BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Routing messages          BorlandTalk.com Forum Index -> Delphi Internet Winsock View previous topic :: View next topic   Author Message Mirakq Guest Posted: Tue Aug 22, 2006 4:40 pm    Post subject: Routing messages using TIdUDPServer - OnUDPRead event: will the data be routed to the client that has sent it (if it doesn't have a real IP address) by using the ABinding.SendTo(ABinding.PeerIP, ABinding.PeerPort, cmd, SizeOf(cmd)); method ? Back to top Remy Lebeau (TeamB) Guest Posted: Tue Aug 22, 2006 10:47 pm    Post subject: Re: Routing messages "Mirakq" <ak_47 (AT) abv (DOT) bg> wrote in message news:44eaed36 (AT) newsgroups (DOT) borland.com... Quote: using TIdUDPServer - OnUDPRead event: will the data be routed to the client that has sent it (if it doesn't have a real IP address) by using the ABinding.SendTo(ABinding.PeerIP, ABinding.PeerPort, cmd, SizeOf(cmd)); method ? The PeerIP is always the real IP address of the sender. If the client is behind a router, then the router is the Sender that TIdUDPServer will see, so the IP will be the router's IP. As such, the router would need to have port forwarding configured in order to deliver inbound data to the appropriate client. Gambit Back to top Miraka Guest Posted: Wed Aug 23, 2006 1:57 am    Post subject: Re: Routing messages "Remy Lebeau (TeamB)" <no.spam (AT) no (DOT) spam.com> wrote in message news:44eb43f1 (AT) newsgroups (DOT) borland.com... Quote: "Mirakq" <ak_47 (AT) abv (DOT) bg> wrote in message news:44eaed36 (AT) newsgroups (DOT) borland.com... using TIdUDPServer - OnUDPRead event: will the data be routed to the client that has sent it (if it doesn't have a real IP address) by using the ABinding.SendTo(ABinding.PeerIP, ABinding.PeerPort, cmd, SizeOf(cmd)); method ? The PeerIP is always the real IP address of the sender. If the client is behind a router, then the router is the Sender that TIdUDPServer will see, so the IP will be the router's IP. As such, the router would need to have port forwarding configured in order to deliver inbound data to the appropriate client. Gambit I understand that but it should be possible to for the server just to reply through the open socket or something (without port forwarding because the sysadmin should be a friend of yours to forward a port to your inner address). Back to top Remy Lebeau (TeamB) Guest Posted: Wed Aug 23, 2006 3:41 am    Post subject: Re: Routing messages "Miraka" <ak_47 (AT) abv (DOT) bg> wrote in message news:44eb6fc1$1 (AT) newsgroups (DOT) borland.com... Quote: I understand that but it should be possible to for the server just to reply through the open socket That is exactly what the code you showed earlier is actually doing - sending a reply back to the PeerIP/PeerPort where the incoming data actually came from. Whether or not that PeerIP/PeerPort cooresponds to an actual client, or to a router sitting in front of the client, does not make any difference at all to the server when sending back the reply. If a router is involved, then as far as the server is concerned, the router *is* the client. What the router does on its end to make sure the reply data reaches the real client is outside the server's knowledge or control. Just send the data to the PeerIP/PeerPort normally, and let the router handle the rest on its end. Quote: without port forwarding The only way to send data to a client through a router without using port forwarding is if the router has been put into DMZ mode, where all inbound data is immediately forwarded to the client machine without any other routing rules applied. Otherwise, you must use port forwarding. That is the only way routers can know which client machine to forward inbound data to on a per-packet basis. Quote: because the sysadmin should be a friend of yours to forward a port to your inner address Sorry, but port forwarding and DMZ are the only two options in order to get the data through a router. 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