---
title: "Changing Network Configuration"
slug: "changing-network-configuration"
updated: 2026-10-27T17:23:45Z
published: 2026-10-27T17:23:45Z
canonical: "docs.vastdata.com/changing-network-configuration"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vastdata.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Changing Network Configuration

VMS enables you to change some of the network configuration parameters of a working cluster from the VAST Web UI.

Limitations:

- This feature is not supported for clusters that have any CNodes that are connected simultaneously to multiple separate client data networks.

1. From the left navigation menu, click Settings and then Configure Network.
2. Change the settings as needed:

| VMS IP | The IP address configured on the management interfaces on all CNodes. VAST Management Service (VMS) listens on this IP. The IP should be on the management subnet. This parameter is originally set by the Management VIP field in the *Easy Install* interface or the `--mgmt_ip` parameter in the `configure_network.py` script. |
| --- | --- |
| NTP | The IP(s) of up to two NTP server(s) that you want to use for time keeping. |
| Default GW | The IP address of the default gateway for the management network. |
| DNS | The IP address(es) of up to two DNS servers that will forward DNS queries to the cluster. |
| External Netmask | The subnet mask of the management subnet. |
| IPMI Gateway | The IP of a default gateway for the IPMI interfaces on the CNodes and DNodes, if different from the management network default gateway. |
| IPMI Netmask | The subnet mask for the IPMI gateway. |
| External (MGMT IPs) +MTU definitions | Click in the field to reconfigure the IPs of the external management interfaces on any or all of the nodes and associated configurations such as MTU. A list of all CNodes and DNodes in the cluster appears. You can click in the columns provided to change the following settings per node: - External Eth MTU. For dual-NIC CNodes where a NIC is directly connected to an external Ethernet network, use this field to set the MTU for that Ethernet network. - External IB MTU. For dual-NIC CNodes where a NIC is directly connected to an external InfiniBand data network, use this field to set the MTU for that InfiniBand network. Default: 2044 - If *NB IB type* is *Connected*, the maximum IB NB MTU is 65520. - If *NB IB type* is *Datagram*, the maximum IB NB MTU is 4092. - Mgmt IP. Changes the management IP of the node. - IPMI IP. Changes the IPMI IP of the node. |
| Auto-ports-ext-iface | Reallocates the external management IP to an interface: - Outband. Allocates the external management IP to the onboard left or right port, depending whether B2B is enabled or not. - Inband. Allocates the external management IP to the *bond0* interface. - Bond. Creates a bond interface (*bond1*) on the two RJ45 ports, allowing for redundancy. Negates the ability to have a technician interface. - Northband. For clusters with dual NIC CNodes where one NIC is directly connected to an external client network, this option allocates the external management IP to the first port on the NIC that was allocated for external usage. |
| B2B - IPMI | Enables auto configuring the IPMI ports on the nodes with IP addresses according to the B2B template. |
3. Click Validate data in order to save.
4. Review the summary of configuration changes.

If you need to make any changes, click Back to Edit the Values, change them and click Validate data in order to save again.
5. When you are sure you want to go ahead with the changes, click Approve & Save Pending Changes.