Ethereal and routers question

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I succesfully installed the Ethereal on a RH9. I would like to capture the packets for the whole network , not just those coming and going to my eth1.
This RH9 is a desktop in the network and "not used as a router", then I'm not sure if it's possible to sniff into the routers packets. The router is a Linksys Wireless-B Broadband Router BEFW11S4.
I think (not sure why) I'm capturing everything coming into the LAN but only those packets going out from my eth1. This means I get :


192.168.1.100 <----> WAN

but only

LAN (192.168.1.xxx) <----- WAN

and I would like to have from this desktop (I don't know how to do this on the Linksys)

LAN (192.168.1.xxx) <-----> WAN

in order to capture all the packets.

My network map is something like this:

INTERNET
          |
Dinamic public IP (WAN)
 | CISCO 677*|
      10.0.0.1 (LAN)
           |
      10.0.0.2 (LAN?/Intenet?)
   | Linksys**|
   192.168.1.1 (LAN)
           |
           |---192.168.1.100 (RH9 w/Ethereal)
           |---192.168.1.101
           |---192.168.1.102
           |---192.168.1.nnn

* DSL modem router using PPPoA
** router and wireless accespoint

any clue to use the ethereal to capture in/out Linksys packets?
Also I would like to have an advice if there is another way to configure this devices (DSL modem router/ Wireless router) referring to ip lan side numbering (10.0.0.1/10.0.0.2/192.168.1.1/192.168.1.nnn)


Thanks in advance,

Sergio

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