UDP 广播发包失败

UDP 广播发不出去

1.防火墙

不解释了

2.没有默认网关

route add default gw 192.168.2.1

3.

增加广播地址

route add 255.255.255.255 dev eth0

4.设置套接字选项

const int opt = 1;

int nb = 0;

nb = setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&opt, sizeof(opt));