How broadcast ping works?

Hi Can someone tell me why when I send broadcast ICMP Request, only router send me ICMP Reply? Even if I modify MAC destination of this ICMP Request (original is FF:FF:FF:FF:FF:FF) to MAC specific host (IP still broadcast that local network ...it still don开发者_如何学C't send me Reply. Why?

---

From RFC1122: "An ICMP Echo Request destined to an IP broadcast or IP multicast address MAY be silently discarded"

MS Windows usually discard broadcast ping. Check that your computers are really running MS Windows.