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I got your IP adress, see you soon kiddo 😎
I’m already in the network… Wait…
OP must be my neighbour
Wait a second… That’s MY ip!
Wait … the ping is coming from inside the house!
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.This exactly. And because this is open-source, its super easy to track this down. I searched for the source of the error message:
https://github.com/iputils/iputils/blob/3400f3a740942064a545f02aabcf68e234733297/ping/ping.c#L237
see this is
ping_strtod
function - so search for that function name and the first hit is the ‘-i’ case:case 'i': { double optval; optval = ping_strtod(optarg, _("bad timing interval")); if (isless(optval, 0) || isgreater(optval, (double)INT_MAX / 1000)) error(2, 0, _("bad timing interval: %s"), optarg); rts.interval = (int)(optval * 1000); rts.opt_interval = 1; } break;