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hacking: security in practice
Is it possible to host a virtual machine on a network but make it so only a specific computer can access it?

Hi. Let me explain.

So, I have a sort of home lab setup (in a sense) that I designed for vulnhub boxes. Essentially, I have an attacking laptop and a desktop computer which I'm using as a server to host the vulnerable boxes. Ideally, I was going to simply connect the two computers together via ethernet and a switch, and just having the VMs listen on the isolated eth0 interface while the server itself gets Wi-Fi connectivity from wlan0.

The issue with this, though, is that upon connecting everything together I forgot that DHCP (to my knowledge) doesn't work with a routerless environment like this, which really throws a wrench in my plan since the only way for me to statically assign an IP address to a VM is if I have the login credentials. Which of course, in order to get the login credentials, it would require me to ironically skip the challenge just so I could play the challenge.

I also thought about connecting the VMs on my wlan0 interface but assigning a firewall with a whitelist (since having a vulnerable box float around on your internal network doesn't sound like a particularly nice idea), but I then ran into that same problem of not really being able to set up the firewall without first having login credentials. Infact, I can't really do much of anything for that matter when it comes to networking.

Because of this I'm in a bit of a pickle. If it turns out that there's really no solution then I'm okay with doing the standard internal network setup with an attacker VM and the vulnerable VM. However, while I'm not going to get into the reasons specifically, I'd like to atleast know if it's possible for a setup like this to even be possible before I throw in the towel and go the "Plan B" route previously mentioned.

Sorry if this post sounds very rambly and incoherent as I'm a bit tired while writing this. Perhaps there's a solution I'm too fogged up to understand but for the moment I'm stumped.

submitted by /u/TheByteQueen
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