server: set IPTOS_LOWDELAY in TCP connections

this helps edge routers to prioritize our interactive network traffic.
2021-02-20 16:56:55 -05:00
1 changed files with 4 additions and 2 deletions
@@ -224,8 +224,10 @@ static void client_bootstrap(struct tmate_session *_session)

 	{
 	int flag = 1;
-	setsockopt(ssh_get_fd(session), IPPROTO_TCP, TCP_NODELAY,
-		   &flag, sizeof(flag));
+	int fd = ssh_get_fd(session);
+	setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &flag, sizeof(flag));
+	flag = 0x10;  /* IPTOS_LOWDELAY */
+	setsockopt(fd, IPPROTO_IP, IP_TOS, &flag, sizeof(flag));
 	}

 	/*