Poptop Help GRE Error

[RandyRiegel]

I have a VPN setup on my home network with a RH Linux 9 system running off my cable modem IP address (it's supposed to be static but has never changed in the few year I've had it). I use PoPToP as my VPN software and can log into it from any internet connection perfectly using MS dailup networking with VPN adapter.

I have the same type of machine at my workplace and I have setup identical to my one at home but when trying to connect to it I get an error message. It connects and says "verifying password.." and then waits about 20 seconds and tells me it couldn't make a connection. Here is the syslog on the Linux machine:

---------------------------------------------
Jun 1 22:15:14 schina3 pptpd[17739]: CTRL: Client xx.xxx.xxx.xx control connection started
Jun 1 22:15:14 schina3 pptpd[17739]: CTRL: Starting call (launching pppd, opening GRE)
Jun 1 22:15:14 schina3 pppd[17740]: pppd 2.4.2 started by root, uid 0
Jun 1 22:15:14 schina3 pppd[17740]: Using interface ppp0
Jun 1 22:15:14 schina3 pppd[17740]: Connect: ppp0 <--> /dev/pts/0
Jun 1 22:15:14 schina3 /etc/hotplug/net.agent: assuming ppp0 is already up
Jun 1 22:15:44 schina3 pppd[17740]: LCP: timeout sending Config-Requests
Jun 1 22:15:44 schina3 pppd[17740]: Connection terminated.
Jun 1 22:15:44 schina3 /etc/hotplug/net.agent: NET unregister event not supported
Jun 1 22:15:44 schina3 pppd[17740]: Exit.
Jun 1 22:15:44 schina3 pptpd[17739]: GRE: read(fd=5,buffer=804d720,len=8196) from PTY failed: status = -1 error = Input/output error
Jun 1 22:15:44 schina3 pptpd[17739]: CTRL: PTY read or GRE write failed (pty,gre)=(5,6)
Jun 1 22:15:44 schina3 pptpd[17739]: CTRL: Client xx.xxx.xxx.xx control connection finished
-------------------

I'm pretty sure it has something to do with the GRE: read line that says Input/Output error but I have no idea what to look for. And what gets me is that the two systems are identical except one has a cable connection and one has a DSL connection.

Any help would be appreciated.
Randy

 

[RandyRiegel]

By the way, I have a Netopia 3564 Cayman ADSL Gateway w/ 4 Port Switch. I have the firewall setting on "Clear Sailing" so all traffic should be able to get through.

 

[ClemP]

HI,
I've got a very similar issue with a D-Link DFL-80 VPN Firewall. I assume that the firmware that runs the firewall is some version of embedded Linux. I was actually able to connect to the VPN a few times after initially configuring the firewall. Then I started getting an Error 619 when trying to connect via the XP VPN Client. When I check the firewall's connection log, I see the same messages as appear in your log.

After alot of hours on the phone with D-Link Tech Support and completely resetting both the firewall and the Speedstream 5100 DSL modem several times, I was able to connect to the VPN again. However, after connecting several times, I suddenly cannot connect again and am getting the same errors all over again!

Any help would be greatly appreciated!!!

Clem

 

[RandyRiegel]

My problem had to do with the router in front of my server. I had to change the router to "bridged" mode so it acted like a plain modem instead of a router.