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I have next setup:

My home lan = 192.168.1.0/24

My virtual lan = 192.168.207.0/24

My laptop = 192.168.1.109 (dhcp OS=Windows7)

My desktop = 192.168.1.206 (fixed ip OS=Windows8)

My virtual machine installed on the desktop = 192.168.207.128 (NAT + dhcp OS=Linux Mint)

Ping from virtual machine 192.168.207.128 works to all.

Ping from workstation 192.168.1.206 to vm 192.168.207.128 works.

Ping from laptop 192.168.1.109 to desktop 192.168.1.206 works.

Ping from laptop 192.168.1.109 to vm 192.168.207.128 FAILS.

Ping from laptop 192.168.1.109 to vm def gw 192.168.207.1 FAILS.

VM is in nat mode. I know this will be easier in bridged mode. But I want to make it work in NAT mode if possible.

I found 3 reasons for this to fail. And I applied what was necessary (I thought, but without success...).

1/ NAT needs port forwarding. So in the vm network settings I did port-forwarding. Settings are: 'port 22' and 'vm ip address 192.168.207.128' 'type TCP'.

2/ Windows firewall on my desktop can cause problems, so I disabled Windows 8 fw.

3/ My laptop does not know a route to that network 192.168.207.0. So I added a static route in Win7 like this in command line: [route add 192.168.207.0 mask 255.255.255.0 192.168.1.206 metric 1]

Many thanks for your help, or some advice.

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  • How is forwarding port 22 supposed to make ping work? It would also help a lot if you explained why you are using NAT mode.
    – David Schwartz
    Commented Oct 21, 2014 at 22:14
  • Hi David. Port 22 was ment for the ssh connection. Why I want to use NAT mode is just for the challenge. I wanted to do some experiments. Beginner networking.
    – maxim
    Commented Oct 22, 2014 at 6:46

1 Answer 1

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You are asking your Desktop PC to become a router between the 192.168.1.x network and the 192.168.207.x network.

Windows doesn't do this automatically, it needs to be enabled. Go to Start, then type services.msc in the run box.

Open services, and find the Routing and Remote Access service. It will be disabled. Go to the properties of the service, enable it and start it (automatically if you wish).

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  • Hello Paul. Thank you for your input. I'll try this at home this evening.
    – maxim
    Commented Oct 22, 2014 at 6:49
  • @max You accepted - did it solve the problem or was sonething else needed?
    – Paul
    Commented Oct 23, 2014 at 7:04
  • Hi Paul. I found your service. It's well explained how to get there. The only problem is that I receive an error when activating that service. I'm changing my plan here and will go through 'bridged' mode. Like I said to David, it was just for a test. Also I'm not sure I want my desktop pc to function as a router. Anyway thanks having clarified this for me.
    – maxim
    Commented Oct 23, 2014 at 7:08

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