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@@ -70,7 +70,7 @@ func networkSize(mask net.IPMask) (int32, error) {
                      func iptables(args ...string) error {
                      	path, err := exec.LookPath("iptables")
                      	if err != nil {
                     -		log.Fatal("command not found: iptables")
                     +		return fmt.Errorf("command not found: iptables")
+                     	}
                      	if err := exec.Command(path, args...).Run(); err != nil {
                      		return fmt.Errorf("iptables failed: iptables %v", strings.Join(args, " "))

Return error when iptables is not found