Has anyone figured out how to solve this problem?
Very weird that VPN works OK with 3G but not with ADSL

Can someone please figure out how to solve this problem.
This seems to be some sort of protocol or software issue with iPad.
I can connect with XP, Win 7 and XP virtual session via VPN using my ADSL or 3G connections, but with iPAD2 it only works with the 3G.
(The 3G connection is via a portable Wi-Fi hotspot setup on a DELL Streak Android 2.2)

This problem seems to be really common. It is caused when the home network uses the same default gateway and the same IP address patterns as the VPN.

For example most routers use the default gateway 192.168.0.1 or 192.168.1.1 and all the IP addresses follow the same pattern. If you try to connect to the VPN with and then try and connect to say a server with the IP address 192.168.0.3 it tries to connect to the machine assigned with that IP address on the home network instead of on the VPN.

The solution is to change the default gateway of the router to something different. I just changed it to 192.168.2.1 and everything works perfect now.

I just wanted to comment on this, though it is an old thread, it is still just as valid, but no, I do not have a resolution, Just a clarification of the issue.

Firstly, I am an IT Engineer, and work with systems integration for a living. I have also worked with MANY mobile devices and tablets, in various ways, including rooting etc. So I think I have a good enough background to diagnose the issue. I have also seen this same problem on numerous devices, though this is the first that I have seen un-patched for so long.

This is definitely a problem with the coding of the VPN software. It is very easy to replicate using Fing (A free network scan app) and a VPN connection. While connected to the vpn, all scans will only show the local subnet. The cause really is not related to subnets or IP Schemes, though yes, that can cause a problem with multiple vpn clients. The cause is the underlying coding which forces all traffic through the vpn. This is also why it works on 3g, but not on wifi. The coding for a vpn client always has code specific to the adapter that is being used.

Apple - though I know you don't give a crap about any of your brainwashed subjects, let alone those of us that despise your name, this is your software. Please have a programmer look into the code and troubleshoot the traffic flow.

Thank you.

Put your wifi channel selector to channel 11. it always open and clear usually.

Hi

I was just wondering if Aga2571 or anybody else had found a solution to this, I have the same issue....

PPTP VPN connects fine on my iPhone and iPad via 3G (iPad tethered and using the iPhones 3G)

Windows 7 laptop connects to the VPN fine via wifi at home

Neither the iPhone or iPad will connect via wifi at home, they connect, authenticate and after a few seconds disconnect..... 'you were disconnected by the communication device'......

I have tried my phone on the work wifi and it seems fine....

My PPTP VPN ports are open (and the windows laptop works??), I have tried turning off any encryption and security I can see on the netgear router, tried the 'channel 11 idea, the VPN server IP is also in a totally different range to my home network.

Any ideas, its driving me mad.

Thanks

Rob

I just got the iPad 2 and was also having connectivity problems but I seem to have found a solution. I could connect to VPN on my PC and i can connect to wifi via my iPad but when i try to connect the iPad to VPN, it would connect on 3G but not on Wifi.

After reading the forums, and trying a few things, any one single thing didn't work but after trying a few things together, it seems to be working now. Here's what i did:

1. Go to iPad settings -> General -> Network -> Wi-Fi -> choose the wifi connection you're on and click the blue arrow -> change the DNS to 8.8.8.8
2. Go to Router Settings (i use Dlink) and change the default IP address. I changed it to 192.168.2.1
3. Setup your VPN on the iPad and click connect.

I dont know if this was just a fluke but everything's working great now. Hope this helps!

oh and i changed the channel to 11 as well. Although i dont think that was what got it working. Then again I could be wrong.