pytun_tun_interface_setup_with_ip_config_and_packet_read.py

1from pytun import TunTapDevice, IFF_TUN, IFF_NO_PI
2
3# Create a TUN device
4# IFF_TUN: Tunnel device (IP packets)
5# IFF_NO_PI: Do not provide packet information (header)
6tun = TunTapDevice(name="tun0", flags=(IFF_TUN | IFF_NO_PI))
7
8# Configure the interface
9tun.addr = '10.8.0.1'
10tun.netmask = '255.255.255.0'
11tun.mtu = 1500
12
13# Bring the interface up
14tun.up()
15
16print(f"Interface {tun.name} is up at {tun.addr}")
17
18try:
19    while True:
20        # Read a packet from the virtual interface
21        buf = tun.read(tun.mtu)
22        if not buf:
23            break
24        
25        # In a real application, you would process or forward the packet here
26        print(f"Received {len(buf)} bytes from {tun.name}")
27        
28        # Example: Write the packet back (echo)
29        # tun.write(buf)
30except KeyboardInterrupt:
31    print("Stopping...")
32finally:
33    tun.down()
34    tun.close()