doc: update iso installation page with new cluster cidr and dhcp settings

docs/install/harvester-configuration.md

@@ -73,6 +73,9 @@ install:
   vip: 10.10.0.19
   vip_hw_addr: 52:54:00:ec:0e:0b
   vip_mode: dhcp
+  cluster_pod_cidr: 10.52.0.0/16
+  cluster_service_cidr: 10.53.0.0/16
+  cluster_dns_ip: 10.53.0.10
   force_mbr: false
   addons:
     harvester_vm_import_controller:
@@ -728,6 +731,57 @@ install:
   vip_hw_addr: 52:54:00:ec:0e:0b
 ```
 
+### `install.cluster_pod_cidr`
+
+**Definition**: CIDR of the Harvester pods.
+
+Use this field to override the default pod CIDR of 10.52.0.0/16.
+
+**Example**:
+
+```yaml
+install:
+  cluster_pod_cidr: 172.16.0.0/16
+```
+
+### `install.cluster_service_cidr`
+
+**Definition**: CIDR of the Harvester services.
+
+Use this field to override the default service CIDR of 10.53.0.0/16.
+
+:::info important
+
+If you change this CIDR, you must ensure that the cluster DNS IP (`install.cluster_dns`) is within this range.
+
+:::
+
+**Example**:
+
+```yaml
+install:
+  cluster_service_cidr: 172.22.0.0/16
+```
+
+### `install.cluster_dns`
+
+**Definition**: IP of the Harvester DNS service.
+
+Use this field to override the default DNS service IP of 10.53.0.10.
+
+:::info important
+
+This IP must be within the range defined by the `cluster_service_cidr` field.
+
+:::
+
+**Example**:
+
+```yaml
+install:
+  cluster_dns: 172.16.0.10
+```
+
 ### `install.webhooks`
 
 **Definition**: Webhooks that allow you to receive notifications for certain installer-related events.

docs/install/iso-install.md

@@ -87,17 +87,37 @@ The following [video](https://youtu.be/X0VIGZ_lExQ) shows a quick overview of an
 	For more information, see [DHCP Server Configuration](./pxe-boot-install.md#dhcp-server-configuration).
 	:::
 
+1. (Optional) Configure the CIDRs for the cluster pods and services.
+
+    If you want to use the default values, leave the fields blank.
+
+    ![config-cluster-cidrs.png](/img/v1.5/install/config-cluster-cidrs.png)
+
+    :::info important
+
+    The CIDR values must not overlap and must be within the private IP address range of 10.0.0.0/8, 172.16.0.0/12, or 192.168.0.0/16.
+
+    The DNS service IP must be within the range defined by the **Service CIDR** field.
+
+    :::
+
+    Example of a valid CIDR configuration:
+
+    - **Pod CIDR**: 172.16.0.0/16
+    - **Service CIDR**: 172.22.0.0/16
+    - **Cluster DNS IP**: 172.22.0.10
+
 1. (Optional) Configure the `DNS Servers`. Use commas as a delimiter to add more DNS servers. Leave it blank to use the default DNS server.
 
 	![config-dns-server.png](/img/v1.2/install/config-dns-server.png)
 
 1. Configure the virtual IP (VIP) by selecting a `VIP Mode`. This VIP is used to access the cluster or for other nodes to join the cluster.
 
 	:::note
-	If using DHCP to configure the IP address, you need to configure a static MAC-to-IP address mapping on your DHCP server to have a persistent virtual IP (VIP), and the VIP must be unique.
+	For DHCP setup with static MAC-to-IP address mappings configured, enter the MAC address in the provided field to fetch the unique persistent virtual IP (VIP). Otherwise, leave it blank.
 	:::
 
-	![config-virtual-ip.png](/img/v1.2/install/config-virtual-ip.png)
+	![config-virtual-ip.png](/img/v1.5/install/config-virtual-ip.png)
 
 1. Configure the `Cluster token`. This token is used for adding other nodes to the cluster.