On Thu, 29 Jan 2004, Daniel wrote:
>
> I installed ethereal and I have a powerbook an airport extreme and a
> PC. When I start capturing packets it catches TCP packets from my Mac,
> but when it comes to the PC it catches everything except TCP. I don't
> know if the router is stopping me or what. I tried turning of my
> firewall, but still no good.
>
You can check that ethereal is getting everything by using "tcpdump" for
a period of time, and checking that it sees the same stuff that ethereal
sees for the same segment of time.
That being said, however, I'm pretty sure I know what the problem is,
and I don't think it's ethereal.
Your Mac and PC are probably plugged into a network switch. This may be
a sort of virtual switch, if they're both wireless, but chances are that
they are not talking directly, but both talking to your airport. With a
network switch, an IP packet (TCP or otherwise) coming from your PC will
only go to the specified destination. Of all the packets coming from
your PC, NetBEUI and IPX and other crap protocols will often be broadcast
packets, meaning that they are supposed to go to everything on the network.
The network switch does as requested, and sends them everywhere, including
your Mac. When the PC talks TCP, the IP packets will only go to a single
destination, which is very likely your default route, which might be a
NAT box ("internet router"), or perhaps in the airport.
If you send data to the address of your Mac, does it see it then?
As was stated in another reply, much more specific information on your
network configuration would be required for further debugging.
If my theory is correct, you could hard-wire both systems to an old
network hub, and the Mac would see everything coming out of the PC.
Wayne
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Wayne Brehob [EMAIL PROTECTED]
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