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89 posts

Master Geek


#261391 25-Nov-2019 11:58
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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.


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501 posts

Ultimate Geek


  #2360729 26-Nov-2019 00:39
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That could be a firewall issue.  Do you allow port 53 between OpenVPN on VLAN 100 and the DNS server on VLAN 99?  Do you log dropped packets in your router?  If so, check the logs to see why the DNS packets are being dropped.




89 posts

Master Geek


  #2360765 26-Nov-2019 08:54
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Managed to solve it

 

I had a management interface on the same vlan and subnet as my dns

 

For some reason when I was sending dns requests it was attempting to use that interface rather than my "inernet" interface, and was failing (not sure why as it was on the same network?)

 

Added a static route to push any requests to my dns down the other interface to be routed though the router back to my dns 


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