> Source: [sk88700](https://support.checkpoint.com/results/sk/sk88700)

# sk88700 - Creating VLAN interfaces on physical interface, which already has an assigned IP address in SecurePlatform OS / Gaia OS

| Property | Value |
|----------|-------|
| Solution ID | sk88700 |
| Date Created | 2012-11-28 |
| Last Modified | 2018-08-29 |
| Technical Level | General |
| Products | Security Gateway, Security Management Server |
| Versions | R82.10, R82, R81.20, R82.10, R82, R81.20, R82.20 |
| OS | Gaia |

## Solution

In SecurePlatform OS / Gaia OS, it is **mandatory**to remove an IP address from a physical interface before creating any VLAN interfaces on that physical interface.

**Removing IP Addresses from Physical Interfaces - SecurePlatform**

Before you define a VLAN, make sure the physical interface does not have an IP address:

1. Start the SecurePlatform configuration utility: sysconfig
2. Select "Network Connections".
3. For each interface:  

   1. Select "Configure connection".
   2. Select the physical interface.
   3. Select "Remove IP from interface".
   4. Return to Network Connections.

4. Exit the SecurePlatform configuration utility.

**Removing IP Addresses from Physical Interfaces - Gaia**

**In CLI run:** delete interface "interface name" ipv4-address

**In WebUI:**

1. Select 'Network Management \> Network Interfaces.
2. Select desired interface and click "Edit".
3. In IPv4 tab, highlight value and delete it.

For more information, refer to [Gaia R77 Administration Guide](https://sc1.checkpoint.com/documents/R77/CP_R77_Gaia_AdminWebAdminGuide/html_frameset.htm).

**Note:** Adding an IP address to the physical interface after defining a VLAN may cause connectivity issues in specific scenarios, and is Not supported.

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