Static IP Error (Truenas CORE Version: TrueNAS-13.0-U6.2)

TrueNAS General
1

Hi All

I added a 2.5Gb NIC to my system (which has a built in 1Gb NIC). (The built in NIC has NOT been disabled through the BIOS).

No problems getting the new NIC to work - I used the DHCP option and an IP was allocated. (192.168.31.140)

Now that I’ve switched over to the 2.5Gb I want to change the DHCP IP to a static IP (I want to use the same IP address as allocated by DHCP).

When I attempted to make this change to a static IP I used the Network/Interface/ select the NIC / EDIT - this is the error message that came back…

“The network 192.168.31.0/24 is already in use by another interface.”

After doing so digging around I get this result from netstat -rn

root@XXXXXX[~]# netstat -rn
Routing tables

Internet:
Destination        Gateway            Flags     Netif Expire
default            192.168.31.1       UGS        igc0
127.0.0.1          link#2             UH          lo0
192.168.31.0/24    link#1             U          igc0
192.168.31.140     link#1             UHS         lo0

The IP (192.168.31.0/24) is listed.

Can anyone explain why this IP is listed, how it possible “got there” and how can I delete it.

The NIC I am using is shown as “igc0” on the network/interface screen.

The active NIC connection I am using the is 192.168.31.140 - which is listed as lo0.

Thank you for your help.

2

You can’t use the 192.168.31.0 address range on both NICs.

Are you trying to use both NICs or just one?

3

Thank you for your reply.

I am only using 1 NIC - the 192.168.31.140 (2.5gb) NIC.

I am NOT using the Mobo NIC. I have not as yet disabled it.

I did not “set” the 192.168.31.0 IP - this IP seems to have been set by the “system”. That’s what I’m “fighting” with - I didn’t set the .0 IP and I don’t know where to remove/delete this IP.

Thanks again for your reply.

4

I assume that it got there because it’s the subnet containing the present address of the NIC on the motherboard, and you were using it until you added the new one.

I suggest that you disable in the BIOS the NIC that you are not using. You cannot have two NICs on the same subnet as was earlier pointed out.

5

Thank you for your response. I’ll take your suggestion and disable the mobo NIC.

6

I realised what was causing the “problem” - I had not deleted the NIC information for the motherboard NIC. (I had actually disabled it - despite what I said above - I thought I hadn’t as yet disabled it)

In effect I had two NICs - albeit that the onboard NIC was not being used (not plugged in).

I deleted the onboard NIC device in Network/Interfaces and then I was able to change the new 2.5GB NIC from DHCP to a static IP.

Thank you for all advice and suggestions.