How to install/enable simple proxy and port forwarding?

On a Linux system I want to do the following:

I want to listen on port 2345 for incoming requests from Internet.
When a request is arriving it should be (unchanged) taken and "forwarded"
to another computer with IP 123.456.123.456 and port 6789

I think this scenario is a kind of simplified proxy plus port forwarding.

How can I achieve this?

I prefer not to install some special additional software but to configure some local network files
for this special scenario.

That means incoming request e.g. on http port 80 should not be touch but treated as "normal"
by the local HTTP web server.

Matthew

Matthew Lincoln wrote:
> On a Linux system I want to do the following:
>
> I want to listen on port 2345 for incoming requests from Internet.
> When a request is arriving it should be (unchanged) taken and "forwarded"
> to another computer with IP 123.456.123.456 and port 6789
>
> I think this scenario is a kind of simplified proxy plus port forwarding.
>
> How can I achieve this?
>
> I prefer not to install some special additional software but to configure some local network files
> for this special scenario.
>
> That means incoming request e.g. on http port 80 should not be touch but treated as "normal"
> by the local HTTP web server.
>
> Matthew


Get a suitable set of documentation from http://www.netfilter.org/

Click the link HOWTOs on the left sidebar and pick the documents
you feel necessary.

For a newbie, the 'Tutorials' block is a good starting point.

--

Tauno Voipio
tauno voipio (at) iki fi

Matthew Lincoln schreef:
> On a Linux system I want to do the following:
>
> I want to listen on port 2345 for incoming requests from Internet.
> When a request is arriving it should be (unchanged) taken and "forwarded"
> to another computer with IP 123.456.123.456 and port 6789
>
> I think this scenario is a kind of simplified proxy plus port forwarding.
>
> How can I achieve this?
>
> I prefer not to install some special additional software but to configure some local network files
> for this special scenario.
>
> That means incoming request e.g. on http port 80 should not be touch but treated as "normal"
> by the local HTTP web server.
>
> Matthew

This is a simple solution for this:
http://sourceforge.net/projects/simpleproxy

In comp.os.linux.misc Matthew Lincoln <(E-Mail Removed)> wrote:
> I want to listen on port 2345 for incoming requests from Internet.

TCP, UDP, or both?

> When a request is arriving it should be (unchanged) taken and "forwarded"
> to another computer with IP 123.456.123.456 and port 6789

Look at iptables, specifically the DNAT option.

> I think this scenario is a kind of simplified proxy plus port forwarding.

I guess you could do that, but it wouldn't be unchanged as you'd be
terminating the session on your proxy and establishing a new connection
from there to your destination server.

Chris

Matthew Lincoln wrote:
> On a Linux system I want to do the following:
>
> I want to listen on port 2345 for incoming requests from Internet.
> When a request is arriving it should be (unchanged) taken and "forwarded"
> to another computer with IP 123.456.123.456 and port 6789
>
> I think this scenario is a kind of simplified proxy plus port forwarding.
>
> How can I achieve this?
>
> I prefer not to install some special additional software but to configure some local network files
> for this special scenario.
>
> That means incoming request e.g. on http port 80 should not be touch but treated as "normal"
> by the local HTTP web server.
>
> Matthew

http://www.google.co.uk/search?q=lin...ient=firefox-a

Matthew Lincoln wrote:
> On a Linux system I want to do the following:
>
> I want to listen on port 2345 for incoming requests from Internet.
> When a request is arriving it should be (unchanged) taken and "forwarded"
> to another computer with IP 123.456.123.456 and port 6789
>
> I think this scenario is a kind of simplified proxy plus port forwarding.
>
> How can I achieve this?
>
> I prefer not to install some special additional software but to configure some local network files
> for this special scenario.
>
> That means incoming request e.g. on http port 80 should not be touch but treated as "normal"
> by the local HTTP web server.
>
> Matthew

http://www.google.co.uk/search?q=lin...ient=firefox-a

And there's no need to post this in multiple groups.

(E-Mail Removed) (Matthew Lincoln) writes:
> On a Linux system I want to do the following:
>
> I want to listen on port 2345 for incoming requests from Internet.
> When a request is arriving it should be (unchanged) taken and "forwarded"
> to another computer with IP 123.456.123.456 and port 6789
>
> I think this scenario is a kind of simplified proxy plus port forwarding.
>
> How can I achieve this?

Here's one way, anyway: from the internal host, ssh to the
internet-facing host and set up a reverse tunnel for 2345 to go to the
internal host's 6789:

host_123.456.123.456 $ ssh -R2345:127.0.0.1:6789 user@thatinternetfacingserverip

man ssh() and look at -R

You'll need to do some monkeying with teh internet server's
sshd_config file to get port 6789 to open on the external interface
rather than just on its loopback. Bonus here is that the traffic is
forwarded over a secure tunnel if that's of any use to ya.


--
Todd H.
http://www.toddh.net/

On Nov 18, 12:08*pm, kmlincoln...@hotmail.com (Matthew Lincoln) wrote:
> On a Linux system I want to do the following:
>
> I want to listen on port 2345 for incoming requests from Internet.
> When a request is arriving it should be (unchanged) taken and "forwarded"
> to another computer with IP 123.456.123.456 and port 6789
>
> I think this scenario is a kind of simplified proxy plus port forwarding.
>
> How can I achieve this?
>
> I prefer not to install some special additional software but to configuresome local network files
> for this special scenario.
>
> That means incoming request e.g. on http port 80 should not be touch but treated as "normal"
> by the local HTTP web server.
>
> Matthew

You should be able to do that with the port forwarding from ssh.
Look at the -L option in ssh.