diff --git a/test/100_cross_hosts_test.sh b/test/100_cross_hosts_test.sh
index 869be0ec..6d2e4875 100755
--- a/test/100_cross_hosts_test.sh
+++ b/test/100_cross_hosts_test.sh
@@ -4,12 +4,14 @@
 
 C1=10.2.1.4
 C2=10.2.1.7
-UNIVERSE=10.2.2.0/24
+UNIVERSE=10.2.0.0/16
+SUBNET_1=10.2.2.0/24
+SUBNET_2=10.2.3.0/24
 
 start_suite "Ping over cross-host weave network (with and without IPAM)"
 
-weave_on $HOST1 launch -iprange $UNIVERSE
-weave_on $HOST2 launch -iprange $UNIVERSE $HOST1
+weave_on $HOST1 launch -iprange $UNIVERSE -ipsubnet $SUBNET_1
+weave_on $HOST2 launch -iprange $UNIVERSE -ipsubnet $SUBNET_1 $HOST1
 
 start_container $HOST1 $C1/24 --name=c1
 start_container $HOST2 $C2/24 --name=c2
@@ -20,4 +22,9 @@ start_container $HOST2 --name=c4
 C4=$(container_ip $HOST2 c4)
 assert_raises "exec_on $HOST1 c3 $PING $C4"
 
+start_container $HOST1 --subnet $SUBNET_2 --name=c5
+start_container $HOST2 --subnet $SUBNET_2 --name=c6
+C6=$(container_ip $HOST2 c6)
+assert_raises "exec_on $HOST1 c5 $PING $C6"
+
 end_suite