前言
李柱明博客:https://i.cnblogs.com/posts/edit-done;postId=15487160
正文
在多網卡編程時,指定使用特定的網卡,通過 bind();
綁定就可以了。
- 注意:原理是在
connect();
里面會輪詢網卡鏈表,找出 IP 對應的網卡進行連接。
如:
網卡 A:192.168.111.112
網卡 B:10.113.114.115
若使用網卡 A(客戶端 demo):
// Error checking omitted for expository purposes
int sockfd = socket(AF_INET, SOCK_STREAM, 0);
// Bind to a specific network interface (and optionally a specific local port)
struct sockaddr_in localaddr;
localaddr.sin_family = AF_INET;
localaddr.sin_addr.s_addr = inet_addr("192.168.111.112");
localaddr.sin_port = 0; // Any local port will do
bind(sockfd, (struct sockaddr *)&localaddr, sizeof(localaddr));
// Connect to the remote server
struct sockaddr_in remoteaddr;
remoteaddr.sin_family = AF_INET;
remoteaddr.sin_addr.s_addr = inet_addr(server_ip);
remoteaddr.sin_port = htons(server_port);
connect(sockfd, (struct sockaddr *)&remoteaddr, sizeof(remoteaddr));