fix

main.cpp

@@ -19,7 +19,7 @@ void inbound(int raw, int tun) {
     socklen_t addrlen;
     size_t nread;
     while ((nread = recvfrom(raw, buf, sizeof(buf), 0, (sockaddr *) &addr, &addrlen)) >= 0) {
-        std::cout << nread << std::endl;
+        std::cout << "recv " << nread << " bytes from" << inet_ntoa(addr.sin_addr) << std::endl;
         if (write(tun, buf, nread) < 0) {
             perror("inbound write");
         }