Switch off IPv6

Author: Jason2866

configs/defconfig.common

@@ -95,8 +95,8 @@ CONFIG_LWIP_TCP_MSL=6000
 CONFIG_LWIP_TCP_FIN_WAIT_TIMEOUT=2000
 CONFIG_LWIP_TCPIP_TASK_STACK_SIZE=2560
 CONFIG_LWIP_TCPIP_TASK_AFFINITY_CPU0=y
-CONFIG_LWIP_IPV6_AUTOCONFIG=y
-CONFIG_LWIP_IPV6_RDNSS_MAX_DNS_SERVERS=2
+# CONFIG_LWIP_IPV6 is not set
+# CONFIG_LWIP_IPV6_AUTOCONFIG is not set
 CONFIG_LWIP_MAX_SOCKETS=16
 CONFIG_LWIP_DHCP_RESTORE_LAST_IP=n
 CONFIG_LWIP_DHCP_OPTIONS_LEN=128