FTG dhcp server

[Koumbia]

Hello community,

I need yours help, when i make 

FortiGate-VM64-AWS (interface) #

edit port1

  set mode dhcp

then i getting this error

This interface is being used by one or more dhcp servers.
attribute set operator error, -236, discard the setting
Command fail. Return code 1

[Atul_S · Accepted solution]

Hello Koumbia,

As per your config and the error message, it seems like you are trying to set the port 1 as DHCP client whereas port 1 is configured to serve a DHCP pool within DHCP configuration. You either have to change the interface within DHCP setting or use another port as DHCP client.

Thanks,

[Debbie_FTNT · Accepted solution]

To elaborate a bit on Atul's comment:

- port1 is configured to work as DHCP server

- that means currently it provides IPs for connecting clients

- it must have a static IP itself to act as DHCP server

So, one of two options:

1. Delete any DHCP server under 'config system dhcp server' that references port1

-> any hosts connecting to port1 and receiving IPs from it might lose connection!

2. Leave port1 to have a static IP

Cheers,

Debbie

[DPadula]

Hi Koumbia

Download the Fortigate configuration, open it using notepad or notepad++ and search by port1.

See where port1 is used. You might need to fix/change some of the firewall configuration.

[Koumbia]

Thank you for your feedback, i don't understand why when i use 'set mode dhcp' and 'next' i have this error

[Atul_S · Accepted solution]

Hello Koumbia,

As per your config and the error message, it seems like you are trying to set the port 1 as DHCP client whereas port 1 is configured to serve a DHCP pool within DHCP configuration. You either have to change the interface within DHCP setting or use another port as DHCP client.

Thanks,

[DPadula]

Hi Kumbia,
Follow Atul's advice and probably you will find the issue. Just to add to his comment, the DHCP server settings can be found under 'conf system dhcp server'.

[Debbie_FTNT · Accepted solution]

To elaborate a bit on Atul's comment:

- port1 is configured to work as DHCP server

- that means currently it provides IPs for connecting clients

- it must have a static IP itself to act as DHCP server

So, one of two options:

1. Delete any DHCP server under 'config system dhcp server' that references port1

-> any hosts connecting to port1 and receiving IPs from it might lose connection!

2. Leave port1 to have a static IP

Cheers,

Debbie

[Koumbia · Accepted solution]

Thank you so much @Atul_S