Network Ubuntu Host, Windows guest; phones, tablets on LAN; port 80 and ping fail outside the host

[AnnVirtual]

Hi.

I recently upgraded to Ubuntu 18.04 on my host machine, a Dell laptop.
I have a Windows 10 guest running IIS, with ports 80 and 443 open.
I have VirtualBox installed on the Ubuntu Host: VirtualBox Graphical User Interface Version 5.2.10_Ubuntu r121806.

The Windows guest VM is configured with Bridged networking.

The host connects with Wifi to a 192.168.43.x subnet.

Testing PING or testing http or https from within Windows, or from the Host browser, all work. PING receives a reply. HTTP and HTTPS responses all work.

The problem is with other devices on the LAN. All devices physically separate from the host (yet on the same LAN Wifi ) fail to PING, fail to get HTTP, fail to get HTTPS. I have tested on the ipv4 numbers directly to avoid any DNS issues. e.g. ping 192.168.43.12 or https://192.168.43.12/robots.txt

I have the correct/latest guest additions installed in the guest VM.

I am certain I had this bridged network working "not too long ago." However both the OS Ubuntu changed from 16.04 to 18.04, and VirtualBox itself was upgraded recently (to the latest). The wifi router is the same in recent months. No hardware changes.

I am fairly familiar with NAT and port forwarding but I do not want to use that unless it is necessary.

In terms of the Ubuntu firewall, I installed Gufw and opened port 80 and turned the firewall off. Nothing made a diference.
In the guest Windows network, only the default Windows defender is active and it has the relevant ports open.

I am out of ideas and would really appreciate some guidance.

Thank you.

[andyp73]

VirtualBox Graphical User Interface Version 5.2.10_Ubuntu r121806

This is the Ubuntu "tribute act" version of VirtualBox and is supported by the folks at Ubuntu. You should completely remove that from your system and install the latest version (currently 5.2.22) from the Linux Downloads page. If you still have problems then this is the correct place for support.

Bridged networking to Wi-Fi is outside of the specification and there is no guarantee that it will work. Whether it will or not is down to a combination of which Wi-Fi adapter, access point and drivers you have. Do you have the ability to use a wired adapter to prove that everything else works correctly?

-Andy.

[AnnVirtual]

Thank you for noticing the "tribute act" version detail. I did not realize how different that was. I have uninstalled 5.2.10_Ubuntu and put in the one from Downloads. Now Help > About says Version 5.2.22 r126460 (Qt5.9.5).

I installed the new guest additions and rebooted the Windows guest.

The problem remains.

Changing to a wired connection is non-trivial but it is possible and I could give that a try within the next day or so.

Under the VM network choices, there are only 2 Adapter Name choices. 1 choice always works (ping 192.168.43.1 from the guest works), the other always fails ( request timed out ). Under the Virtual Box Manager, File > Preferences > Network, I do not have any NAT network definitions.

Is there an easy Ubuntu way to determine the spec of my laptop's network card, and then to see whether there is some updated driver for it?

Ann