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Multiple Network Questions

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Hello everyone. First off I'd like to say thanks for any help and tips given.

So I'm having several issues and/or problems I'm encountering with setting up my network. I'm reaching the boundaries of my network knowledge so please be patient with me on some of these issues. I obviously want to make my network as secure as possible but I'm not 100% sure on how to go about doing that. All Servers and the ASG are run on VMs.

1. I have a domain name that I would like to use for my web and eMail address. I'm going to set it up like so: domain.com and mail.domain.com. Can I get away with just using my ASG with my one static public IP and routing the web and mail traffic to the servers using private IPs or do each of the servers need a static public IP as well? I'm thinking that I could somehow use DNAT/SNAT for this issue. I currently have one public static IP but I can get four more for $5 more a month.

2. What is the proper way to set up an eMail server to pass through the ASG? I looked through the KB but I didn't see any info. I believe I have the Mail Security portion set up properly. I'm assuming a web server works the same minus the Mail Security settings. DNAT/SNAT probably solves this issue as well.

3. I have set up a Remote Access L2TP over IPSEC VPN, I've never used or set up a VPN before. I have a 4G phone that I was testing out remote activity. When I tried to load Google in the browser it timed out. So I downloaded the Speedtest.net app to conduct a few speed tests and these are the results; 4G no VPN: ~19 down/~8 up, 4G with VPN: no ping response even after restarting the app to search for a different server. The app doesn't even find a server after I restart it. The VPN connection takes but a few seconds to establish.

4. I would like to have people VPN and be able to play on my Minecraft server. Is there some way that I could set up a rule to allow a VPN user to access only one computer on the network? I don't want the users to be able to snoop around, I don't think these guys would but better safe than sorry.

5. Out of curiosity. When I run a speedtest with a computer hooked up through my wireless router plugged directly into the modem I get ~75 down/~10 up. However, when I run a computer hooked up to my managed switch that is goes through my ASG I get ~60 down/~7 up. Is that a configuration problem on the ASG or could it be due to the fact that I run the ASG through a VM or maybe a network configuration issue or...?

Hopefully Useful Information:

Network set up:
ISP IP Gateway/Modem -> ASG WAN -> ASG LAN -> Linksys SRW2024 Switch -> LAN VMs and Computers
I have a business line with one public static IP assigned from my ISP.

Computer running the VMs:
2x AMD 6272
64GB RAM
10 Ethernet Ports
Ubuntu Desktop 10.04
VMware Workstation 8.?

ASG 8.305 HOME VM:
6 cores allocated
3GB RAM

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