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Wireshark-users: Re: [Wireshark-users] How to see HTTP hosts visited

From: "Gary Fritz" <fritz@xxxxxxxx>
Date: Tue, 13 Nov 2007 08:21:24 -0600
On 13 Nov 2007 at 12:00, Andreas Fink <afink@xxxxxxxxxxxxx> wrote:
> the two switches are not forwarding packets to your PC as the  
> destination of the packets are not meant to receive it
> You need to do the tracing on the WRTG54G itself (if it runs some  
> linux for example) or it should forward packets.

I believe it is running a linux OS, but I don't know of any way to change its 
programming to tell it to forward the packets.  Even if I dug through the 
source (which is available on the Linksys site!), I couldn't change the code in 
the router.

It has a Port Forwarding feature, but I think that's only to forward specific 
ports from the outside (internet) to an IP on the LAN.  I could tell it to forward 
port 80 traffic to my PC, but I think that would only forward incoming port-80 
requests from outside, not the port-80 traffic from my son's laptop.

(User manual, GPL source, etc are all available at
http://www.linksys.com/servlet/Satellite?c=L_CASupport_C2&childpagename
=US%2FLayout&cid=1166859837401&packedargs=sku%3DWRT54G&page
name=Linksys%2FCommon%2FVisitorWrapper&lid=3740137401B01&displa
ypage=download#versiondetail
)

> I dont think even without the two switches you will see the packets as
> they come/go from DSL and WLAN. So the WRT will not forward it to you
> because it knows (or thinks) you are not looking for those packets. 

What about computers that are connected directly to the WRT's ports, with 
no switches in the way?  Would they see the packets, or would the WRT still 
not forward the packets to those ports because they aren't the target of the 
packets?

If none of those tricks work, then I guess the only way to do this is to run 
Wireshark on my son's laptop.  Not the greatest solution.  Ohwell....

Thanks,
Gary