AETHER-3411 Persist network config across reboot

Change-Id: I295f55eeeab957189e151e1b746c9b856a1aac30
diff --git a/systemd/20-aiab-core.network b/systemd/20-aiab-core.network
new file mode 100644
index 0000000..39e7a53
--- /dev/null
+++ b/systemd/20-aiab-core.network
@@ -0,0 +1,13 @@
+# Copyright 2022-present Open Networking Foundation
+# SPDX-License-Identifier: Apache-2.0
+
+[Match]
+Name=core
+
+[Network]
+IPForward=yes
+Address=192.168.250.1/24
+
+[Route]
+Gateway=192.168.250.3
+Destination=172.250.0.0/16