3 ms·
Depends on how big the building is that houses it – manufacturing IT can deal with impressive floor spaces. I once only half jokingly suggested finding a missi
by owenmarshall 6y ago
Depends on how big the building is that houses it – manufacturing IT can deal with impressive floor spaces.
I once only half jokingly suggested finding a missing data closet in a two million square foot distribution center by pinging a known IP from three or four aggregator switches across the building and triangulating the location on a floor plan. Sadly the people crawling around the ceiling found it before I could put my idea into practice.
- pbhjpbhj 6y ago2Msqft is c.430m x 430m for a square floorplan. Ping resolution is 1us (microsecond). Speed of electrical signal in cooper is about 0.8c. Gives a max resolution of ~240m by my reckoning. If there are variances in the switch+network delay it seems like you're going to struggle to even say which side of the building it is. Good job they found it!
- owenmarshall 6y agoHah! Good math. Based on the switch placement and the building being more of a rectangle I figured "north side or south side" would be as close as I could get. And when we really dug in it was a classic last mile problem: the first several core switches were well known, we just needed to figure out where the last aggregate switch went. Turns out a door was closed and a new one built to a hallway to another hallway and not properly labeled on the updated drawings. Had one of the boxes running a conveyor belt not have died, we'd never have looked.