diff --git a/weave b/weave
index 9d2cef4750..7a412b4928 100755
--- a/weave
+++ b/weave
@@ -298,8 +298,6 @@ DATAPATH=datapath
 BRIDGE_IFNAME=link-${BRIDGE}
 DATAPATH_IFNAME=${DATAPATH}-link
 CONTAINER_IFNAME=ethwe
-# ROUTER_HOSTNETNS_IFNAME is only used for fastdp with encryption
-ROUTER_HOSTNETNS_IFNAME=veth-weave
 PORT=${WEAVE_PORT:-6783}
 HTTP_PORT=6784
 PROXY_PORT=12375
@@ -742,27 +740,7 @@ ask_version() {
 }
 
 router_opts_fastdp() {
-    if [ -z "$WEAVE_PASSWORD" ] ; then
-        echo "--datapath $DATAPATH"
-    else
-        # When using encryption, we still do bridging on the ODP
-        # datapath, because you can 'weave launch' without encryption
-        # and then later restart the router with encryption, or vice
-        # versa.  Encryption disables the use of the fastdp Overlay,
-        # but the router could still use the fastdp Bridge to receive
-        # packets.  However, pcap has better performance when sniffing
-        # every packet.  So we pass --iface to use the pcap Bridge.
-        #
-        # Why don't we simply pass "--iface $BRIDGE".  We could,
-        # except for the fact that NetworkManager likes to down the
-        # odp $BRIDGE netdev (at least under ubuntu), and you can only
-        # use pcap on an interface that is up.  We avoid that by use
-        # pcap via a veth pair (NetworkManager leaves them alone).
-        # Having a netdev in the host netns called "ethwe" might
-        # surprise people, so it is called $ROUTER_HOSTNETNS_IFNAME
-        # instead.
-        echo "--datapath $DATAPATH --iface $ROUTER_HOSTNETNS_IFNAME"
-    fi
+    echo "--datapath $DATAPATH"
 }
 
 router_opts_bridge() {
@@ -778,15 +756,7 @@ router_opts_bridged_fastdp() {
 ######################################################################
 
 setup_router_iface_fastdp() {
-    if [ -n "$WEAVE_PASSWORD" ] ; then
-        # See router_opts_fastdp
-        # No-op if already attached
-        if ip link show $LOCAL_IFNAME >/dev/null 2>&1 ; then
-            return 0
-        fi
-        connect_container_to_bridge $ROUTER_HOSTNETNS_IFNAME &&
-            ip link set $ROUTER_HOSTNETNS_IFNAME up
-    fi
+    true
 }
 
 setup_router_iface_bridge() {
@@ -1581,8 +1551,6 @@ launch_router() {
     if [ "$BRIDGE_TYPE" != bridge ] ; then
         NETHOST_OPT="--net=host"
         HTTP_IP=127.0.0.1
-        # In case there is a lingering veth-weave netdev
-        ip link del $ROUTER_HOSTNETNS_IFNAME >/dev/null 2>&1 || true
     fi
 
     # Set WEAVE_DOCKER_ARGS in the environment in order to supply
@@ -1635,10 +1603,6 @@ attach_router() {
 stop_router() {
     stop $CONTAINER_NAME "Weave"
     conntrack -D -p udp --dport $PORT >/dev/null 2>&1 || true
-    # Remove the veth-weave netdev in a fastdp context
-    if detect_bridge_type && [ "$BRIDGE_TYPE" != bridge ] ; then
-        ip link del $ROUTER_HOSTNETNS_IFNAME >/dev/null 2>&1 || true
-    fi
 }
 
 launch_proxy() {