---
title: "EAGLE Trivia Challenge:  Why the ratnest?"
description: "(/wp-content/uploads/2014/01/EAGLE_GND_Plane_Ratsnest_Challenge-300x203.png)](/wp-content/uploads/2014/01/EAGLE_GND_Plane_Ratsnest_Challenge.png) Your challenge, if you chose…"
canonical: "https://www.baldengineer.com/eagle-trivia-challenge-why-the-ratnest.html"
author: "James Lewis"
date: "2014-01-05T12:00:40Z"
lastmod: "2015-03-24T22:34:09Z"
categories: ["eagle-cad"]
tags: ["eagle","ground-plane","ratsnest"]
---

# EAGLE Trivia Challenge:  Why the ratnest?


[![EAGLE_GND_Plane_Ratsnest_Challenge](/wp-content/uploads/2014/01/EAGLE_GND_Plane_Ratsnest_Challenge-300x203.png)](/wp-content/uploads/2014/01/EAGLE_GND_Plane_Ratsnest_Challenge.png)
Your challenge, if you chose to accept it, is to determine why EAGLE is showing a ratsnet connection on the far left of the PCB layout. The pads shown with the yellow unrouted line are both GND. They are both surrounded by a ground plane, which is also connected to GND.

Hint: it isn't a bug and it is something many people might ignore by mistake.

Can't figure it out? Or you want to see if you got it? Use a [ROT-13 converter](http://www.rot13.com "ROT13 Converter") for the answer:
> **Note:** Gurer vf ab culfvpny pbaarpgvba orgjrra gur tebhaq cynar gung P9 naq 3I3\_CJE ner fvggvat ba. Fb juvyr gurl obgu unir n TAQ cynar ninvynoyr, gur cynarf nera'g pbaarpgrq!