diff --git a/tools/vm/ubuntu1604/30_docker.sh b/tools/vm/ubuntu1604/30_docker.sh
index 332a03dfb..d393133e4 100755
--- a/tools/vm/ubuntu1604/30_docker.sh
+++ b/tools/vm/ubuntu1604/30_docker.sh
@@ -54,8 +54,11 @@ while true; do
 done
 
 # Enable experimental features, for cross-building aarch64 images.
+# Enable Docker IPv6.
 cat > /etc/docker/daemon.json <<EOF
 {
-    "experimental": true
+    "experimental": true,
+    "fixed-cidr-v6": "2001:db8:1::/64",
+    "ipv6": true
 }
 EOF