diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 000000000..22442742f
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,21 @@
+[submodule "istio/1.12/api"]
+	path = istio/1.12/api
+	url = https://github.com/istio/api
+[submodule "istio/1.12/istio"]
+	path = istio/1.12/istio
+	url = https://github.com/istio/istio
+[submodule "istio/1.12/client-go"]
+	path = istio/1.12/client-go
+	url = https://github.com/istio/client-go
+[submodule "istio/1.12/pkg"]
+	path = istio/1.12/pkg
+	url = https://github.com/istio/pkg
+[submodule "istio/1.12/proxy"]
+	path = istio/1.12/proxy
+	url = https://github.com/istio/proxy
+[submodule "envoy/1.20/go-control-plane"]
+	path = envoy/1.20/go-control-plane
+	url = https://github.com/envoyproxy/go-control-plane
+[submodule "envoy/1.20/envoy"]
+	path = envoy/1.20/envoy
+	url = https://github.com/envoyproxy/envoy
diff --git a/envoy/1.20/envoy b/envoy/1.20/envoy
new file mode 160000
index 000000000..96701cb24
--- /dev/null
+++ b/envoy/1.20/envoy
@@ -0,0 +1 @@
+Subproject commit 96701cb24611b0f3aac1cc0dd8bf8589fbdf8e9e
diff --git a/envoy/1.20/go-control-plane b/envoy/1.20/go-control-plane
new file mode 160000
index 000000000..4dc61ebae
--- /dev/null
+++ b/envoy/1.20/go-control-plane
@@ -0,0 +1 @@
+Subproject commit 4dc61ebae957b68a2990e920023712a5630dba04
diff --git a/istio/1.12/api b/istio/1.12/api
new file mode 160000
index 000000000..8da52c66f
--- /dev/null
+++ b/istio/1.12/api
@@ -0,0 +1 @@
+Subproject commit 8da52c66ff2374748595198cb3b9c70327649df1
diff --git a/istio/1.12/client-go b/istio/1.12/client-go
new file mode 160000
index 000000000..b744b6f11
--- /dev/null
+++ b/istio/1.12/client-go
@@ -0,0 +1 @@
+Subproject commit b744b6f111e4b44b1866113111fe5d03f04196b4
diff --git a/istio/1.12/istio b/istio/1.12/istio
new file mode 160000
index 000000000..7009b147a
--- /dev/null
+++ b/istio/1.12/istio
@@ -0,0 +1 @@
+Subproject commit 7009b147ad29be32845ab6ddeb37e17efc2daafa
diff --git a/istio/1.12/pkg b/istio/1.12/pkg
new file mode 160000
index 000000000..e379f31ee
--- /dev/null
+++ b/istio/1.12/pkg
@@ -0,0 +1 @@
+Subproject commit e379f31ee62ae4cb42bb1952160dbd4fe1e19bf3
diff --git a/istio/1.12/proxy b/istio/1.12/proxy
new file mode 160000
index 000000000..4ad0eba4d
--- /dev/null
+++ b/istio/1.12/proxy
@@ -0,0 +1 @@
+Subproject commit 4ad0eba4dd5f63b10260495f263ab3971326b4f5