基于LwIP实现在一个网口上同时支持IPv6+IPv4通信

本文基于恩智浦的i.MX RT1170 EVK及SDK，讨论如何在一个以太网口上同时实现IPv6和IPv4通信。


测试环境：
SDK：2.10.1
IDE: MCUXpresso 11.4.0
EVK: i.MX RT1170
PC: Windows10

1. 实现步骤
1、下载i.MX RT1170 SDK 2.10.1导入lwip_udpecho_bm_cm7工程到MCUXpresso。
2、在lwipopts.h文件中, 参考本文提供的代码链接, 添加以下代码：

1. #define LWIP_IPV6 1

复制代码

3、在lwip_udpecho_bm.c文件中, 参考本文提供的代码链接，添加以下代码：

1. ip6_addr_t ipaddr_v6;
2. s8_t chosen_idx;
3. // IPv6
4. IP6_ADDR(&ipaddr_v6,PP_HTONL(0xFE800000),PP_HTONL(0x0),PP_HTONL(0x3DD79303),PP_HTONL(0x126c0df0));
5. netif_add_ip6_address(&netif, &ipaddr_v6, &chosen_idx);
6. netif.ip6_addr_state[chosen_idx] = IP6_ADDR_VALID;
7. ip6_addr_assign_zone(ip_2_ip6(&netif.ip6_addr[0]), IP6_UNICAST, &netif);
8. netif_ip6_addr_set_state(&netif, 0, IP6_ADDR_TENTATIVE);

复制代码

4、编译并下载到目标板运行。
5、参考下图用网线连接PC机和目标板。

<ignore_js_op>

6、ICMP测试
打开CMD窗口，参照下面的log分别进行IPv6和IPv4的测试。

1. C:\Users\nxa16038>ping 192.168.0.102
2. Pinging 192.168.0.102 with 32 bytes of data:
3. Reply from 192.168.0.102: bytes=32 time=2ms TTL=255
4. Reply from 192.168.0.102: bytes=32 time=1ms TTL=255
5. Reply from 192.168.0.102: bytes=32 time=1ms TTL=255
6. Reply from 192.168.0.102: bytes=32 time=1ms TTL=255
7. Ping statistics for 192.168.0.102:
8.     Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
9. Approximate round trip times in milli-seconds:
10.     Minimum = 1ms, Maximum = 2ms, Average = 1ms
12. C:\Users\nxa16038>ping -6 FE80::3DD7:9303:126c:0df0
13. Pinging fe80::3dd7:9303:126c:df0 with 32 bytes of data:
14. Reply from fe80::3dd7:9303:126c:df0: time=1ms
15. Reply from fe80::3dd7:9303:126c:df0: time=1ms
16. Reply from fe80::3dd7:9303:126c:df0: time=1ms
17. Reply from fe80::3dd7:9303:126c:df0: time=2ms
18. Ping statistics for fe80::3dd7:9303:126c:df0:
19.     Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
20. Approximate round trip times in milli-seconds:
21.     Minimum = 1ms, Maximum = 2ms, Average = 1ms

复制代码

7、UDP测试


UDP测试需要使用相关的工具，在本文提供的代码链接中附带了此工具，测试命令和log如下所示：

1. C:\Users\nxa16038\Desktop\tt2\udp_test_tool\x64\Debug>udp_test.exe -6 FE80::3DD7:9303:126c:df0 7 5001 test_string_12345
2. Build date and time: Oct 22 2021, 18:50:48
3. arc = 6
4. arg[0] = udp_test.exe
5. arg[1] = -6
6. arg[2] = FE80::3DD7:9303:126c:df0
7. arg[3] = 7
8. arg[4] = 5001
9. arg[5] = test_string_12345
10. Send ok.
11. Receiving...
12. Get connection.
13. Get string: test_string_12345
14. Remote addr: fe80:0000:0000:0000:3dd7:9303:126c:0df0
16. C:\Users\nxa16038\Desktop\tt2\udp_test_tool\x64\Debug>udp_test.exe -4 192.168.0.102 7 5001 test_string_12345
17. Build date and time: Oct 22 2021, 18:50:48
18. arc = 6
19. arg[0] = udp_test.exe
20. arg[1] = -4
21. arg[2] = 192.168.0.102
22. arg[3] = 7
23. arg[4] = 5001
24. arg[5] = test_string_12345
25. Send ok.
26. Receiving...
27. Get connection.
28. Get string: test_string_12345, len = 17
29. Remote addr: 192.168.0.102

复制代码

2. 获取源代码
本文的原代码可以从github.com进行下载，无需密码，下载链接为：
https://github.com/jiaguonxpcom/lwip_ipv6_ipv4
该代码编译后可以直接下载到i.MX RT1170 EVK运行。