Layer 2 Bridging with zerotier

bridge-zerotier.sh

#!/bin/bash
# doc: https://zerotier.atlassian.net/servicedesk/customer/portal/1/article/7471125
LOGGING_FILE='/var/log/zt-bridge.log'
LAN_INT='eth3'
BR_INT='br0'
ZT_INT='ztwdjesw7o'

BRIDGE_IP='172.28.10.5/16'
#GATEWAY_IP='192.168.3.5'

SLEEP_TIMER='15s'
#Delay Timer to give the system a chance to finish booting
sleep $SLEEP_TIMER

echo 'find zt tap devices'
zt=$(ip -d tuntap show|grep -B 1 'zerotier-one')
ZT_INT=$(echo $zt|egrep -oh '^(\w+)')
echo 'zt tap device is: '$ZT_INT >> $LOGGING_FILE

#Disable Interfaces, Remove IP addresses
echo 'Disabling Interface' >> $LOGGING_FILE
/sbin/ip link set $LAN_INT down >> $LOGGING_FILE
/sbin/ip link set $ZT_INT down >> $LOGGING_FILE
/sbin/ip addr flush dev $LAN_INT >> $LOGGING_FILE
/sbin/ip addr flush dev $ZT_INT >> $LOGGING_FILE

echo 'Setting up Bridging...' >> $LOGGING_FILE
/sbin/brctl addbr $BR_INT >> $LOGGING_FILE
/sbin/brctl addif $BR_INT $ZT_INT $LAN_INT >> $LOGGING_FILE

/sbin/ip link set $LAN_INT promisc on up >> $LOGGING_FILE
/sbin/ip link set $ZT_INT promisc on up >> $LOGGING_FILE
/sbin/ip link set $BR_INT up >> $LOGGING_FILE

/sbin/ip addr add $BRIDGE_IP dev $BR_INT >> $LOGGING_FILE
#/sbin/route add default gateway $GATEWAY_IP
echo 'Finished!' >> $LOGGING_FILE