diff --git a/go/src/fullcycle/do-iperf/main.go b/go/src/fullcycle/do-iperf/main.go
index 9f693a8..e364963 100644
--- a/go/src/fullcycle/do-iperf/main.go
+++ b/go/src/fullcycle/do-iperf/main.go
@@ -4,6 +4,7 @@ import (
 	"bufio"
 	"fmt"
 	"io"
+	"io/ioutil"
 	"log"
 	"os"
 	"os/exec"
@@ -14,7 +15,12 @@ func main() {
 	var out io.Writer
 
 	if l := len(os.Args); l == 1 {
-		host = "172.30.0.1"
+		b, err := ioutil.ReadFile("host.iperf")
+		if err != nil {
+			host = "172.30.0.1"
+		} else {
+			host = string(b)
+		}
 		out = os.Stdout
 	} else if l == 2 {
 		host = os.Args[1]