remove condition for associated network when !specifyvlan in shared network

    revert part of #10168

Author: DaanHoogland

server/src/main/java/com/cloud/network/NetworkServiceImpl.java

@@ -1635,10 +1635,19 @@ public Network createGuestNetwork(CreateNetworkCmd cmd) throws InsufficientCapac
             throwInvalidIdException("Network offering with specified id doesn't support adding multiple ip ranges", ntwkOff.getUuid(), NETWORK_OFFERING_ID);
         }
 
-        if (GuestType.Shared == ntwkOff.getGuestType() && !ntwkOff.isSpecifyVlan() && Objects.isNull(associatedNetworkId)) {
-            throw new CloudRuntimeException("Associated network must be provided when creating Shared networks when specifyVlan is false");
-        }
 
+
+        if (GuestType.Shared == ntwkOff.getGuestType()) {
+            if (!ntwkOff.isSpecifyIpRanges()) {
+                throw new CloudRuntimeException("The 'specifyipranges' parameter should be true for Shared Networks");
+            }
+            if (ipv4 && Objects.isNull(startIP)) {
+                throw new CloudRuntimeException("IPv4 address range needs to be provided");
+            }
+            if (ipv6 && Objects.isNull(startIPv6)) {
+                throw new CloudRuntimeException("IPv6 address range needs to be provided");
+            }
+        }
         Pair<Integer, Integer> interfaceMTUs = validateMtuConfig(publicMtu, privateMtu, zone.getId());
         mtuCheckForVpcNetwork(vpcId, interfaceMTUs, publicMtu);