rtl8102e linux

auto eth0
iface eth0 inet static
    address 192.168.1.100
    netmask 255.255.255.0
    gateway 192.168.1.1

sudo systemctl restart networking

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/if.h>
#include <linux/if_ether.h>

int main() {
    int sockfd;
    struct sockaddr_in dest_addr;
    struct ifreq ifr;
    char buffer[ETH_FRAME_LEN];

    sockfd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
    if (sockfd < 0) {
        perror("socket");
        return -1;
    }

    strncpy(ifr.ifr_name, "eth0", IFNAMSIZ);
    ioctl(sockfd, SIOCGIFINDEX, &ifr);

    memset(&dest_addr, 0, sizeof(dest_addr));
    dest_addr.sll_family = AF_PACKET;
    dest_addr.sll_protocol = htons(ETH_P_ALL);
    dest_addr.sll_ifindex = ifr.ifr_ifindex;

    // 发送和接收数据的代码...

    close(sockfd);
    return 0;
}

gcc -o eth_test eth_test.c -lsocket
sudo ./eth_test