I've just installed Ethereal, and the traffic on my local LAN is boring. 3.4 I tried to open a tcpdump capture file under Red Hat 6.1, and it blowed up real good. I can't see any TCP packets other than packets to and from my machine, even though another sniffer on the network sees those packets. When I try to run Ethereal on Windows, it fails to run because it can't find packet.dll . When I try to download the WinPcap driver and library, I can't get to the WinPcap Web site.
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Below is a list of supported protocols and media. Taking that into consideration, Ethereal seemed like an appropriate name for an Ethernet sniffer. The configure script can't find pcap.h or bpf.h, but I have libpcap installed. If this is the case, you may have to tweak aclocal.m4. After installing the 4.1.1 version of the UCD SNMP header files, do a make clean and then rebuild Ethereal.