Cloning MX Catch 22 - Can't update Addressing or DHCP

[mrfixit]

Hi, all, I just cloned a new small MX from an existing working small MX and I'm going through the pages creating the new network.

On the Addressing and VLAN page, when I update a VLAN, I get:

There were errors in saving this configuration:

• The first IP address 10.154.99.1 is not in the subnet 10.188.99.0/24.
• The last IP address 10.154.99.49 is not in the subnet 10.188.99.0/24.

So I go to the DHCP page and make an update there. Then I get:

There were errors in saving this configuration:

• The first IP address 10.188.99.1 is not in the subnet 10.154.99.0/24.
• The last IP address 10.188.99.49 is not in the subnet 10.154.99.0/24.

We have a bunch of VLANs and subsequently a bunch of DHCP servers.

I have tried changing DHCP Client addressing to: "Do not respond to DHCP requests", but still the same errors.

How can I change the second octet on all my entries in Addressing and DHCP without having to start from scratch?

Thank you.

[mrfixit]

So, I think I found the "why" in this problem. In the GUI, these functions are on two different pages: Addressing & VLANs and DHCP. But, in the API, these two sections are one function: updateNetworkVlan:

{
    "id": 99,
    "networkId": "xxxxxxxxxxxxx",
    "name": "xxxxxxxxxxxxx",
    "applianceIp": "10.154.99.1",
    "subnet": "10.154.99.0/24",
    "fixedIpAssignments": {},
    "reservedIpRanges": [
        {
            "start": "10.154.99.1",
            "end": "10.154.99.49",
            "comment": "Reserved Range"
        }
    ],
    "dnsNameservers": "x.x.x.x\nx.x.x.x.x",
    "dhcpHandling": "Run a DHCP server",
    "dhcpLeaseTime": "1 day",
    "dhcpBootOptionsEnabled": false,
    "dhcpOptions": []
}

Updating via API works as expected as I can change all of the second octets. But is there a way to change these addresses in the portal without getting an error? Thank you.