I am trying to debug some network issues on a BBB re traffic between the 
BBB and a web server. This BBB has is also using a canbus with the 
socketcan interface. I don't have experience with these tools, but I 
thought wireshark might help, and that I could use tcpdump on the BBB to 
feed it. 

When I try to run tcpdump, with or without explicitly specifying ether[0], 
it complains that can0 does not have an IPv4 address assigned, and that CAN 
link-layer filtering is not implemented, and exits. When I run "tcpdump 
-D", it shows only can0, as if eth0 does not exist at all. ifconfig does 
show eth0, and eth0 and can0 both work, I'm just trying to get more insight 
into the details of the traffic on eth0.

Can anyone tell my how to persuade tcpdump to ignore can0 and listen to 
eth0?

tcpdump 4.5.1
libpcap 1.5.3
Linux kernel 3.8.13 

Thanks

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