start network topology reference

howto/new-machine-cymru.md

@@ -425,6 +425,21 @@ documentation](https://www.dell.com/support/manuals/en-ca/idrac7-8-lifecycle-con
  * [Integrated Dell Remote Access Controller](https://www.dell.com/support/manuals/ca/en/cabsdt1/integrated-dell-remote-access-cntrllr-7-v1.50.50/idrac7ug1.50.50-v1/overview)
  * [iDRAC 8/7 v2.50.50.50 RACADM CLI Guide](https://www.dell.com/support/manuals/ca/en/cabsdt1/idrac7-8-lifecycle-controller-v2.50.50.50/idrac_2.50.50.50_racadm/introduction?guid=guid-6b6564ab-ee63-49ef-a7d6-47154c343841&lang=en-us)
 
+# Reference
+## Network topoloy
+
+TODO. expand this.
+
+ * vlan 82 - front end: 38.229.82.0/24. 
+
+ * vlan 801 - backend/management.  Currently 10.10.1.0/24.  This vlan
+   is isolated.
+
+ * vlan 802 - storage/iscsi network.  10.10.2.0/24.  This vlan is
+   isolated.  Dedicated storage network.  The storage devices will
+   live on vlan 801 for management and vlan 802 for storage
+   connectivity (iscsi traffic).
+
 # Discussion
 
 ## Disabling the builtin RAID controller