Re: port forwarding with one interface to trace traffic?

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Hi,

Caracal - G. Hostettler schrieb:
Just one silly question:

Do you have a "1" in /proc/sys/net/ipv4/ip_forward ?
If a zero, nothing will go through.

yep, of course it's setup to "1".


BTW, I never used such a config with only on interface.

may be it's not possible, or the setup for only one interface is more complicated!?

I am *not* a guru, but having a mask of /32 instead of /24 seems strange to
me.

as long as I know it means no subnet, just the IP for the host..

What is the mask on your printer and on your Mc ?

class C (255.255.255.0)


cu
 rasca


I want to setup a specific port forwarding to trace the ip traffic between a macos9 and a hp net printer to debug a spooler problem.

I thought the port forwarding feature of linux/iptables
would be nice to do that. But until now I wasn't able
to get it running ;-(

May be some one can help here. The setup is quite simple.

* one class C net (192.168.10.0)
* a linux box with one interface (eth0), kernel 2.4.24
  and iptables 1.2.9 (192.168.10.156

* macos9 machine with 9.2.x (192.168.10...)

* HP laser printer with network interface (192.168.10.9)

I want to configure the Mac to print to the linux box.
The linux box should do port forwarding to the hp printer.
So I can use "ethereal" or what ever to dump the traffic.

Because it's not a firewall all chains have as default
"accept".

I added the following rule (which seems not to be enough,
cause the printing freezes):

iptables -t nat -A PREROUTING -p tcp --dport 515 \
-d 192.168.10.156/32 -j DNAT --to-dest 192.168.10.9:515

Any ideas?

thx + cu
 rasca


-- _______________________________________________________________ | Triad Berlin Projektgesellschaft mbH | http://www.triad.de/ |






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| Triad Berlin Projektgesellschaft mbH | http://www.triad.de/ |



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