Java: DatagramSocket and proxy (firewall)

It may be that I'm not understanding the UDP protocol...

I'm trying to receive data from a server using the UDP protocol, but I'm sitting behind a firewall. The URLConnection constructor can take an inst开发者_JS百科ance of Proxy (as well as a way to set up user name and password of such a proxy server).

How do I connect through a proxy server using the UDP protocol (DatagramSocket)?

Best regards, TX

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Most Proxy servers support the HTTP protocol which is TCP based, so you don't have to do anything with the proxy server to do this.

To pass UDP over a proxy server, you need a proxy which supports UDP. I don't know of any proxy server which supports this so you may have to write one yourself. It is worth noting that UDP is a connectionless protocol which means you have have to authenticate every packet.

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SOCKS5, which is an extension of SOCKS4, includes support for UDP in addition to authentication. One implementation of a SOCKS5 Server written in Java is JSOCKS. You can check this project out at http://jsocks.sourceforge.net/.

Refer to RFC 1928 (https://www.rfc-editor.org/rfc/rfc1928) for more information on SOCKS5.