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Wait a second… That’s MY ip!
Wait … the ping is coming from inside the house!
I got your IP adress, see you soon kiddo 😎
OP must be my neighbour
I’m already in the network… Wait…
Wow, that is an unhelpful error message. It could have told you it was expecting a number. It turns out that
-i
is short for “interval” and expects a number, whereas-I
is used to specify an interface.