Posted about this a while ago, but have done more testing and gotten a few things working, so re-posting to see if I can get help again

I have a openvpn server running at home, clients can connect fine, and can get out to the internet / internal network servers (web server)

However when I put my Local DNS server as the DNS for the VPN clients, it fails.

Iv tried to do a tracert from a vpn client to the server and it times out at the VPN server
where a tracert from my client to a web server goes though fine.

Im a little lost as to whats going on now, so any help would be appreciated.

Network setup

Vlan 99 - DNS 192.168.99.40
Vlan 100 - VPN 10.10.100.2

VPN Tunnel 10.10.101.1 

Vlan 4 - Web Server 192.168.4.200

C:\Users\user>tracert 192.168.4.200
Tracing route to 192.168.4.200 over a maximum of 30 hops
  1    36 ms    21 ms    27 ms  10.10.101.1
  2    23 ms    25 ms    23 ms  10.10.100.1
  3    24 ms    25 ms    22 ms  192.168.4.200

C:\Users\user>tracert 192.168.99.40
Tracing route to 192.168.99.40 over a maximum of 30 hops
  1    22 ms    22 ms    22 ms  10.10.101.1
  2     *        *        *     Request timed out.
........
 30    *        *        *     Request timed out.