Nick Howitt wrote:

Your system is out of date. If you have automatic updates enabled, see this sticky, but if your firewall is really disabled on #2 then you have a networking problem with #2 as it is either not responding or the responses are going elsewhere.

That's why I don't see the Additional Settings. I update. Now I toggle on "Enable NAT (Gateway mode only)" it's working fine now. Thanks Nick.

Your system is out of date. If you have automatic updates enabled, see this sticky, but if your firewall is really disabled on #2 then you have a networking problem with #2 as it is either not responding or the responses are going elsewhere.

Nick Howitt wrote:

So the problem is not ClearOS. 10.210.1.3 is not replying. Are you sure its firewall is stopped? Alternatively, you could try enabling "Enable NAT (Gateway mode only)" in the OpenVPN app.

Yes I already turn off the firewall on both device.

I don't see settings that enable NAT (Gateway mode only)

Nick Howitt wrote:

So the answer is that you are connecting from 192.168.1.4/255.255.255.0.

In ssh, please run:

tcpdump -nni enp2s0 '(icmp and host computer_#2_IP)'

Then try pinging #2 from #1. ctrl+c to terminate the logging.

If you are using PuTTy to access ClearOS by SSH, you can copy from it just by selecting the text and paste into it by right-clicking. Please put any results inside "code" tags (the piece of paper icon with a <> on it)

tcpdump -nni enp2s0 '(icmp and host 10.210.1.3)'

tcpdump: verbose output suppressed, use -v or -vv for full protocol decode

listening on enp2s0, link-type EN10MB (Ethernet), capture size 262144 bytes

19:56:34.419975 IP 10.8.0.6 > 10.210.1.3: ICMP echo request, id 1, seq 28, length 40

19:56:39.419143 IP 10.8.0.6 > 10.210.1.3: ICMP echo request, id 1, seq 29, length 40

19:56:44.415959 IP 10.8.0.6 > 10.210.1.3: ICMP echo request, id 1, seq 30, length 40

19:56:49.418544 IP 10.8.0.6 > 10.210.1.3: ICMP echo request, id 1, seq 31, length 40

19:56:54.416566 IP 10.8.0.6 > 10.210.1.3: ICMP echo request, id 1, seq 32, length 40

5 packets captured

9 packets received by filter

0 packets dropped by kernel

So the answer is that you are connecting from 192.168.1.4/255.255.255.0.

In ssh, please run:

tcpdump -nni enp2s0 '(icmp and host computer_#2_IP)'

Then try pinging #2 from #1. ctrl+c to terminate the logging.

If you are using PuTTy to access ClearOS by SSH, you can copy from it just by selecting the text and paste into it by right-clicking. Please put any results inside "code" tags (the piece of paper icon with a <> on it)

Nick Howitt wrote:

I am confused as to how you are connecting. Is #1 on the WAN interface subnet or is it fully external, so out on the internet? I wanted to know what LAN subnet its normal interface is connected to when external to ClearOS and not the subnet mask. Perhaps just give the output from "ipconfig" from the PC.

Sorry I'm quite lost where to look for the correct settings.

See the attachment for the ipconfig on my home computer.

I am confused as to how you are connecting. Is #1 on the WAN interface subnet or is it fully external, so out on the internet? I wanted to know what LAN subnet its normal interface is connected to when external to ClearOS and not the subnet mask. Perhaps just give the output from "ipconfig" from the PC.

Nick Howitt wrote:

What is your ClearOS LAN subnet? What is the LAN subnet of #1. I assume it is physically external to your LAN?

ClearOS - 255.255.255.0
Computer #1 - 255.255.255.252 (TAP Adapter)

Yes it's external.

What is your ClearOS LAN subnet? What is the LAN subnet of #1. I assume it is physically external to your LAN?