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Newb question. My setup: Win 7 Pro host laptop. Lab scenario: VM guests Server 2008 Ent (32 bit), 192.168.100.20, 192.168.100.10, 255.255.255.0, G/W 192.168.100.1, ip static, DNS not set, internal networking only, no DHCP.

Tried pings host-to-host w/ time outs. Reinstalled whole setup, identical responses. Loopback ping works.

Post the results of ipconfig /all from both guests.
When you say "Tried pings host-to-host w/ time outs" do you really mean guest to guest?

woops, it was guest-to-guest, Results of ipconfig /all to follow.

First guest machine:

Windows IP Configuration

Host Name . . . . . . . . . . . . : server2008-2
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Desktop Adapter
Physical Address. . . . . . . . . : 08-00-27-C9-32-AD
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::49bf:d1d2:6342:d893%10(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.100.20(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.100.1
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter Local Area Connection* 8:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
###########################################

2d guest box:

Windows IP Configuration

Host Name . . . . . . . . . . . . : Server2008-01
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Desktop Adapter
Physical Address. . . . . . . . . : 08-00-27-FF-BA-18
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80:6fed:dae4:d5b7%10(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.100.10(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.100.1
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter Local Area Connection* 8:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes


Suggestions??

Make sure that the name you setup for the internal adapter is the same in both guests (setting area - network). Example: intnet1 should be in both.

You can also run in the host command window VBoxManage showvminfo <VM Name> --details and post here. Replace <VM Name> with the actual name of the VM. Use "" if the name has a space in it.

You should browse Chapter 6. Virtual networking in your VirtualBox users manual.