diff --git a/boards/nxp/fmuk66-v3/nuttx-config/nsh/defconfig b/boards/nxp/fmuk66-v3/nuttx-config/nsh/defconfig
index 3780d4681e..9361e9b1b9 100644
--- a/boards/nxp/fmuk66-v3/nuttx-config/nsh/defconfig
+++ b/boards/nxp/fmuk66-v3/nuttx-config/nsh/defconfig
@@ -116,8 +116,6 @@ CONFIG_MTD=y
 CONFIG_MTD_BYTE_WRITE=y
 CONFIG_MTD_PARTITION=y
 CONFIG_MTD_RAMTRON=y
-CONFIG_NETDB_DNSCLIENT=y
-CONFIG_NETDB_DNSSERVER_NOADDR=y
 CONFIG_NETDEV_PHY_IOCTL=y
 CONFIG_NETINIT_THREAD=y
 CONFIG_NETINIT_THREAD_PRIORITY=49
@@ -155,6 +153,7 @@ CONFIG_NSH_DISABLE_UNAME=y
 CONFIG_NSH_DISABLE_WGET=y
 CONFIG_NSH_DISABLE_XD=y
 CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_IOBUFFER_SIZE=256
 CONFIG_NSH_LINELEN=128
 CONFIG_NSH_MAXARGUMENTS=15
 CONFIG_NSH_NESTDEPTH=8
@@ -162,6 +161,8 @@ CONFIG_NSH_READLINE=y
 CONFIG_NSH_ROMFSETC=y
 CONFIG_NSH_ROMFSSECTSIZE=128
 CONFIG_NSH_STRERROR=y
+CONFIG_NSH_TELNETD_CLIENTSTACKSIZE=1280
+CONFIG_NSH_TELNETD_DAEMONSTACKSIZE=1024
 CONFIG_NSH_VARS=y
 CONFIG_PIPES=y
 CONFIG_PREALLOC_TIMERS=50
@@ -201,6 +202,10 @@ CONFIG_SYSTEM_CUTERM_DEFAULT_BAUD=57600
 CONFIG_SYSTEM_NSH=y
 CONFIG_SYSTEM_PING=y
 CONFIG_TASK_NAME_SIZE=24
+CONFIG_TELNET_IOTHREAD_STACKSIZE=512
+CONFIG_TELNET_MAXLCLIENTS=1
+CONFIG_TELNET_RXBUFFER_SIZE=128
+CONFIG_TELNET_TXBUFFER_SIZE=128
 CONFIG_UART1_RXBUFSIZE=600
 CONFIG_UART1_TXBUFSIZE=1100
 CONFIG_UART4_BAUD=57600
diff --git a/boards/nxp/fmuk66-v3/nuttx-config/socketcan/defconfig b/boards/nxp/fmuk66-v3/nuttx-config/socketcan/defconfig
index 7c9d8e2b30..b0c32dd6a4 100644
--- a/boards/nxp/fmuk66-v3/nuttx-config/socketcan/defconfig
+++ b/boards/nxp/fmuk66-v3/nuttx-config/socketcan/defconfig
@@ -151,6 +151,7 @@ CONFIG_NSH_DISABLE_UNAME=y
 CONFIG_NSH_DISABLE_WGET=y
 CONFIG_NSH_DISABLE_XD=y
 CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_IOBUFFER_SIZE=256
 CONFIG_NSH_LINELEN=128
 CONFIG_NSH_MAXARGUMENTS=15
 CONFIG_NSH_NESTDEPTH=8
@@ -158,6 +159,8 @@ CONFIG_NSH_READLINE=y
 CONFIG_NSH_ROMFSETC=y
 CONFIG_NSH_ROMFSSECTSIZE=128
 CONFIG_NSH_STRERROR=y
+CONFIG_NSH_TELNETD_CLIENTSTACKSIZE=1280
+CONFIG_NSH_TELNETD_DAEMONSTACKSIZE=1024
 CONFIG_NSH_VARS=y
 CONFIG_PIPES=y
 CONFIG_PREALLOC_TIMERS=50
@@ -197,6 +200,10 @@ CONFIG_SYSTEM_CUTERM_DEFAULT_BAUD=57600
 CONFIG_SYSTEM_NSH=y
 CONFIG_SYSTEM_PING=y
 CONFIG_TASK_NAME_SIZE=24
+CONFIG_TELNET_IOTHREAD_STACKSIZE=512
+CONFIG_TELNET_MAXLCLIENTS=1
+CONFIG_TELNET_RXBUFFER_SIZE=128
+CONFIG_TELNET_TXBUFFER_SIZE=128
 CONFIG_UART1_RXBUFSIZE=600
 CONFIG_UART1_TXBUFSIZE=1100
 CONFIG_UART4_BAUD=57600