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Virtualbox guest as a firewall for lUbuntu host

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Special Forums Cybersecurity Virtualbox guest as a firewall for lUbuntu host
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Old 12-23-2015
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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LEARN ABOUT OSX

pdb_odsam

PDB_ODSAM(8)															      PDB_ODSAM(8)

NAME

       pdb_odsam - Open Directory account information database for smbd

SYNOPSIS

       The  pdb_odsam  plugin  is  the	default  account information database backend used on Mac OS X. It makes users and groups record from Open
       Directory available to Samba.

       idmap_odsam should always be used in conjunction with the odsam passdb backend.

OPTIONS

       odsam: map guest to guest = BOOL
	      If this is true (the default), pdb_odsam map the literal username "guest" to the configured guest account.  This	makes  "guest"	an
	      alias for the configured guest account regardless of whether an account named "guest" exists or not.

       odsam: msglevel = LEVEL
	      LEVEL is the integer log level at which pdb_odsam should emit log messages.  The lower LEVEL is, the more verbose the log messages.

       odsam: traceall = BOOL
	      If  this	is  true,  pdb_odsam  will  emit log messages for all Open Directory calls. If it is false (the default), it will only log
	      errors.

EXAMPLES

	    [global]
		idmap domain = default
		idmap config default:default = yes
		idmap config default:backend = odsam

		idmap alloc backend = odsam

		passdb backend = odsam

		odsam: msglevel = 0    # Log at debugging levels
		odsam: traceall = no   # Do not trace Open Directory calls

BUGS

       Please report bugs to Apple.

SEE ALSO

       DirectoryService(8), smb.conf(5), smbd(8)

																      PDB_ODSAM(8)