Re: watching outgoing ping packets via tcpdump/ethereal

Rick Jones wrote:
> Are you sure the driver/interface support promiscuous mode?
>
> Are you sure that the interface/driver went into promiscuous mode?
>
> Do you have proper permissions to enable promiscuous mode?
>
> How long are you waiting for output? Perhaps it is being buffered.
>
> Are you disabling IPaddress to name lookups to avoid issues with
> reaching a DNS server (since you say you are back to back)?
>
> rick jones

Hi,
Just an update on the situation, I can say none of the above might be
the cause; I have connected my host and the testing client to a
network. Host listens on the client by:

% tcpdump ether host <MAC ADDRESS> -xx -vvv

In this setup client receives its IP via dhcp from some server on the
network. The dhcp packets are caught by tcpdump on my host. I have also
inserted prints on xmit and receive functions in the ethernet driver on
the client, the dhcp traffic is also visible there.

At this point, the client successfully received an IP address. Now, on
my host, if I ping the client with its IP address, the ping is
successful, I see replies for each ping request. I can do this from the
client to host also. But this ping traffic neither shows up on the
client's ethernet driver nor on the tcpdump window on the host. Any
ideas why ping wouldn't show up but dhcp would?

Do you have any suggestions for generating other basic network traffic
than ping that would show up?

Thanks,
Bahadir

.

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