> I think I didn’t mention -n in that post because at the time I didn’t know why the -n flag was useful (it’s useful because it turns off this annoying reverse

> I think I didn’t mention -n in that post because at the time I didn’t know why the -n flag was useful (it’s useful because it turns off this annoying reverse DNS lookup that tcpdump does by default so you can see the IP addresses). Meanwhile, I remove -n from all tcpdump commands, because we use hostnames all the time at work, and I can remember them, and I can't remember a bunch of numbers.