How to run tcpdump by cron?

Question

ubuntu

Hello. There is a need to run tcpdump. How can this be done via cron?
Because doing it by hand is not an option. What is in the Internet on this topic is not suitable.

Answer 1

Didn't understand.
Give an example of what is not working for you.
It should work like this (for example):

52      3       *       *       *       root    /usr/sbin/tcpdump -i ethX src 189.9.34.2 > /home/username/tcpdump.out

Answer 2

Nadz Goldman Thanks, I just didn't specify /usr/sbin/ Everything works.

Answer 3

Maybe it's better to use at?
(at least for a one-time run)