# ---
# - Prevent bridged traffic getting pushed through the host's iptables rules
# ---
$ipt -A FORWARD -m physdev --physdev-is-bridged -j ACCEPT

# - Note: Maybe youe have also to activate forwarding
# -
# - IPv4:
# -    echo 1 > /proc/sys/net/ipv4/ip_forward
# -
# - IPv6:
# -    echo 1 > /proc/sys/net/ipv6/conf/all/forwarding