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Hi, I want to connect a guest OS to a guest OS. All 3 OS are using static IP address. And the guest OS are using NAT adapters. Below is ipconfig of the 3 OS's.


host OS: Windows 7 ultimate
guest os 1: Windows 2008 r2 sp1
guest os 2: wiondows 7 professional

Host: ipconfig /all
Wireless LAN adapter Wireless Network Connection 2:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : NETGEAR WG111v3 Wireless-G USB Adapter #2

Physical Address. . . . . . . . . : C0-3F-0E-3F-22-99
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::fdcdc954:d427%13(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.30(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 532692750
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-13-E1-65-3D-00-26-2D-3B-68-E9

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

Ethernet adapter VirtualBox Host-Only Network:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : VirtualBox Host-Only Ethernet Adapter
Physical Address. . . . . . . . . : 08-00-27-00-40-74
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::f564:eb01:f343:a0e0%23(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.56.1(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 705167399
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-13-E1-65-3D-00-26-2D-3B-68-E9

DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled

GUEST 1 ipconfig /all
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Desktop Adapter
Physical Address. . . . . . . . . : 08-00-27-65-E3-DA
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::cc34:b853:d276:cac0%11(Preferred)
IPv4 Address. . . . . . . . . . . : 10.0.2.15(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 10.0.2.2
DHCPv6 IAID . . . . . . . . . . . : 235405351
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-15-45-F3-79-08-00-27-65-E3-DA

DNS Servers . . . . . . . . . . . : ::1
192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled




GUEST 2 ipconfig/all
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Desktop Adapter
Physical Address. . . . . . . . . : 08-00-27-22-DD-6D
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::f50a:79c17e4c%11(Preferred)
IPv4 Address. . . . . . . . . . . : 10.0.2.16(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 10.0.2.2
DHCPv6 IAID . . . . . . . . . . . : 235405351
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-14-0F-00-36-08-00-27-F6-96-2E

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

Using NAT will be a problem. Switch to either Bridge or use Internal if the guests don't need to see the host.
See Chapter 6 of your VirtualBox users guide