NAT/DHCP network setting support like VMWare does.

[AndCycle]

VMWare scenario

• VMWare Virtual Network Default
  • provide DHCP support at VMnet1/VMnet8 host interface
  • provide NAT support at VMnet8

we already got NAT support at VirtualBox, why bother?

well, because VirtualBox provide Direct NAT attach,
host can't connect to guest by NAT interface like VMWare does,
under VMWare, you can direct connect to guest that connect to NAT because they actually connect to the host interface that host knows where they are.

I do webapp develop with some firewall setting on VM,
and move it to production environment lately,

I want my guest can connect to internet to grab some web info,
and I have to access it's wan interface to test it.

if I wanna do this for VirtualBox,
it's simple under *nix environment, but pretty sucks under win32,

I used to work under my laptop with winXP,
the only DHCP/NAT in it is ICS(Internet Connection Sharing),
it sucks, it have to assign which interface as wan and which as lan,
it has bad DHCP ip range default that you have to change it from registry,
it won't auto switch with default routing when I roaming between wire/wireless internet.

that's why I want to have VMWare like NAT host interface support,
I only have to bridge it with VirtualBox host interface once, then everything will works like a charm.