# Create tunnel A
sshuttle -r $SERVER_A $NETMASK_A --daemon --pidfile=$PIDFILE_A
# Create tunnel B
sshuttle -r $SERVER_B $NETMASK_B --daemon --pidfile=$PIDFILE_B

# Do stuff ...

# Shutdown tunnel B
kill $(cat ${PIDFILE_B})
# Shutdown tunnel A
kill $(cat ${PIDFILE_A})

sshuttle[15918]: c : exiting on signal 15
sshuttle[15922]: fw: undoing changes.
sshuttle[16023]: c : exiting on signal 15
sshuttle[15922]: Another app is currently holding the xtables lock. Perhaps you want to use the -w option?
sshuttle[15922]: fw: Error trying to undo IPv4 firewall.
sshuttle[15922]: fw: Traceback (most recent call last):
sshuttle[15922]:       File "/home/patrick/src/tmp/sshuttle/sshuttle/linux.py", line 22, in ipt_chain_exists
sshuttle[15922]:         output = ssubprocess.check_output(argv, env=get_env())
sshuttle[15922]:       File "/usr/lib/python3.8/subprocess.py", line 411, in check_output
sshuttle[15922]:         return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
sshuttle[15922]:       File "/usr/lib/python3.8/subprocess.py", line 512, in run
sshuttle[15922]:         raise CalledProcessError(retcode, process.args,
sshuttle[15922]:     subprocess.CalledProcessError: Command '['iptables', '-t', 'nat', '-nL']' returned non-zero exit status 4.
sshuttle[15922]:
sshuttle[15922]:     During handling of the above exception, another exception occurred:
sshuttle[15922]:
sshuttle[15922]:     Traceback (most recent call last):
sshuttle[15922]:       File "/home/patrick/src/tmp/sshuttle/sshuttle/firewall.py", line 274, in main
sshuttle[15922]:         method.restore_firewall(port_v4, socket.AF_INET, udp, user)
sshuttle[15922]:       File "/home/patrick/src/tmp/sshuttle/sshuttle/methods/nat.py", line 111, in restore_firewall
sshuttle[15922]:         if ipt_chain_exists(family, table, chain):
sshuttle[15922]:       File "/home/patrick/src/tmp/sshuttle/sshuttle/linux.py", line 27, in ipt_chain_exists
sshuttle[15922]:         raise Fatal('%r returned %d' % (argv, e.returncode))
sshuttle[15922]:     sshuttle.helpers.Fatal: ['iptables', '-t', 'nat', '-nL'] returned 4
sshuttle[15918]: c : SW#8:192.168.111.48:54944: deleting (3 remain)
sshuttle[15918]: c : SW'unknown':Mux#1: deleting (2 remain)
sshuttle[15918]: c : SW'unknown':Mux#2: deleting (1 remain)
sshuttle[15918]: c : SW#10:192.168.111.48:54946: deleting (0 remain)
sshuttle[16023]: client_loop: send disconnect: Broken pipe