tcpdump error: no suitable device found


 
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# 1  
Old 05-17-2004
tcpdump error: no suitable device found

Hi,

I'm trying to use tcpdump for the first time. I installed tcpdump from the rpm. Now when I issue the command tcpdump port 6666, I get an error

tcpdump: no suitable device found

Can you tell me what's wrong there?

Thanks.
# 2  
Old 05-17-2004
You need to run tcpdump as root. Same goes with tools that depend on it such as ethereal and ngrep.

Peace,
ZB
http://www.zazzybob.com
# 3  
Old 05-17-2004
I was the root on this occasion.

Thanks.
# 4  
Old 05-17-2004
Which OS are you using??

Under some OSs (BSD, Solaris) you must have read access to the /dev/bpf* devices.



Peace,
ZB
http://www.zazzybob.com
# 5  
Old 05-17-2004
It's Linux on i686.

Please detail the procedure I have to do.

Thanks.
# 6  
Old 05-17-2004
If your OS is Linux, try tcpdump -i eth0 dst port 6666 This will show you traffic heading towards port 6666. Conversly tcpdump -i eth0 src port 6666 shows traffic heading out of port 6666. man tcpdump should provide the answers.

Try tcpdump -i eth0 should dump all traffic.

Cheers
ZB
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