diff --git a/site-modules/profile/manifests/network.pp b/site-modules/profile/manifests/network.pp
--- a/site-modules/profile/manifests/network.pp
+++ b/site-modules/profile/manifests/network.pp
@@ -1,4 +1,8 @@
-# Network configuration for Software Heritage servers
+# Network configuration for Software Heritage servers.
+
+# This class is enabled when the `networks` hiera variable returns a value that
+# is not empty.
+
 class profile::network {
   debnet::iface::loopback { 'lo': }
 
diff --git a/site-modules/role/manifests/swh_api.pp b/site-modules/role/manifests/swh_api.pp
--- a/site-modules/role/manifests/swh_api.pp
+++ b/site-modules/role/manifests/swh_api.pp
@@ -1,6 +1,4 @@
 class role::swh_api inherits role::swh_base_api {
-  include profile::network
-
   # Extra deposit and storage services
   include profile::swh::deploy::deposit
   include profile::swh::deploy::storage
diff --git a/site-modules/role/manifests/swh_base.pp b/site-modules/role/manifests/swh_base.pp
--- a/site-modules/role/manifests/swh_base.pp
+++ b/site-modules/role/manifests/swh_base.pp
@@ -14,5 +14,9 @@
     include profile::megacli
   }
 
+  if lookup('networks', {default_value => {}}) {
+    include profile::network
+  }
+
   include profile::swh
 }
diff --git a/site-modules/role/manifests/swh_deposit.pp b/site-modules/role/manifests/swh_deposit.pp
--- a/site-modules/role/manifests/swh_deposit.pp
+++ b/site-modules/role/manifests/swh_deposit.pp
@@ -1,6 +1,4 @@
 class role::swh_deposit inherits role::swh_server {
-  include profile::network
-
   # Web UI
   include profile::swh::deploy::deposit
 
diff --git a/site-modules/role/manifests/swh_forge.pp b/site-modules/role/manifests/swh_forge.pp
--- a/site-modules/role/manifests/swh_forge.pp
+++ b/site-modules/role/manifests/swh_forge.pp
@@ -1,6 +1,4 @@
 class role::swh_forge inherits role::swh_server {
-  include profile::network
-
   include profile::apache::rewrite_domains
 
   include profile::phabricator
diff --git a/site-modules/role/manifests/swh_gateway.pp b/site-modules/role/manifests/swh_gateway.pp
--- a/site-modules/role/manifests/swh_gateway.pp
+++ b/site-modules/role/manifests/swh_gateway.pp
@@ -1,3 +1,2 @@
 class role::swh_gateway inherits role::swh_base {
-  include profile::network
 }
diff --git a/site-modules/role/manifests/swh_sysadmin.pp b/site-modules/role/manifests/swh_sysadmin.pp
--- a/site-modules/role/manifests/swh_sysadmin.pp
+++ b/site-modules/role/manifests/swh_sysadmin.pp
@@ -1,6 +1,4 @@
 class role::swh_sysadmin inherits role::swh_server {
-  include profile::network
-
   include profile::prometheus::server
   include profile::grafana
 
diff --git a/site-modules/role/manifests/swh_worker_inria.pp b/site-modules/role/manifests/swh_worker_inria.pp
--- a/site-modules/role/manifests/swh_worker_inria.pp
+++ b/site-modules/role/manifests/swh_worker_inria.pp
@@ -1,3 +1,2 @@
 class role::swh_worker_inria inherits role::swh_worker {
-  include profile::network
 }