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two issue on pptp vpn with windows client

The default settings for setup a pptp vpn on a linux server may be working with windows client. I have found two main issue:

1) the DNS issue
The windows client may not use the DNS on vpn server. Need to edit the registry table entry "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Linkage\Bind", move the line \Device\NdisWanIp to the first line of the value.

 2)  The ms-chap v2/mppe issue
With the issue, you shall found some website is not accessible but tcp connection is OK(like google talk), or some of website are working well but some not. You need to disable the encryption both on client/server setting.

For pptp server, you need comment "require-mschap-v2" and "require-mppe-128" in /etc/ppp/pptpd-options.

The issue may actually be caused by inconsistent mtu between the windows and linux server. You may check your windows mtu by "netsh interface ipv4 show subinterfaces". Or you may add a line in /etc/ppp/ip-up before the scripts returns, which are "/sbin/ifconfig $1 mtu 1500".


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