25 4.0.2版本 ping域名不通内外网IP通网卡link_up但是internet_down 正常联网

发布于 2024-05-21 10:13:56 浏览：397 订阅该版

以前的工程   4.0.2/显示4.0.3
程序没修改什么  之前正常运行  正常解析域名

去年某个时间发现解析不了  但是ping内外网的IP 是可以的 
网卡ifconfig显示  link_up但是internet_down  正常联网

```c
/* protocol stack implement */

#define SAL_USING_LWIP
#define SAL_USING_POSIX

/* Network interface device */

#define RT_USING_NETDEV
#define NETDEV_USING_IFCONFIG
#define NETDEV_USING_PING
#define NETDEV_USING_NETSTAT
#define NETDEV_USING_AUTO_DEFAULT
#define NETDEV_IPV4 1
#define NETDEV_IPV6 0

/* light weight TCP/IP stack */

#define RT_USING_LWIP
#define RT_USING_LWIP202
#define RT_LWIP_IGMP
#define RT_LWIP_ICMP
#define RT_LWIP_DNS
#define RT_LWIP_DHCP
#define IP_SOF_BROADCAST 1
#define IP_SOF_BROADCAST_RECV 1

/* Static IPv4 Address */

#define RT_LWIP_IPADDR "192.168.1.30"
#define RT_LWIP_GWADDR "192.168.1.1"
#define RT_LWIP_MSKADDR "255.255.255.0"
#define RT_LWIP_UDP
#define RT_LWIP_TCP
#define RT_LWIP_RAW
#define RT_MEMP_NUM_NETCONN 3
#define RT_LWIP_PBUF_NUM 6
#define RT_LWIP_RAW_PCB_NUM 2
#define RT_LWIP_UDP_PCB_NUM 1
#define RT_LWIP_TCP_PCB_NUM 2
#define RT_LWIP_TCP_SEG_NUM 30
#define RT_LWIP_TCP_SND_BUF 8196
#define RT_LWIP_TCP_WND 8196
#define RT_LWIP_TCPTHREAD_PRIORITY 10
#define RT_LWIP_TCPTHREAD_MBOX_SIZE 8
#define RT_LWIP_TCPTHREAD_STACKSIZE 1024
#define RT_LWIP_ETHTHREAD_PRIORITY 12
#define RT_LWIP_ETHTHREAD_STACKSIZE 1024
#define RT_LWIP_ETHTHREAD_MBOX_SIZE 8
#define LWIP_NETIF_STATUS_CALLBACK 1
#define LWIP_NETIF_LINK_CALLBACK 1
#define SO_REUSE 1
#define LWIP_SO_RCVTIMEO 1
#define LWIP_SO_SNDTIMEO 1
#define LWIP_SO_RCVBUF 1
#define LWIP_NETIF_LOOPBACK 0
#define RT_LWIP_USING_PING
```

如何解决？