[K12OSN] Reading TCP packets

Julius Szelagiewicz julius at turtle.com
Wed Jul 23 21:40:18 UTC 2008

So, Sudev, you'd rather have a "conforming" email that one with an answer?

The mechanism you can use is the same one used for port redirection for
internet proxy. Below is my entry in nat table for proxy forwarding:
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j DNAT
iptables -t nat -A OUTPUT -p tcp --dport 80 -j DNAT --to-destination

You would modify it by adding --source (your packet generator) and change
port for the listener. Piece of cake.

On Wed, 23 Jul 2008, Sudev Barar wrote:

> This may not be correct place but collective wisdom can perhaps point
> me to a good resource.
> I have a remote device that is generating data and is sending as a TCP
> packet to designated IP:Port. If I open and set a non standard port I
> am able to receive the packets using a listener. Problem is that the
> host where I have to move this project allows listening only on port
> 80 (apache) or port 25/110 (mail) or port 22 (ssh)
> How can I set up apache or iptables to log in incoming data packets
> while at the same time allow apache to serve web pages?
> My google time continues to turn up inconclusive leads.
> --
> Regards,
> Sudev Barar
> Read http://blog.sudev.in for topics ranging from here to there.
> PS: I know most of people do not follow email niceties (mostly they
> are not aware) but if you follow bottom post/in-line post style of
> email conversations it becomes a whole lot easier to carry on
> meaningful dialogue and you can snip out what is not meaningful too.
> Most people just hit reply button and top post leaving prior message
> appended uselessly at bottom. See if you can adopt this style and
> persuade others. In case you are already doing this ..... great,
> spread the message.
> _______________________________________________
> K12OSN mailing list
> K12OSN at redhat.com
> https://www.redhat.com/mailman/listinfo/k12osn
> For more info see <http://www.k12os.org>

More information about the K12OSN mailing list