[Resolved] No connection between two guest in NAT network

[tnagdn]

Right now I have:

• Windows Server 2003 as DHCP Server (Static Address)
• IP: 10.0.2.10/24
• Netmask: 10.0.2.1

• Two Windows XP machines with dynamic addresses

The three machines inside a nat network with the following configuration

• 10.0.2.0/14
• Supported DHCP

Now, the clients are taking the desired addresses, but the problem is:

• Server can't ping the clients
• Clients can't ping between themselves
• Client can only ping the server

What am I doing wrong? Why can't the clients communicate?

[Martin]

Do have connected your guests to a new "NAT network" you have created for that purpose or are they just connected to "NAT"?

[tnagdn]

Hello Martin. All the machines are inside a "NAT Network", not simply "NAT"

[socratis]

Windows Server 2003 as DHCP Server (Static Address)

Why do you have two DHCP servers, one the NATservice and one your Win2003? There can will be a conflict there.

Are you trying by any chance to create an Active Directory? If so, that's a whole different setup and you will need (AFAIK) to have the Win2003 DHCP server active.

As far as pinging goes, make sure that the firewalls are down, or that at least the ICMP part is allowed.

Please post the output of the command:

• 
  VBoxManage list natnets

And the DHCP settings for the Win2003 DHCP server.

[tnagdn]

Hello socratis. Yeah I misunderstood the way VBOX DHCP works, already fixed it. So when I set up a DHCP server, I have to disable the DHCP support on VBOX?

Code: Select all

vboxmanage list natnets
NetworkName:    NatNetwork
IP:             10.0.2.1
Network:        10.0.2.0/24
IPv6 Enabled:   No
IPv6 Prefix:    fd17:625c:f037:2::/64
DHCP Enabled:   No
Enabled:        Yes
loopback mappings (ipv4)
        127.0.0.1=2

No I'm not trying to build an Active Directory, just want to create an internal NAT network with DHCP, FTP and DNS functions

Now it seems to work right after disabling the firewall, no idea why when in the past it worked right without disabling it

Thank you for your help!

[socratis]

So when I set up a DHCP server, I have to disable the DHCP support on VBOX?

Yes, otherwise I don't know which DHCP server will be the one to give an IP to the other guests.

Now it seems to work right after disabling the firewall, no idea why when in the past it worked right without disabling it

I'm pretty sure that the default behavior these days is to prevent 'ping' from replying, for security reasons. Security through obfuscation...

Marking as [Resolved].