enableBridgeNetfilter = do 
    spawnShell "echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables"
    spawnShell "echo 1 > /proc/sys/net/bridge/bridge-nf-call-ip6tables"
    spawnShell "echo 1 > /proc/sys/net/bridge/bridge-nf-call-arptables"
    logAndExecuteIptables $ printf "-t nat -I POSTROUTING -m physdev --physdev-is-bridge -j ACCEPT"
enableBridgeNetfilter = do 
    spawnShell "echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables"
    spawnShell "echo 1 > /proc/sys/net/bridge/bridge-nf-call-ip6tables"
    spawnShell "echo 1 > /proc/sys/net/bridge/bridge-nf-call-arptables"
    logAndExecuteIptables $ printf "-t nat -I POSTROUTING -m physdev --physdev-is-bridge -j ACCEPT"
enableBridgeNetfilter = do 
    spawnShell "echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables"
    spawnShell "echo 1 > /proc/sys/net/bridge/bridge-nf-call-ip6tables"
    spawnShell "echo 1 > /proc/sys/net/bridge/bridge-nf-call-arptables"
    logAndExecuteIptables $ printf "-t nat -I POSTROUTING -m physdev --physdev-is-bridge -j ACCEPT"