Virtualbox guest as a firewall for lUbuntu host


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Question Virtualbox guest as a firewall for lUbuntu host

Using virtualbox, I am trying to use Alpine linux (guest) as a firewall for my lubuntu (host). My physical network card (NIC) is eth0.

ISP WAN -> Alpine linux (guest) -> lubuntu (host) LAN

I am trying to get the ip from my ISP DHCP server but I had no success. I know that in virtualbox I have to use bridged adapter in eth0.
But in AlpineLinux (guest) do I have to create a vlan? Thats where I get confused.

ISP WAN -> DHCP -> Alpine linux (guest)

I was able to do this with two PCs like this:

ISP WAN --> Alpine linux firewall (PC1) --> Lubuntu LAN (PC2)

But now I am trying to do it with just one PC using virtualbox like this:

ISP WAN --> Alpine linux firewall (PC1) (Guest) --> Lubuntu LAN (PC1) (Host)
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VIOMB(4)						   BSD Kernel Interfaces Manual 						  VIOMB(4)

NAME
viomb -- VirtIO memory ballooning driver SYNOPSIS
virtio* at pci? dev ? function ? viomb* at virtio? DESCRIPTION
virtio(4) defines an interface for efficient, standard, and extensible I/O between the hypervisor and the virtual machine. The viomb driver supports the virtio-compliant memory ballooning device. Memory ballooning works as follows: 1. The host operator requests a guest to return some amount of memory to the host (via e.g. Qemu monitor balloon command). 2. The hypervisor sends the request via VirtIO memory ballooning device. 3. The guest viomb driver requests allocation of that amount of physical memory from the NetBSD memory management system. 4. The viomb device tells the hypervisor the guest physical memory address of the allocated memory via VirtIO memory ballooning device. The sysctl node hw.viomb.npages shows the requested number of memory pages to return to the hypervisor, while hw.viomb.actual shows the actual number of memory pages that are already returned to the hypervisor. SEE ALSO
virtio(4), sysctl(8) Rusty Russell, IBM Corporation, Virtio PCI Card Specification, http://ozlabs.org/~rusty/virtio-spec/. HISTORY
The viomb device driver appeared in NetBSD 6.0. BUGS
The userland interface should be same as the Xen ballooning device. BSD
November 26, 2011 BSD

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