diff --git a/configs/sim/sixlowpan/defconfig b/configs/sim/sixlowpan/defconfig
index b488fdc372..87a2b5a794 100644
--- a/configs/sim/sixlowpan/defconfig
+++ b/configs/sim/sixlowpan/defconfig
@@ -897,9 +897,8 @@ CONFIG_EXAMPLES_NETTEST=y
 CONFIG_EXAMPLES_NETTEST_STACKSIZE1=4096
 CONFIG_EXAMPLES_NETTEST_PRIORITY1=100
 CONFIG_EXAMPLES_NETTEST_LOOPBACK=y
-# CONFIG_EXAMPLES_NETTEST_TARGET2 is not set
-CONFIG_EXAMPLES_NETTEST_DAEMON_STACKSIZE=2048
-CONFIG_EXAMPLES_NETTEST_DEAMON_PRIORITY=100
+CONFIG_EXAMPLES_NETTEST_DAEMON_STACKSIZE=4096
+CONFIG_EXAMPLES_NETTEST_DAEMON_PRIORITY=100
 CONFIG_EXAMPLES_NETTEST_DEVNAME="eth0"
 # CONFIG_EXAMPLES_NETTEST_PERFORMANCE is not set
 CONFIG_EXAMPLES_NETTEST_IPv6=y
@@ -909,7 +908,7 @@ CONFIG_EXAMPLES_NETTEST_IPv6=y
 #
 
 #
-# Client IPv6 address
+# Server IPv6 address
 #
 CONFIG_EXAMPLES_NETTEST_SERVERIPv6ADDR_1=0xfc00
 CONFIG_EXAMPLES_NETTEST_SERVERIPv6ADDR_2=0x0000
@@ -1169,13 +1168,7 @@ CONFIG_NSH_MAX_ROUNDTRIP=20
 # CONFIG_SYSTEM_FREE is not set
 # CONFIG_SYSTEM_HEX2BIN is not set
 # CONFIG_SYSTEM_HEXED is not set
-CONFIG_SYSTEM_I2CTOOL=y
-CONFIG_I2CTOOL_MINBUS=0
-CONFIG_I2CTOOL_MAXBUS=0
-CONFIG_I2CTOOL_MINADDR=0x03
-CONFIG_I2CTOOL_MAXADDR=0x77
-CONFIG_I2CTOOL_MAXREGADDR=0xff
-CONFIG_I2CTOOL_DEFFREQ=400000
+# CONFIG_SYSTEM_I2CTOOL is not set
 # CONFIG_SYSTEM_INSTALL is not set
 # CONFIG_SYSTEM_MDIO is not set
 # CONFIG_SYSTEM_NETDB is not set