diff --git a/group_vars/all/vars.yml b/group_vars/all/vars.yml
index af75f398..3cecde33 100644
--- a/group_vars/all/vars.yml
+++ b/group_vars/all/vars.yml
@@ -6,3 +6,4 @@ site_domain:          'bremen.freifunk.net'
 site_vpn_prefix:      'vpn'
 icvpn_as:             65196
 fastd_peers_limit:    200
+batman_routing_algo:  'BATMAN_V'
diff --git a/roles/batman-adv-interface/defaults/main.yml b/roles/batman-adv-interface/defaults/main.yml
index ce1b3d65..f79ee27a 100644
--- a/roles/batman-adv-interface/defaults/main.yml
+++ b/roles/batman-adv-interface/defaults/main.yml
@@ -3,3 +3,4 @@ batman_interface: bat-{{ site_code }}
 batman_dummy_interface: 'bat-{{ site_code }}-dummy'
 batman_hop_penalty: 96
 batman_gateway: false
+batman_routing_algo: 'BATMAN_IV'
diff --git a/roles/batman-adv-interface/files/if-pre-up b/roles/batman-adv-interface/files/if-pre-up
index 396a89a4..9715e38b 100755
--- a/roles/batman-adv-interface/files/if-pre-up
+++ b/roles/batman-adv-interface/files/if-pre-up
@@ -21,6 +21,12 @@ case "$IF_BATADV_PORTS" in
     ;;
 esac
 
+# taken from openWRT:
+# https://git.openwrt.org/?p=feed/routing.git;a=blob;f=batman-adv/files/lib/netifd/proto/batadv.sh;h=edc14f4cbd5485ede408e897fada8eae6f8f09d3;hb=ecb7132f014275a9fa0509e790257f0a66802a1d#l72
+# maybe following is possible after create:
+# batctl meshif "$IFACE" routing_algo "${IF_BATADV_ROUTING_ALGO:-BATMAN_IV}"
+batctl routing_algo "${IF_BATADV_ROUTING_ALGO:-BATMAN_IV}"
+
 if ! batctl meshif "$IFACE" interface >/dev/null 2>&1; then
     batctl meshif "$IFACE" interface create
 fi
diff --git a/roles/batman-adv-interface/templates/interfaces b/roles/batman-adv-interface/templates/interfaces
index 6d8a5dd5..1231444d 100644
--- a/roles/batman-adv-interface/templates/interfaces
+++ b/roles/batman-adv-interface/templates/interfaces
@@ -4,12 +4,18 @@ auto {{ batman_dummy_interface }}
 iface {{ batman_dummy_interface }} inet manual
 	pre-up ip link add name $IFACE type dummy
 	up ip link set $IFACE up
+{% if batman_routing_algo == 'BATMAN_V' %}
+	# let batman handle the multicast
+	# https://gluon.readthedocs.io/en/latest/package/gluon-mesh-batman-adv.html
+	post-up bash -c 'echo 2 > /sys/class/net/{{ batman_dummy_interface }}/brport/multicast_router'
+{% endif %}
 	down ip link set $IFACE down
 	post-down ip link del $IFACE
 
 auto {{ batman_interface }}
 iface {{ batman_interface }} inet manual
 	batadv-ports {{ batman_dummy_interface }}
+	batadv-routing-algo {{ batman_routing_algo }}
 {% if ansible_default_ipv6.macaddress is defined %}
 	batadv-hw {{ ansible_default_ipv6.macaddress | derive_mac_addr(2) }}
 {% else %}
diff --git a/roles/main-bridge/templates/interfaces b/roles/main-bridge/templates/interfaces
index 51efe5d4..2e2ff2c3 100644
--- a/roles/main-bridge/templates/interfaces
+++ b/roles/main-bridge/templates/interfaces
@@ -25,7 +25,12 @@ iface br-{{ site_code }} inet static
 	# tune ARP and IPv6 neighbor soolicitation
 	post-up sysctl -p /etc/sysctl.d/main-bridge-ip-neigh-tuning.conf
 	# increase multicast table
-	post-up bash -c 'echo 2048 > /sys/class/net/br-ffhb/bridge/hash_max'
+{% if batman_routing_algo is defined and batman_routing_algo == 'BATMAN_V' %}
+	# let batman handle the multicast
+	# https://gluon.readthedocs.io/en/latest/package/gluon-mesh-batman-adv.html
+	post-up bash -c 'echo 2 > /sys/class/net/br-{{ site_code }}/brport/multicast_router'
+{% endif %}
+	post-up bash -c 'echo 2048 > /sys/class/net/br-{{ site_code }}/bridge/hash_max'
 
 iface br-{{ site_code }} inet6 static
 	address {{ batman_ipv6_local.address }}