这个UDP组播能跨网关吗,诚请大侠相救?(50分)

我们单位有多个局域网,如: 11.154.176.* //11.154.160.*//11.154.165.* 等多局域网组成的网络,利用路由器组成了一个独立的网络并且不接入互联网,与互联网是物理隔绝.下面这个组播程序能通过网关把信息从一个局域网传到其他局域网吗?如果能路由器应该怎样配置,能给出具体的配置方案吗!非常感谢.

程序如下:unit udp;

interface

uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, winsock,
StdCtrls;

const
WM_SOCK = WM_USER + 1; //自定义windows消息
UDPPORT = 6543; //设定UDP端口号

//D类地址224.0.0.0 - 239.255.255.255
//若为224.0.0.1则本机也能收到，否则本机收不到，其它机器能收到。
MY_GROUP = '224.0.0.2';


(*
* Argument structure for IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP.
* Delphi5自带的winsock.pas中没有ip_mreq的定义。
*)

type
ip_mreq = record
imr_multiaddr: in_addr; (* IP multicast address of group *)
imr_interface: in_addr; (* local IP address of interface *)
end;
TIpMReq = ip_mreq;
PIpMReq = ^ip_mreq;

type
Tfrmmain = class(TForm)
Button1: TButton;
Edit1: TEdit;
Memo1: TMemo;
Edit2: TEdit;
Label1: TLabel;
Label2: TLabel;
Label3: TLabel;
procedure FormCreate(Sender: TObject);
procedure FormClose(Sender: TObject; var Action: TCloseAction);
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
s: TSocket;
addr: TSockAddr;
FSockAddrIn : TSockAddrIn;
mreq:ip_mreq;
//利用消息实时获知UDP消息
procedure ReadData(var Message: TMessage); message WM_SOCK;
public
{ Public declarations }
procedure SendData(Content: String);
end;

var
frmmain: Tfrmmain;

implementation

{$R *.DFM}

procedure Tfrmmain.FormCreate(Sender: TObject);
var
TempWSAData: TWSAData;
//optval: integer;
begin
Edit1.Text := MY_GROUP;
// 初始化SOCKET
if WSAStartup($101, TempWSAData)=1 then
showmessage('StartUp Error!');

s := Socket(AF_INET, SOCK_DGRAM, 0);
if (s = INVALID_SOCKET) then //Socket创建失败
begin
showmessage(inttostr(WSAGetLastError())+' Socket创建失败');
CloseSocket(s);
//exit;
end;
//发送方SockAddr绑定
addr.sin_family := AF_INET;
addr.sin_addr.S_addr := INADDR_ANY;
addr.sin_port := htons(UDPPORT);
if Bind(s, addr, sizeof(addr)) <> 0 then
begin
showmessage('bind fail');
end;

{optval:= 1;
if setsockopt(s,SOL_SOCKET,SO_BROADCAST,pchar(@optval),sizeof(optval)) = SOCKET_ERROR then
begin
showmessage('无法进行UDP广播');
end;}

mreq.imr_multiaddr.S_addr := inet_addr(pchar(MY_GROUP));//htonl(INADDR_ALLHOSTS_GROUP);
mreq.imr_interface.S_addr := htonl(INADDR_ANY);
if setsockopt(s,IPPROTO_IP,IP_ADD_MEMBERSHIP,pchar(@mreq),sizeof(mreq)) = SOCKET_ERROR then
begin
showmessage('无法进行UDP组播');
end;


WSAAsyncSelect(s, frmmain.Handle , WM_SOCK, FD_READ);
//接收端SockAddrIn设定
FSockAddrIn.SIn_Family := AF_INET;
FSockAddrIn.SIn_Port := htons(UDPPORT);

label3.Caption := '端口：'+inttostr(UDPPORT);
end;

procedure Tfrmmain.FormClose(Sender: TObject; var Action: TCloseAction);
begin
CloseSocket(s);
end;

procedure Tfrmmain.ReadData(var Message: TMessage);
var
buffer: Array [1..4096] of char;
len: integer;
flen: integer;
Event: word;
value: string;
begin
flen:=sizeof(FSockAddrIn);
Event := WSAGetSelectEvent(Message.LParam);
if Event = FD_READ then
begin
len := recvfrom(s, buffer, sizeof(buffer), 0, FSockAddrIn, flen);
value := copy(buffer, 1, len);
Memo1.Lines.add(value)
end;
end;

procedure Tfrmmain.SendData(Content: String);
var
value{,hostname}: string;
len: integer;
begin
//FSockAddrIn.SIn_Addr.S_addr := INADDR_BROADCAST;
FSockAddrIn.SIn_Addr.S_addr := inet_addr(pchar(MY_GROUP));
value := Content;
len := sendto(s, value[1], Length(value), 0, FSockAddrIn, sizeof(FSockAddrIn));
if (WSAGetLastError() <> WSAEWOULDBLOCK) and (WSAGetLastError() <> 0) then
showmessage(inttostr(WSAGetLastError()));
if len = SOCKET_ERROR then
showmessage('send fail');
if len <> Length(value) then
showmessage('Not Send all');
end;

procedure Tfrmmain.Button1Click(Sender: TObject);
begin
senddata(Edit2.text);
end;

end.

自己先顶一下

初学　关注
对陆游器的设置　用　ＲＩＰ　协议就够了吧
１１开头是　Ａ类地址　按照你的ＩＰ　在一个网段里面　
当然你设置的子网掩码是２５５.２５５.０.０以后的话　按　ＲＩＰ协议是一样的
　其他的ＩＧＲＰ都差不多