Forum Discussion

Tutor

Oct 31, 2016

Solved

PPTP VPN instable

The PPTP VPN of our FVS336Gv3 is configured according to instructions in KB article. I connect to FVS336Gv3 from home, using a Windows 10 VPN Client. The Win LAN address is 192.168.0.0/24, when conne...

pptp

Troubleshooting

Windows 10

DaneA
Nov 17, 2016
Hi BGy,

You're welcome! :) I'm glad you have configured L2TP/IPsec successfully and it seems this works best for you.

Since you have chose L2TP/IPsec over PPTP VPN, I encourage you to mark the appropriate reply as the “Accepted Solution” so others can be confident in benefiting from the solution. The NETGEAR Community looks forward to hearing from you and being a helpful resource in the future!

Cheers,

DaneA

NETGEAR Community Team

BGy

Tutor

Nov 06, 2016

Version is 4.3.4-2. I tried continous ping test: when RDP freeze, I no longer can ping 192.168.50.100 or any machine in the remote network.

I guess stability depends on the traffic. I left alone my machine after establishing VPN connection. After 2 hours, it was still connected but when I opened RDP it freezed after some second.

DaneA

NETGEAR Employee Retired

Nov 10, 2016

Hi BGy,

Is the Windows 10 VPN client connected wired or wireless?

Kindly try to lower down the MTU size on the FVS336Gv3 and this might help. Kindly read pages 66-67 of the FVS336Gv3 reference manual here on how to change the MTU size.

Let us know the results.

Regards,

DaneA

NETGEAR Community Team

BGy
Tutor
Nov 10, 2016
Hi DaneA,

Windows 10 client connected wired.

Tested two MTU:
1492: PPTP VPN connection established succesfully, but I can't open Remote Desktop.
1400: I can't open VPN connection neither L2TP nor PPTP.
c:\>ping kb.netgear.com -f -l 1472 Pinging netgear-us.custhelp.com [129.152.38.176] with 147 bytes of data Reply from 129.152.38.176: bytes=147 time=114ms TTL=241 Reply from 129.152.38.176: bytes=147 time=120ms TTL=241 Reply from 129.152.38.176: bytes=147 time=116ms TTL=241 Reply from 129.152.38.176: bytes=147 time=113ms TTL=241 Ping statistics for 129.152.38.176: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 113ms, Maximum = 120ms, Average = 115ms
The max is 1472, trying MTU 1473 results no echo ("Packet needs to be fragmented but DF set." ).
But 1472+28=1500 which is the router default.

What MTU do you recommend?

BR
- DaneA
  NETGEAR Employee Retired
  Nov 13, 2016
  Hi BGy,
  
  If ever you are willing to experiment, you can moderately reduce the value of the MTU from the maximum value of 1500. Kindly check the table below as reference:
  
  Regards,
  
  DaneA
  
  NETGEAR Community Team
- DaneA
  NETGEAR Employee Retired
  Nov 16, 2016
  Hi BGy,
  
  I just want to follow-up on this. Any updates?
  
  Regards,
  
  DaneA
  
  NETGEAR Community Team
  - BGy
    Tutor
    Nov 17, 2016
    Hi DaneA,
    
    I gave up struggle with PPTP... I configured L2TP/IPsec successfully, it seems very stable and throughput is double (13 vs. 6.5MBps). But there is a decision to use IPsec with Netgear VPN Lite Client soon, in order to achieve the maximal (44Mbps) VPN bandwith. Thank you for your support.
    
    My personal opinion and recommendation to others: It does not make sense to struggle with PPTP, forget it, use L2TP.
    
    BR