I use python socket module to simulate a pppoe server, but how to generate the ppp0 interface?

Question

I use python socket module to simulate a pppoe server, the server can receive ppp connection packet from client such as PADI/PADR/LCP Request... , however after the connection finished,there is no ppp0 interface on sever. I wish the ppp0 interface can be up automatically after the ppp connection finished ,please help...

import socket

def main():
    server_socket = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.ntohs(0x8863))

    interface ='eth0'

    server_socket.bind((interface, 0))

    while True:
        try:
            data, addr = server_socket.recvfrom(4096)
            '''
            handle pppoe packets here and finish the pppoe connection
            '''

        except KeyboardInterrupt:
            break

    server_socket.close()

if __name__ == "__main__":
    main()

My OS is ubuntu 18.04..

I expect that after the ppp connection between client and server finished, there should be a ppp0 interface on my server.

For example server IP is 20.20.20.1 and the client get IP 20.20.20.2 ,I wish the interface on server should be like:

ppp0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST>  mtu 1492
        inet 20.20.20.1  netmask 255.255.255.255  destination 20.20.20.2
        ppp  txqueuelen 3  (Point-to-Point Protocol)
        RX packets 194  bytes 14365 (14.3 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 175  bytes 13081 (13.0 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Anyone have some ideas? Thanks...

Answer 1

The OS handle Virtual interfaces.

According to OS you are using, you should read manuals about it.

For example in linux you can use networkd or ip command to make a new virtual interface.

You can use these commands:

ip link add name MYNEWINTERFACE type dummy
ifconfig MYNEWINTERFACE up

Check other options with:

man ip-link