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Full Discussion: UDP/ tunnel
Special Forums Windows & DOS: Issues & Discussions UDP/ tunnel Post 302355083 by upengan78 on Monday 21st of September 2009 11:39:35 AM
Old 09-21-2009
UDP/ tunnel

Hi,

I know tcp port tunneling can be done using ssh/putty. how about udp?

I have a scenario where a license server handsout licenses to machines in that network ONLY. I have a windows machine in a different subnet and even though the client software can see license server, while using the software the lic. server denies the permission because the windows machine is not in the same subnet as that of license server.

The license server here is windows. The service runs on port_a ( I think this should be 2047 UDP for opnet)

There are solaris / linux machines in the same network as that of license server which can be used for tcp/udp tunneling but I don;t know how I should make use of that. I do have account on those unix/linux machines and tcp forwarding/gateway ports is enabled in sshservers.

Is there anyway from client(windows), I can specify " localhost : port_a "as license server and so software will query to localhost:2047(udp). Can we forwards 2047 UDP to localhost:2047(tcp)?

Then do ssh tcp forwarding to linux machine for tcp port 2047. Then on remote linux machine forward tcp 2047 to localhost:2047(udp) and forward that udp 2047 to license server 2047 (udp)?

Is this technically possible? May be using nc(netcat) or udp_redirect?

or if there is any other way to let such users use the lic. servers successfully?

Please help..Smilie
Thanks in advance!
 

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udp(n)								 Tnm Tcl Extension							    udp(n)

__________________________________________________________________________________________________________________________________________________

NAME
udp - Send and receive UDP datagrams. _________________________________________________________________ DESCRIPTION
The udp command allows to send and receive datagrams using the User Datagram Protocol (UDP) (RFC 768). UDP COMMAND
udp open [port] The udp open command opens a UDP datagram socket and returns an udp handle. The socket is bound to given port number or name. An unused port number is used if the port argument is missing. udp connect host port The udp connect command opens a UDP datagram socket and connects it to a port on a remote host. A connected UDP socket only allows to send messages to a single destination. This usually allows to shorten the code since there is no need to specify the destination address for each udp send command on a connected UDP socket. The command returns a udp handle. udp send handle [host port] message The udp send command sends a datagram containing message to the destination specified by host and port. The host and port arguments may not be used if the UDP handle is already connected to a transport endpoint. If the UDP handle is not connected, you must use these optional arguments to specify the destination of the datagram. udp receive handle The udp receive command receives a datagram from the UDP socket associated with handle. This command blocks until a datagram is ready to be received. In most cases, it might be a good idea to check for pending datagrams using the udp bind command. udp close handle The udp close command closes the UDP socket associated with handle. udp bind handle readable [script] udp bind handle writable [script] The udp bind command allows to bind scripts to a UDP handle. A script is evaluated once the UDP handle becomes either readable or writable, depending on the third argument of the udp bind command. The script currently bound to a UDP handle can be retrieved by calling the udp bind command without a script argument. Bindings are removed by binding an empty string. udp info [handle] The udp info command without the handle argument returns a list of all existing UDP handles. Information about the state of a UDP handle can be obtained by supplying a valid UDP handle. The result is a list containing the source IP address, the source port, the destination IP address and the destination port. SEE ALSO
scotty(1), Tnm(n), Tcl(n) AUTHORS
Juergen Schoenwaelder <schoenw@cs.utwente.nl> Tnm udp(n)
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