksys router :/ Of course PPTP Pass-through is enabled