I do this on an Ubuntu 10.04 server:
root@doppio:~# tcpdump -c1000 net xxx.yy.zz.0/24 > /tmp/tcpdump.pcap
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
1000 packets captured
1058 packets received by filter
Then I copy it down to my Mac where I have wireshark installed. Version 1.3.4 (SVN Rev 32340 from /trunk)
In the finder the file gets the right icon. When I double click it, Wireshark is thinking for a few seconds, than puts this message up:
The file "/Volumes/Home/janos/tcpdump.pcap" isn't a capture file in a format Wireshark understands.
So the question is how should I do the tcpdump on Ubuntu to be able to open it in Wireshark on my Mac ?