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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.

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 192.168.20.1, for now I've abandoned no-ip and using external ip to try and connect to vpn.

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.

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.

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.

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.

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.

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 192.168.20.1, for now I've abandoned no-ip and using external ip to try and connect to vpn.

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

That's how network looks like: https://i.imgur.com/64AmsRX.png I use no-ip.com service to connect to first router, then It should allow me to connect to vpn on router 2 to access files from computer on router 1 network.

All pc's from router 1 and 2 networks have no problem with connecting to VPN.

First router is D-Link DWR-921 and it is 192.168.20.1 ip

Second router is ASUS RT-AC51U and it is 192.168.21.1 ip

For some reason first router can't acess second ones network, but second can acess first.

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.

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.