Windows 7 and Vista lab problem

Hey guys,
I am not sure if I can post this question in this section.

I setup a virtual lab for my MS certs. I am currently working on 70-680. I installed VirtualBox and installed my 7 x64, Vista x64 and Vistax86 on VB.

On the host machine, I have setup a loopback adapter with an IP add of, and no default-gateway.

The guest OSes have IP addresses of x64), x64), and x86).

I can ping the loopback adapter(, but the ping from guest OS to guest OS fails.

Any idea why?

My mistake I haven't fixed it yet. I thought I did.

Working on CCNA: Security. Start date: 12.28.10
Microsoft 70-640 - on hold (This is not taking me anywhere. I started this in October, and it is December now, I am still on page 221. WTH!)
Network Warrior - Currently at Part II
Reading IPv6 Essentials 2nd Edition - on hold
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