reject_plan.diff

diff --git a/nomad/structs/network.go b/nomad/structs/network.go
index 30e769323..3f7f1c8be 100644
--- a/nomad/structs/network.go
+++ b/nomad/structs/network.go
@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"math/rand"
 	"net"
+	"os"
+	"strings"
 	"sync"
 
 	"github.com/hashicorp/nomad/helper"
@@ -174,6 +176,9 @@ func (idx *NetworkIndex) Overcommitted() bool {
 // SetNode is used to setup the available network resources. Returns
 // true if there is a collision
 func (idx *NetworkIndex) SetNode(node *Node) (collide bool, reason string) {
+	if os.Getenv("CRASH") != "" && strings.HasPrefix(node.Name, "crash") {
+		return true, "crash"
+	}
 
 	// COMPAT(0.11): Remove in 0.11
 	// Grab the network resources, handling both new and old