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the problem is that I can't connect to VPN through the internet connection, but it works on the local network.

I use no-ip.com service to connect to the first router, then It should allow me to connect to VPN on router 2 to access files from a computer on router 1 network.

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All PCs from router 1 and 2 networks have no problem with connecting to VPN.

The first router is D-Link DWR-921 and it is 192.168.20.1 IP

The second router is ASUS RT-AC51U and it is 192.168.21.1 IP

For some reason, the first router can't access the second network, but second can access first.

EDIT:

Computer I want to connect to ip is: 192.168.20.3 and mask is 255.255.255.0, for now I've abandoned no-ip and using external ip to try and connect to vpn.

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  • Please edit your question to include the IP of the computer you're trying to connect to and the subnet masks. What sort of connection are you making using no-IP to the first router?
    – I say Reinstate Monica
    Commented Feb 21, 2018 at 14:15
  • Allright, but still I think I need to have forwarding.
    – Aksebkit
    Commented Feb 21, 2018 at 14:20
  • Why such a complicated infrastructure for such a small network?
    – Kinnectus
    Commented Feb 21, 2018 at 14:23
  • You see, first router have backup LTE support, but no VPN and second is other way arround.
    – Aksebkit
    Commented Feb 21, 2018 at 14:24
  • which one oh these is the VPN server ????
    – Raouf M. Bencheraiet
    Commented Feb 21, 2018 at 22:01

2 Answers 2

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Router one will have an Inside Network and Outside Network. Make sure you have ports open on Router 1 to allow access from Outside (connected to Router 2) back to Inside (connected to PC1).

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  • 1
    Allright, I try to set this up, but what ports are needed and how to set them here: i.imgur.com/TrOiQer.png
    – Aksebkit
    Commented Feb 21, 2018 at 14:21
  • Depends on how are you connecting to PC1. If it is rdp, than port 3389 and so on.
    – Abu Zaid
    Commented Feb 21, 2018 at 17:11
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The reason the 2nd router can access the first subnet but not vice-versa is because of double nating.

On router 2 set it's local address to the range of the first, something like 192.168.20.254. then in router 2 disable DHCP, disable firewall/spi, disable the WAN, and make sure your connecting router 2 from the lan ports, to the lan ports of router one.

You should now be able to communicate in both directions no problem.

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