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Need some advice please.

I'm using a Mac Host, OS 10.7.3, and VirturalBox 4.1.12. The Guests are two Windows 7 OS. The network configurations are:

1st Windows 7 Guest1:
Adapter 1: NAT
Adapter 2: Internal Network - "myint"

2nd Windows 7 Guest2:
Adapter 1: Internal Network - "myint"

I also set up the DHCP server by using the following command:

VBoxManage dhcpserver add --netname myint --ip 10.0.7.100 --netmask 255.255.255.0 --lowerip 10.0.7.101 --upperip 10.0.7.254 --enable

Using the command "ipconfig" in each Windows 7 guest shows that the network is configured correctly. However, when I perform a "ping" to see if they can communicate with each other, I just get a "Request timed out." response. Here are the ipconfig outputs for each guest:

Windows 7 Guest1:
Windows IP Configuration
Ethernet adapter Local Area Connection 2:

Connection-specific DNS Suffix . :
Link-local IPv6 Address . . . . . : fe80::7024:ff569738%14
IPv4 Address. . . . . . . . . . . : 10.0.7.103
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . : "My ISP Address"
Link-local IPv6 Address . . . . . : fe80:38bb:fe8e:546e%11
IPv4 Address. . . . . . . . . . . : 10.0.2.15
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 10.0.2.2

Tunnel adapter "From My ISP":

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : "My ISP Address"

Tunnel adapter Local Area Connection* 9:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

Tunnel adapter isatap.{8FC8F28F-0604-46DD-BAA9-9E0CD52B31D8}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :


Window 7 Guest2:
Windows IP Configuration
Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Link-local IPv6 Address . . . . . : fe80::a046:948d:ad93:a81e%11
IPv4 Address. . . . . . . . . . . : 10.0.7.102
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :

Tunnel adapter isatap.{ED0022F1-0813-4886-A771-93290C2CB15D}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

Tunnel adapter Local Area Connection* 9:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

Does anyone have any ideas why the guests are not able to communicate with each other. By the way, the Windows guest with the NAT adapter can successfully ping the OS X host.

Check the Windows firewall/s and make sure that icmp is enabled.

Check the Windows firewall/s and make sure that icmp is enabled.

Your suggestion worked. Thanks.

I used instructions from this site, http://www.sysprobs.com/enable-ping-reply-windows-7, to enable ICMP. It didn't work at first, but once I shutdown and restarted the VMs, both guests were able to communicate with each other.