///<summary>This sends an Icmp Request to the specified address, we want
///him to respond to us, so we can guarantee that by pretending to be the
///Server (i.e. x.y.z.1). We'll get a response in our main thread.</summary>
///<param name="dest_ip">Destination IP of our request.</summary>
protected virtual void SendIcmpRequest(MemBlock dest_ip) {
if(_dhcp_server == null) {
return;
}
MemBlock ether_addr = null;
if(!_ip_to_ether.TryGetValue(dest_ip, out ether_addr)) {
ether_addr = EthernetPacket.BroadcastAddress;
}
IcmpPacket icmp = new IcmpPacket(IcmpPacket.Types.EchoRequest);
IPPacket ip = new IPPacket(IPPacket.Protocols.Icmp, _dhcp_server.ServerIP,
dest_ip, icmp.Packet);
EthernetPacket ether = new EthernetPacket(ether_addr,
EthernetPacket.UnicastAddress, EthernetPacket.Types.IP, ip.ICPacket);
Ethernet.Send(ether.ICPacket);
}
