Multicast, broacast, unicast and traffic redirection in VPN?

Question

Computer networks

Hello!
There are several networks connected in vpn. Applications see only their own networks (they can find out which devices are on the network) and do not see devices on other networks, although ping and TCP / ip connections go. Having perverted after suffering with Wireshark, I realized that applications are broadcasting to the address 192.network.address.255 (network.address.255.255) (for example, 192.168.0.255) . How to make the router accept a packet with the recipient's address (for example, 192.168.0.255) and redirect it to the address 255.255.255.255 and to all networks behind VPN?! How to make the router report networks behind the VPN when receiving a packet about the composition of the network? How to make the router redirect the L2 broadcast over the L2 tunnel to the networks?! Help me please!!!

Answer 1

It is better not to make a stretched L2 domain without a clear understanding of why it is needed and what pitfalls can be. But if you really need to, then build L2 over l3 vpn yourself or buy L2VPN as a service from a provider

Answer 2

You don't seem to be very good at networking
As a result, you're misinterpreting Wireshark's findings and going the wrong way
explain three points
1.

applications do not see devices on other networks, although ping and TCP / ip connections go

what do you mean by "see"?
2.

How to make sure that when receiving a packet about the composition of the network, the router reports networks behind the VPN?

Do your applications use dynamic routing protocols?
3.

How to make the router redirect L2 broadcast over the L2 tunnel to networks?

Of course, this is a complete mess, but maybe you mean proxy arp?