Ray Olszewski wrote:
At 03:46 PM 8/13/2004 -0400, chuck gelm wrote:
Hi, Everyone:
I am having difficulty displaying the pattern data
inside a 'ping' packet using 'tcpdump'.
I am sending a periodic 'broadcast' padded with 'data':
ping -f -i 3600 -p 204445204E43385120 #" DE NC8Q "
I want to display this data on a console. I am using
'tcpdump -i eth1 -v -X'
but this shows too much data/activity.
'tcpdump -i eth1 -v -X port 7' displays nothing.
Perhaps something other than 'tcpdump' would be more suitable?
1. How can I display only the 'echo request' packets?
tcpdump icmp[icmptype]=icmp-echo -v -X
2. How can I display only the 'echo reply' packets?
tcpdump icmp[icmptype]=icmp-echoreply -v -X
:-) Thanks, Ray.
Now I see it in the man page. :-|
I am 'playing' with some 802.11b (USA FCC Part 15) devices
and configuring them to use frequencies inside the USA Amateur
Radio assignment (USA FCC part 97).
Then I can legally use antennas other than the ones that came
with the device. I have some 24dbi gain dish antennas and I
want to try to use passive reflectors to overcome the
limitations of 'line of sight'.
This 'ping - tcpdump' will show that I am compling with the
'Station Identification' requirements.
Many thanks,
Chuck
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