Re: [twsocket] When receiving UDP datas, find if there were sent through a broadcast
I don't think this exists. However, I see two solutions for your problem: One easy and one more complex. 1) Easy: In the data packet you send, add the server address. Those not having that address will then easily detected. This is easy but required to somewhat change the protocol you use and this may not be possible for you. Good news, i found out that in my data packets, i had already a flag for that ! 2) Complex: Use a second TWSocket in raw mode to get hand on all packets. You can then peek in the raw packet to find the destination address which is 255.255.255.255. Complex, i agree -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
Re: [twsocket] When receiving UDP datas, find if there were sent through a broadcast
>> I don't believe there is anything in the IP protocol that will >> identify a broadcast > If not, is there a flag somewhere in twsocket to tell an UDP socket > to ignore clients who knocks on a given port with a 255.255.255.255 address ? I don't think this exists. However, I see two solutions for your problem: One easy and one more complex. 1) Easy: In the data packet you send, add the server address. Those not having that address will then easily detected. This is easy but required to somewhat change the protocol you use and this may not be possible for you. 2) Complex: Use a second TWSocket in raw mode to get hand on all packets. You can then peek in the raw packet to find the destination address which is 255.255.255.255. -- francois.pie...@overbyte.be Embarcadero MVP http://www.overbyte.be http://francois-piette.blogspot.com -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
Re: [twsocket] When receiving UDP datas, find if there were sent through a broadcast
> If not, is there a flag somewhere in twsocket to tell an UDP > socket to ignore clients who knocks on a given port with a > 255.255.255.255 address ? The only addresses provided by the protocol are source and destination, I don't know broadcasting is implemented, but would assume it's down to ARP tables of MAC addresses on the LAN. Angus -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
Re: [twsocket] When receiving UDP datas, find if there were sent through a broadcast
Angus, you can either arrange the clients tell you as part of the data you send seems to be the simplest solution but needs to change the client software. use a different port for broadcasts also needs to change the client software. keep track of the IP addresses locally in action already. I don't believe there is anything in the IP protocol that will identify a broadcast If not, is there a flag somewhere in twsocket to tell an UDP socket to ignore clients who knocks on a given port with a 255.255.255.255 address ? Lionel -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
Re: [twsocket] When receiving UDP datas, find if there were sent through a broadcast
> I have a server with an UDP socket listening. > Some Clients connect with the Ip address of the server : Direct > Addressing. > Some Clients do not know the Ip address of the server, therefore > they connect by sending a broadcast. > In OnDataAvailable event, i would like to know which Clients have > been connected through a broadcast. I don't believe there is anything in the IP protocol that will identify a broadcast. So you can either arrange the clients tell you as part of the data you send, use a different port for broadcasts, or keep track of the IP addresses locally (if you know already). In DataAvailable, you can use ReceiveFrom the get the IP address of the remote client. Angus -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
[twsocket] When receiving UDP datas, find if there were sent through a broadcast
Hi, I have a server with an UDP socket listening. Some Clients connect with the Ip address of the server : Direct Addressing. Some Clients do not know the Ip address of the server, therefore they connect by sending a broadcast. In OnDataAvailable event, i would like to know which Clients have been connected through a broadcast. procedure TFormprin.WSocketServerUDPDataAvailable(Sender: TObject; Error: Word); begin if .. then panel1.caption:='Broadcast' else panel1.caption:='Direct addressing'; end; How can i achieve this ? Thanks, Lionel -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
