I am having a problem with a VPN provider's client software on my Windows Server 2012 R2 machine. I'm using TAP-Windows 9.21.1 and have two adapters in use: LAN adapter and the TAP adapter. I have NAT on the TAP adapter set to public and NAT on the LAN adapter set to private. I also have IPv4 routing and remote access server turned on. (let me know if you need any other details)
The issue seems to be that TAP adapter will incorrectly receive an IP address. The software will send the DHCP info to the TAP adapter:
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Set TAP-Windows TUN subnet mode network/local/netmask = 192.168.200.0/192.168.200.4/255.255.255.0 [SUCCEEDED]
Wed Dec 02 09:53:30 2015 Notified TAP-Windows driver to set a DHCP IP/netmask of 192.168.200.4/255.255.255.0 on interface {8C95CC8B-FD84-4DCE-A2AA-61DEE4B560DA} [DHCP-serv: 192.168.200.254, lease-time: 31536000]
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Ethernet adapter VPN Adapter:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : TAP-Windows Adapter V9
Physical Address. . . . . . . . . : 00-FF-8C-95-CC-8B
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Autoconfiguration IPv4 Address. . : 169.254.227.226(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . : 8.8.8.8
8.8.4.4
NetBIOS over Tcpip. . . . . . . . : Enabled
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Warning: route gateway is not reachable on any active network adapters: 192.168.200.1
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Initialization Sequence Completed With Errors
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Set TAP-Windows TUN subnet mode network/local/netmask = 192.168.200.0/192.168.200.2/255.255.255.0 [SUCCEEDED]
Wed Dec 02 10:05:21 2015 Notified TAP-Windows driver to set a DHCP IP/netmask of 192.168.200.2/255.255.255.0 on interface {8C95CC8B-FD84-4DCE-A2AA-61DEE4B560DA} [DHCP-serv: 192.168.200.254, lease-time: 31536000]
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Initialization Sequence Completed With Errors
I cannot find any solutions on the internet and there's no issues at all on my Windows 8 machine. Does anyone using openvpn on Windows Server have these issues?