diff --git a/boards/px4/fmu-v6x/init/rc.board_defaults b/boards/px4/fmu-v6x/init/rc.board_defaults
index 8338abfacb..a7d844a366 100644
--- a/boards/px4/fmu-v6x/init/rc.board_defaults
+++ b/boards/px4/fmu-v6x/init/rc.board_defaults
@@ -3,6 +3,15 @@
 # board specific defaults
 #------------------------------------------------------------------------------
 
+# Mavlink ethernet (CFG 1000)
+param set-default MAV_2_CONFIG 1000
+param set-default MAV_2_BROADCAST 1
+param set-default MAV_2_MODE 0
+param set-default MAV_2_RADIO_CTL 0
+param set-default MAV_2_RATE 100000
+param set-default MAV_2_REMOTE_PRT 14550
+param set-default MAV_2_UDP_PRT 14550
+
 param set-default SENS_EN_INA238 0
 param set-default SENS_EN_INA228 0
 param set-default SENS_EN_INA226 1
diff --git a/boards/px4/fmu-v6x/nuttx-config/nsh/defconfig b/boards/px4/fmu-v6x/nuttx-config/nsh/defconfig
index e50797b7f0..178696cc3a 100644
--- a/boards/px4/fmu-v6x/nuttx-config/nsh/defconfig
+++ b/boards/px4/fmu-v6x/nuttx-config/nsh/defconfig
@@ -120,11 +120,13 @@ CONFIG_NETUTILS_TELNETD=y
 CONFIG_NET_ARP_IPIN=y
 CONFIG_NET_ARP_SEND=y
 CONFIG_NET_BROADCAST=y
+CONFIG_NET_ETH_PKTSIZE=1518
 CONFIG_NET_ICMP=y
 CONFIG_NET_ICMP_SOCKET=y
 CONFIG_NET_SOLINGER=y
 CONFIG_NET_TCP=y
 CONFIG_NET_TCPBACKLOG=y
+CONFIG_NET_TCP_DELAYED_ACK=y
 CONFIG_NET_TCP_WRITE_BUFFERS=y
 CONFIG_NET_UDP=y
 CONFIG_NET_UDP_CHECKSUMS=y