diff --git a/docs/source/index.rst b/docs/source/index.rst
index 0ce3259e..45400a28 100644
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -11,6 +11,8 @@ Welcome to fabrictestbed-extensions's documentation!
    :caption: Contents:
 
 
+This is the tesxt to introduce you to FABlib!
+
 
 Indices and tables
 ==================
diff --git a/fabrictestbed_extensions/fablib/network_service.py b/fabrictestbed_extensions/fablib/network_service.py
index d352ba1b..15da8f19 100644
--- a/fabrictestbed_extensions/fablib/network_service.py
+++ b/fabrictestbed_extensions/fablib/network_service.py
@@ -106,11 +106,12 @@ def calculate_l2_nstype(interfaces=None):
         rtn_nstype = None
         if len(sites) == 1:
             rtn_nstype = NetworkService.network_service_map['L2Bridge']
-        elif basic_nic_count == 0 and len(sites) == 2 and len(interfaces) == 2:
-            #TODO: remove this when STS works on all links.
-            rtn_nstype = NetworkService.network_service_map['L2PTP']
-        elif len(sites) == 2  and basic_nic_count == 2 and len(interfaces) == 2:
-            rtn_nstype = NetworkService.network_service_map['L2STS']
+        #elif basic_nic_count == 0 and len(sites) == 2 and len(interfaces) == 2:
+        #    #TODO: remove this when STS works on all links.
+        #    rtn_nstype = NetworkService.network_service_map['L2PTP']
+        elif len(sites) == 2:
+            if len(interfaces) >= 2:
+                rtn_nstype = NetworkService.network_service_map['L2STS']
         else:
             raise Exception(f"Invalid Network Service: Networks are limited to 2 unique sites. Site requested: {sites}")
 
@@ -131,9 +132,12 @@ def validate_nstype(type, interfaces):
         """
         sites = set([])
         nics = set([])
+        nodes = set([])
         for interface in interfaces:
             sites.add(interface.get_site())
             nics.add(interface.get_model())
+            nodes.add(interface.get_node())
+
 
         # models: 'NIC_Basic', 'NIC_ConnectX_6', 'NIC_ConnectX_5'
         if type == NetworkService.network_service_map['L2Bridge']:
@@ -147,10 +151,25 @@ def validate_nstype(type, interfaces):
                 raise Exception(f"Network type {type} does not support interfaces of type 'NIC_Basic'")
 
         elif type == NetworkService.network_service_map['L2STS']:
-            if not len(sites) == 2:
-                raise Exception(f"Network type {type} must include interfaces from exactly two sites. {len(sites)} sites requested: {sites}")
+            exception_list = []
+            if  len(sites) != 2:
+                exception_list.append(f"Network type {type} must include interfaces from exactly two sites. {len(sites)} sites requested: {sites}")
+            if len(interfaces) > 2:
+                hosts = set([])
+                for interface in interfaces:
+                    node = interface.get_node()
+                    if interface.get_model() == 'NIC_Basic':
+                        if node.get_host() == None:
+                            exception_list.append(f"Network type {type} does not support multiple NIC_Basic interfaces on VMs residing on the same host. Please see Node.set_host(host_nane) to explicitily bind a nodes to a specific host. Node {node.get_name()} is unbound.")
+                        elif node.get_host() in hosts:
+                            exception_list.append(f"Network type {type} does not support multiple NIC_Basic interfaces on VMs residing on the same host. Please see Node.set_host(host_nane) to explicitily bind a nodes to a specific host. Multiple nodes bound to {node.get_host()}.")
+                        else:
+                            hosts.add(node.get_host())
+
+            if len(exception_list) > 0:
+                raise Exception(f"{exception_list}")
         else:
-            raise Exception(f"Invalid l2 network type: {type}. Please choose from {NetworkService.get_fim_l2network_service_types()} or None for automatic selection")
+            raise Exception(f"Unknown network type {type}")
 
         return True
 
diff --git a/fabrictestbed_extensions/fablib/node.py b/fabrictestbed_extensions/fablib/node.py
index dd19ccac..f0e975a0 100644
--- a/fabrictestbed_extensions/fablib/node.py
+++ b/fabrictestbed_extensions/fablib/node.py
@@ -241,6 +241,9 @@ def set_host(self, host_name=None):
         labels.instance_parent = host_name
         self.get_fim_node().set_properties(labels=labels)
 
+        #set an attribute used to get host before Submit
+        self.host = host_name
+
     def get_slice(self):
         """
         Gets the fablib slice associated with this node.
@@ -330,6 +333,11 @@ def get_host(self):
         :rtype: str
         """
         try:
+            try:
+                #If we set the host but have not yet submitted
+                return self.host
+            except:
+                pass
             return self.get_fim_node().get_property(pname='label_allocations').instance_parent
         except:
             return None
diff --git a/fabrictestbed_extensions/fablib/slice.py b/fabrictestbed_extensions/fablib/slice.py
index f3778ff1..bbe74216 100644
--- a/fabrictestbed_extensions/fablib/slice.py
+++ b/fabrictestbed_extensions/fablib/slice.py
@@ -537,7 +537,7 @@ def get_components(self):
                     return_components.append(component)
 
         except Exception as e:
-            print("get_components: exception")
+            print(f"get_components: exception {e}")
             #traceback.print_exc()
             pass
         return return_components
@@ -556,7 +556,7 @@ def get_network_services(self):
                     return_networks.append(NetworkService(slice = self, fim_network_service = net))
 
         except Exception as e:
-            print("get_network_services: exception")
+            print(f"get_network_services: exception {e}")
             #traceback.print_exc()
             pass
         return return_networks
@@ -578,7 +578,7 @@ def get_nodes(self):
             for node_name, node in self.get_fim_topology().nodes.items():
                 return_nodes.append(Node.get_node(self, node))
         except Exception as e:
-            print("get_nodes: exception")
+            print(f"get_nodes: exception {e}")
             #traceback.print_exc()
             pass
         return return_nodes