Listening on en4, link-type EN10MB (Ethernet), capture size 262144 bytes Here’s how tcpdump looks when I’m not looking up hostnames: tcpdump -i en4 -qtnp -c 1 'host tcpdump: verbose output suppressed, use -v or -vv for full protocol decode Since these aren’t particularly human-friendly, some tools place a DNS query to turn the IP address into a hostname for display. Packets have both a source and destination IP address. To illustrate them, we’ll show how to actually use these techniques with 3 common packet capture tools Tcpdump, Zeek, and Wireshark. We want to share some of the most common techniques that help packet capture programs keep up with the load. The three tasks of reading packets from network interfaces, doing any needed processing, and sending results to disk/screen may seem like tame things to do, but they’re asked to do this to millions of packets per second. Packet capture tools regularly have problems with performance.
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