问题
I have a simple requirement of a software level port forwarding/tunnelling of socket based communication.
- I have a source server and port using Sockets. This is a java program which works both in windows and linux and this is irrelevant.
- I have devices which keep sending data to this port. There may be a bi-directional communication
- I want to redirect this data to another remote server and port. So for the clients they will not have to worry about change of ip address whenever I move my app server.
Are there any tools/deamon/service programs which I can use to configure and do this?
I tried SSH, but to my understanding this needs a SSH protocol enabled server. In my case this is not applicable. I also tried using JSch but this again is an implementation of SSH in java format.
Can someone throw some pointers? Is it possible to use iptables NAT in linux?
回答1:
You can try netcat or socat (it's more powerful than netcat)
An example for socat to forward port 80 using tcp4:
socat tcp4-listen:80,fork tcp4:{another server}:{another port}
and refer to http://en.wikipedia.org/wiki/Netcat#Port_Forwarding_or_Port_Mapping for netcat
Both are not java-related.
回答2:
There is a TCP/IP port forwarding utility named portforward available in code.google.com. It is entirely written in Java.
回答3:
If you're running xinetd on your system already, it provides a simple port forwarding mechanism that might be useful if you're not running IPTables already.
If you are running IPTables, Server Fault has an excellent, short question with a very similar goal. Though I find it a bit terse more detailed documentation is available.
来源：https://stackoverflow.com/questions/8374069/port-forwarding