I have a question about routing. I have a proxy server in my network and I would like to make it available to my pppoe clients via internal IP address. The server's address is 192.168.77.1, I made a vlan connection between the PROXY and the PPPoE Server, the devices see each other and respond to ping. A client that connects via PPPoE to a PPPoE server can ping 192.168.77.2, but cannot ping 192.168.77.1. What would I have to do to make the proxy server address respond to ping without changing the clients?

Hi,
As you didn't paste you configuration, it will be guessing, but i will try..
If you have a configured firewall, then in forwarding chain you should add a rule which will allow icmp requests from 192.168.10.0/24 to 192.168.77.1

The pppoe server has several hundred pppoe sessions, there are many different IP addresses there, I checked disabling the entire firewall on the pppoe server, but the ping still did not work. Generally, it is not about the pint itself, but about the overall availability of services on the proxy server for pppoe clients.

Check the gateway configuration on proxy server, it should be 192.168.77.2

It works, thank you.
What to do if you have 3 pppoe servers? I was thinking about CCR between PROXY and pppoe servers, but by assigning the gateway address to CCR, pppoe clients did not see the proxy address (and pppoe servers did)