import socket
import select

MTU = 1168
IPS = "ip1", "ip2"
TARGET = "targetip", 4444

tunnel = open("/dev/tun0", "rw")

sockets = [socket.socket(socket.AF_INET, sock.SOCK_DGRAM) for x in IPS]
for ip, s in zip(ips, sockets):
  s.bind((ip, 1))

rr = []
while True:
  r, w, _ = select.select([tunnel] + sockets, [], [])
  for fd in w:
    if fd == tunnel:
      if not rr:
        rr = list(sockets)
      rr.pop(0).sendto(TARGET, tunnel.read(MTU))
    else:
      tunnel.write(fd.recv(MTU))