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PPTP VPN fails to work after installing Motorolla NVG510

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PPTP VPN fails to work after installing Motorolla NVG510

Hello,

 

I can run an IPsec VPN, but the PPTP VPN falis to work since I got U-verse with this modem (used to work over DSL). Does anyone know of a VPN passthrough setting for the NVG510 ? 

 

I run MacOS Lion 10.7.2, and my IPsec client only works in 32 bit mode. Want to be able to run in 64 bit mode with native Apple PPTP VPN client. I've confirmed that the PPTP VPN fails to work now on my 10.6 machine, so it's the AT&T modem, not Lion.

 

<flame on>

When I contacted AT&T support to ask for details, I first got bounced to a different chat session, then was told to call a number, and then was told that only "Special Services" knows how to deal with VPNs, then the first person I spoke to there didn't know what a VPN was. On insisting for someone who knew what that was, I was given a manager who then told me that I was required to pay for help. Pay for something that AT&T broke?! No, thank you, I said. She politely offered to transfer me back to the first people (U verse support) who know nothing about VPNs, and I agreed in order to try at least to get a modem manual and CD. But on transferring, I was disconnected! 

<flame off>

 

Further details from Console:

Oct 13 10:34:58 filbert  pppd[1533]: PPTP connection established.

Oct 13 10:34:58 filbert  pppd[1533]: Connect: ppp0 <--> socket[34:17]

Oct 13 10:35:28 filbert  pppd[1533]: LCP: timeout sending Config-Requests

Oct 13 10:35:28 filbert  pppd[1533]: Connection terminated.

Oct 13 10:35:28 filbert  pppd[1533]: PPTP disconnecting...

Oct 13 10:35:28 filbert  pppd[1533]: PPTP disconnected

 

From what I've been able to determine, the modem is not forwarding GRE protocol packets, but can't figure out how to enable that on the modem.

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Message 1 of 54
Tutor

Re: PPTP VPN fails to work after installing Motorolla NVG510

At this time, forget trying to get PPTP based vpns working with just an NVG510. I'm using firmware 9.0.6h0d48.

 

A PPTP based vpn uses TCP port 1723 and IP protocol 47 (GRE). Put simply, the NVG510 will not pass the GRE protocol from a client machine through its NAT to the WAN. Note that the NAT/Gaming settings are only for INBOUND connections from the WAN ie not relevant to initiating a PPTP vpn within the NVG510's LAN. An IPSec based VPN does not use GRE but rather other IP protocols (including port 500) and it works fine.

 

The only way to support a PPTP based vpn appears to be to use a secondary router with the NVG510 is passhrough mode since Passthrough does pass GRE. Thats what I've had to do.

Message 46 of 54
Contributor

Re: PPTP VPN fails to work after installing Motorolla NVG510

Could you please explain how to setup a secondary router. I have ATT DSL router will that work?

Message 47 of 54

Re: PPTP VPN fails to work after installing Motorolla NVG510

Mid-April now, and still no firmware updates for this {word filter evasion}. Nice job, ATT... (this would be a perfect place to use a 'sarcasm' font...)

Message 48 of 54
Tutor

Re: PPTP VPN fails to work after installing Motorolla NVG510

I had been using my workaround to use VPN on my NVG510 for the past few months, but just recently, even the workaround stopped working.

 

I found a "workaround to the workaround", which is working for me, but is still rather annoying and time consuming to do.

 

What I did was:

 

1) go into the NVG510 router menu 

2) Click on Firewall at the top, then click on IP Passthrough

3) Enter the access code for your NVG510

4) You will now be at the IP Passthrough menu screen

5) For Allocation mode, select "None"

6) Hit "Save"

7) The screen will state "Changes Saved" and to restart the device. Restart the NVG510 router

8) Reboot your client machine.  Completely shut it down, then power it back on.

9) When rebooted, go back into the NVG510 router menu

10) Click on the Firewall at the top, then click on IP Passthrough

11) Enter the access code for your NVG510

12) You will now be at the IP Passthrough menu screen

13) For Allocation mode, select "Passthrough"

14) This should revert to your previous passthrough settings.  You should not need to enter anything else, as they are already populated

15) Hit "Save".  DON'T RESTART YOUR NVG510.  It will tell you the changes are saved, and restart, but DON'T restart the NVG510!  If you do, you still won't be able to VPN.

16) Restart your client computer.  Completely shut it down, then power it back on.

17) Log in as usual.  Connect to VPN, and it should work again.

 

I've found that this works, but after a couple days, it will for some reason stop allowing the VPN to pass through, and I have to repeat steps 1-17 again, and it will work.

 

If this didn't work for you, try doing a factory reset, then do steps 1-17.  I've had to do that once as well, because nothing worked, but after doing the factory reset, then steps 1-17, it worked again.

 

I hope this helps people out there where the workaround stopped working.  Now I just wish they'd come out with the firmware update so I can stop doing this.

 

 

 

Message 49 of 54
Tutor

Re: PPTP VPN fails to work after installing Motorolla NVG510

Apparently, something has changed as I can now connect via PPTP to my network VPN. I'm pretty sure that ATT updated the firmware and I now have version 9.0.6h2d21. Anyone else able to connect now?

Message 50 of 54
Tutor

Re: PPTP VPN fails to work after installing Motorolla NVG510

I switched modems to the older Motorola IP-DSLAM modem.

 

Upon switching several months ago, all my connectivity issues immediately went away, and I haven't turned back since!

Message 51 of 54
Tutor

Re: PPTP VPN fails to work after installing Motorolla NVG510

I have just tested, and can confirm that PPTP VPNs work for me also, without using the passthrough workaround.

 

Finally.

Message 52 of 54
Contributor

Re: PPTP VPN fails to work after installing Motorolla NVG510

hello all i am new here and i am happy to be a part of such a technological discussion i was also finding a issue about pptp vpn and i get the information i think this PPTP VPN article helps you check this

 

Thanks


Regards

 

Haris Altaf

Message 53 of 54
Highlighted
Tutor

Re: PPTP VPN fails to work after installing Motorolla NVG510

Thanks for the information, but I'm not sure how pertinent this is to the issue we were discussing. The issue we were having was that PPTP was being blocked by the NVG despite the configuration showing that it wasn't. After the latest firmware update, PPTP is now being allowed through the NVG.

Message 54 of 54
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