systemd: depend on networking-online.target

Related: SYS#6400
Change-Id: I29e547242b2ed1cfc4750c7d7e5f8636c2e8f3dc
diff --git a/contrib/systemd/osmo-gbproxy.service b/contrib/systemd/osmo-gbproxy.service
index 6655d91..1c63a25 100644
--- a/contrib/systemd/osmo-gbproxy.service
+++ b/contrib/systemd/osmo-gbproxy.service
@@ -1,5 +1,7 @@
 [Unit]
 Description=Osmocom Gb proxy
+After=network-online.target
+Wants=network-online.target
 
 [Service]
 Type=simple