No GUI and no Lan access

[Mr_G]

The OPNsense is installed on a mini PC with 4 Ethernet ports. I can boot it and use the video out on it to see that I have internet to it and an Ip address. No Lan connection from it but it shows the IP I set?

[Mr_G]

After more testing it’s a double Nat issue, the router required by ISP has the same default Lan address. Can another router be added in between them be used to solve the issue? And yes I tried changing the Lan IP on the opnsense firewall. Still no Lan connection

[Patrick M. Hausen]

You can hook up WAN of your OPNsense to your ISP router and simply change the LAN network of OPNsense via console to something different from 192.168.1.0/24.

[Mr_G]

Thanks for the reply,
But unfortunately I did that and it didn’t work

[Patrick M. Hausen]

Please describe in detail the steps you took and what did not work.

[Mr_G]

With the first install of opnsense 23.1 I wasn’t able to load the GUI on the LAN 192.168.1.1 or 192.168.1.0, with my windows pc. Then I rebooted it same issue again. Next I set the Lan to 10.10.10.1 and was unable to open the GUI at that address as well. Next I rebooted the upstream router no improvement. Next I rebooted both the upstream router and the opnsense PC, no GUI, just to be sure I reinstalled opnsense. That didn’t fix it, setting my CR1000 the upstream router to bridge mode just crashed it, no I’m with a new install with the Wan set to A0 and the Lan A1-3, automatic ip settings. There is an internet connection to the Opnsense PC I can ping it’s console.

[Patrick M. Hausen]

How and to which port did you connect the PC? Did you connect the PC to the LAN port (the first one) of your OPNsense and not connect the OPNsense to anything else? Did you set your PC to DHCP?

In that case invoking the UI at 192.168.1.1 must work.

After changing the IP address of LAN to 10.10.10.1, did you (again) connect your PC to LAN? And manually configure the PC to e.g. 10.10.10.2, because after the change of the interface address on OPNsense the DHCP server would not match, anymore?

Still this is way too little information about what is connected where, what has got which IP address etc.

You cannot connect your PC to your home router, the OPNsense to the same home router, and expect to get anywhere. The PC must be connected to LAN of OPNsense. Then we can take further steps.

[Mr_G]

The WAN is set to plug label A0, that was and is the input from the mean router. LAN’s are A1, A2, A3, unfortunately I just get no response from ip 192.168.1.1 on the LAN A1 or the other two. My PC has both DHCP and IPV4 on. Could you recommend a good book on networking?

My network:

Home router> switch > opnsense > windows PC

[Patrick M. Hausen]

If the interfaces of whatever hardware you are using are labelled A0, A1, A2 and A3, then I'd expect that these are the first, second, third and fourth interface as seen by OPNsense. Do you agreee?

And LAN is the first interface and WAN is the second, not the other way round.

This is how every single freshly installed OPNsense is set up. First port is LAN.

[chemlud]

...

And LAN is the first interface and LAN is the second, not the other way round.

....

***cough***

[Mr_G]

Yes it sets the LAN first, I set A1, A2, A3 not A0, then it asks me to set the WAN that’s is A0. So the LAN is supposed to be first? Then that would make the WAN A3? If I set it up
That way.

[Patrick M. Hausen]

...

And LAN is the first interface and LAN is the second, not the other way round.

....

***cough***

Sorry, fixed the original post.

[Patrick M. Hausen]

@Mr_G you do a fresh install. You boot. You do not touch anything. You connect a PC to the first port which is most probably A0 in your case. You will get an IP address for the PC and you will be able to connect to the UI.

Once you got that settled, we can proceed.

Sorry about the typo with 2x LAN (and in bold, OMG  )

[Mr_G]

The interfaces have been reset, no it’s Lan A0, A1, A2, and WAN A3. No connection to it on LAN A0. Connect it to home router on WAN A3, still no LAN connection.. rebooting now no LAN connection. LAN address is 192.168.1.1,

[Mr_G]

Windows diagnostic says Ethernet doesn’t have a valid IP address