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I have some problems with my PPTP VPN server on Debian 7 x86. I'm mainly using Windows clients to connect to the VPN and this works. The VPN connection from client to server works, because in the client (10.5.5.10) I can access all services that are on the server (10.5.5.5), including ping 10.5.5.5.

However, if I try to access another client (e.g. 10.5.5.11) from my client 10.5.5.10, I get a timeout with ping. This means I can't access any client from another client. The strange thing is that I still can access the web server on 10.5.5.11 from 10.5.5.10.

If I try the same thing on my server (ping 10.5.5.10), it also gives a timeout, which means the server isn't able to see the clients at all, so that is probably the reason why clients are not able to connect to each other. In my VPN however, I need clients connecting to each other.

In my server configuration I defined the following:

option /etc/ppp/pptpd-options
logwtmp
localip 10.5.5.5
remoteip 10.5.5.10-254

These are the contents of my /etc/ppp/pptpd-options file:

name pptpd
refuse-pap
refuse-chap
refuse-mschap
require-mschap-v2
require-mppe-128
proxyarp
nodefaultroute
lock
ms-dns 8.8.8.8
ms-dns 8.8.4.4
nobsdcomp
noipx
mtu 1490
mru 1490    

There are no rules in my iptables firewall. I think the issue has to do something with routing, but I have no clue how to solve the problem. Thanks in advance!

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