diff --git a/router/net_task_thread.c b/router/net_task_thread.c
index 47b9d27..5a36577 100644
--- a/router/net_task_thread.c
+++ b/router/net_task_thread.c
@@ -8,8 +8,9 @@ void *net_task(void *arg)
     char *dev2 = "ens38"; // 第二个网卡
 
     // 打开网卡设备
-    open_device(&device1, dev1);
-    open_device(&device2, dev2);
+    // libnet_context1 使用 open_device 函数打开网卡设备1 后返回的 libnet 上下文
+    libnet_context1 = open_device(&device1, dev1);
+    libnet_context2 = open_device(&device2, dev2);
 
     // 开始捕获数据包:
     // pcap_loop: 网卡设备、捕获的数据包个数、回调函数、传递给回调函数的参数
@@ -20,7 +21,8 @@ void *net_task(void *arg)
 }
 
 // 打开网卡设备
-void open_device(pcap_t **device, char *dev_name)
+// 如果成功打开网卡设备，就返回 libnet 上下文
+libnet_t *open_device(pcap_t **device, char *dev_name)
 {
     // 打开网卡设备: 设备名、最大字节数、混杂模式、超时时间、错误信息缓冲区
     *device = pcap_open_live(dev_name, MAX_BYTE, 1, 512, errbuf);
@@ -31,16 +33,124 @@ void open_device(pcap_t **device, char *dev_name)
     }
 
     // 处理数据包
-    libnet_context1 = libnet_init(LIBNET_LINK, dev_name, errbuf); // 初始化 libnet
-    if (libnet_context1 == NULL)
+    libnet_t *libnet = libnet_init(LIBNET_LINK, dev_name, errbuf); // 初始化 libnet
+    if (libnet == NULL)
     {
         perror("libnet_init");
         exit(-1);
     }
+
+    return libnet; // 返回 libnet 上下文
 }
 
 // 处理数据包
+// 参数: 传递给回调函数的参数、数据包头部、数据包
 void process_packet(u_char *arg, const struct pcap_pkthdr *pkthdr, const u_char *packet)
 {
+    // 将数据包从一个网卡发送到另一个网卡
+    // 实际路由中，需要根据路由表进行路由选择
+
     printf("process_packet\n");
+    /* 
+    libnet_ptag_t t;  // libnet 标签: 用于标识数据包中的某一部分
+    libnet_t *libnet; // libnet 上下文: 用于发送数据包
+
+    // 根据网卡设备选择 libnet 上下文，以便发送数据包
+    // 规则是: 如果是从网卡1接收到的数据包，就从网卡2发送出去
+    if (arg == (u_char *)device1)
+    {
+        libnet = libnet_context2;
+    }
+    else if (arg == (u_char *)device2)
+    {
+        libnet = libnet_context1;
+    }
+
+    t = libnet_build_ethernet(
+        ((struct libnet_ethernet_hdr *)packet)->ether_dhost, // 目的MAC地址
+        ((struct libnet_ethernet_hdr *)packet)->ether_shost, // 源MAC地址
+        ((struct libnet_ethernet_hdr *)packet)->ether_type,  // 以太网类型
+        packet + LIBNET_ETH_H,                               // 负载数据(携带的数据)
+        pkthdr->len - LIBNET_ETH_H,                          // 以太网数据包的数据部分
+        libnet,                                              // libnet 上下文
+        0                                                    // 标记
+    );
+
+    if (t == -1)
+    {
+        perror("libnet_build_ethernet");
+        exit(-1);
+    }
+
+    // 发送数据包
+    int res = libnet_write(libnet);
+    if (res == -1)
+    {
+        perror("libnet_write");
+        exit(-1);
+    } */
+
+    struct libnet_ethernet_hdr *eth_hdr = (struct libnet_ethernet_hdr *)packet;
+
+    // 如果是IP数据包，就打印源IP地址和目的IP地址
+    if (ntohs(eth_hdr->ether_type) == ETHERTYPE_IP)
+    {
+        struct libnet_ipv4_hdr *ip_hdr = (struct libnet_ipv4_hdr *)(packet + LIBNET_ETH_H);
+        if (ip_hdr->ip_p == IPPROTO_TCP)
+        {
+            struct libnet_tcp_hdr *tcp_hdr = (struct libnet_tcp_hdr *)(packet + LIBNET_ETH_H + LIBNET_IPV4_H);
+            printf("TCP: %s:%d -> %s:%d\n", inet_ntoa(ip_hdr->ip_src), ntohs(tcp_hdr->th_sport), inet_ntoa(ip_hdr->ip_dst), ntohs(tcp_hdr->th_dport));
+        }
+        else if (ip_hdr->ip_p == IPPROTO_UDP)
+        {
+            struct libnet_udp_hdr *udp_hdr = (struct libnet_udp_hdr *)(packet + LIBNET_ETH_H + LIBNET_IPV4_H);
+            printf("UDP: %s:%d -> %s:%d\n", inet_ntoa(ip_hdr->ip_src), ntohs(udp_hdr->uh_sport), inet_ntoa(ip_hdr->ip_dst), ntohs(udp_hdr->uh_dport));
+        }
+
+        libnet_t *libnet;
+        if (arg == (u_char *)device1)
+        {
+            libnet = libnet_context2;
+        }
+        else if (arg == (u_char *)device2)
+        {
+            libnet = libnet_context1;
+        }
+
+        libnet_ptag_t t = libnet_build_ethernet(
+            eth_hdr->ether_dhost,
+            eth_hdr->ether_shost,
+            ETHERTYPE_IP,
+            packet + LIBNET_ETH_H,
+            pkthdr->len - LIBNET_ETH_H,
+            libnet,
+            0);
+
+        if (t == -1)
+        {
+            perror("libnet_build_ethernet");
+            exit(-1);
+        }
+
+        int res = libnet_write(libnet);
+        if (res == -1)
+        {
+            perror("libnet_write");
+            exit(-1);
+        }
+    }
+
+    // 如果是ARP数据包，就打印源IP地址和目的IP地址
+    if (ntohs(eth_hdr->ether_type) == ETHERTYPE_ARP)
+    {
+        struct libnet_arp_hdr *arp_hdr = (struct libnet_arp_hdr *)(packet + LIBNET_ETH_H);
+        // printf("ARP: %s -> %s\n", inet_ntoa(*(struct in_addr *)arp_hdr->arp_spa), inet_ntoa(*(struct in_addr *)arp_hdr->arp_tpa));
+    }
+}
+
+// ARP 数据报处理函数
+void process_arp_packet(const u_char *packet)
+{
+    struct ether_header *eth_hdr = (struct ether_header *)packet;
+    
 }
\ No newline at end of file
diff --git a/router/net_task_thread.h b/router/net_task_thread.h
index e0b169a..c50c2c4 100644
--- a/router/net_task_thread.h
+++ b/router/net_task_thread.h
@@ -13,7 +13,7 @@ libnet_t *libnet_context1; // libnet1 上下文
 libnet_t *libnet_context2; // libnet2 上下文
 
 // libpcap 相关函数
-void open_device(pcap_t **device, char *dev_name);                                        // 打开网卡设备
+libnet_t *open_device(pcap_t **device, char *dev_name);                                        // 打开网卡设备
 void process_packet(u_char *arg, const struct pcap_pkthdr *pkthdr, const u_char *packet); // 处理数据包
 
 void *net_task(void *arg);