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My host is MacOS X and my VM is Windows 7. So far, I only used NAT, but I want to be able to communicate from guest to host and vice versa. Inmy understanding, I need to add a second network adapter of type host-only, similar to this (viewtopic.php?f=8&t=34396) article.

I did this and its available in MacOS (ifconfig):

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vboxnet0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
	ether 0a:00:27:00:00:00 
	inet 192.168.56.1 netmask 0xffffff00 broadcast 192.168.56.255

Also, I can see both network adapters in Windows 7 (ipconfig):

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Ethernet adapter Local Area Connection 2:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Desktop Adapter #2
   Physical Address. . . . . . . . . : 08-00-27-2F-93-A2
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 192.168.56.2(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . :
   NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter Local Area Connection:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Desktop Adapter
   Physical Address. . . . . . . . . : 08-00-27-40-CB-CC
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::3d8a:ac1e:d6b5:401d%10(Preferred)
   IPv4 Address. . . . . . . . . . . : 10.0.2.15(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : Wednesday, October 16, 2013 5:32:45 PM
   Lease Expires . . . . . . . . . . : Thursday, October 17, 2013 5:32:46 PM
   Default Gateway . . . . . . . . . : 10.0.2.2
   DHCP Server . . . . . . . . . . . : 10.0.2.2
   DHCPv6 IAID . . . . . . . . . . . : 235405351
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-19-3D-55-AA-08-00-27-40-CB-CC

   DNS Servers . . . . . . . . . . . : 192.168.1.1
   NetBIOS over Tcpip. . . . . . . . : Enabled

Basically, as far as I understand, I created a network with IPs ranging from 192.168.56.1 to 192.168.56.254, where 192.168.56.1 is our MacOS host and 192.168.56.2 is our Windows VM. From the VM, I can ping both IP adresses sucessfully. However, from the host I can only ping 192.168.56.1 (the host itself); pinging 192.168.56.2 results in timeouts. I disabled the Windows firewall, but it still doesn't accept pings. FWIW, the network sharing center shows 2 networks, first one for the NAT and the second one for the host-only network, but it is labeled as "Unidentified network" and of type "Public network" - not sure if this might be an issue.

Has anyone an idea of what part of the configuration is wrong here?

If all network traffic works except from host to VM, it would be a firewall issue, or some other software blocking the traffic, or a missconfigured network in either the host or the guest.

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Adding host-only network in addition to NAT

Adding host-only network in addition to NAT

Re: Adding host-only network in addition to NAT