i have installed virtualbox on centos , and installed xp as a guest os.
my LAN is on 10.200.2.x/24 network
inorder to avoid conflict i have given centos ip as 10.200.2.191/24 and a virtual ip 192.168.56.4/24
my gateway is 10.200.2.1
i am able to ping from my guest os to host os the ip address but not the gateway inorder for internet connectivity
please help me with this


some of the configuration of virtual box

Display
Video Memory:

16 MB
3D Acceleration:

Disabled
2D Video Acceleration:

Disabled
Remote Display Server:

Disabled

Storage
IDE Controller


IDE Primary Master:

ms.vdi (Normal, 5.56 GB)
IDE Secondary Master (CD/DVD):

Host Drive Optiarc DVD RW AD-7170S (scd0)
Floppy Controller


Floppy Device 0:

Empty

Audio
Disabled



Network
Adapter 1:

PCnet-PCI II (Host-only adapter, 'vboxnet0')

Hi,

What version of CentOS are your running?
What are the specifications of your machine?
Have you setup a network bridge for your virtual interface for your VM?

Can you also post the output of:

Is there a specific reason you're using VBox instead of Xen or KVM?

Cheers,
Yas

The symptoms are expected using PCnet-PCI II (Host-only adapter, 'vboxnet0'). NAT (the default?) or Bridged would allow the guest to reach the gateway.

In the case of Bridged, the guest would have to be configured with an IP address on the LAN and would be visible on the LAN.

the output of ifconfig -a

[root@demodb ~]# ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:30:05:E52:90
inet addr:10.200.2.191 Bcast:10.200.2.255 Mask:255.255.255.0
inet6 addr: fe80::230:5ff:fee5:d290/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1891815 errors:0 dropped:0 overruns:0 frame:0
TX packets:2723824 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:227996882 (217.4 MiB) TX bytes:3299965319 (3.0 GiB)
Interrupt:217 Base address:0xc000

eth0:1 Link encap:Ethernet HWaddr 00:30:05:E52:90
inet addr:192.168.56.4 Bcast:192.168.56.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:217 Base address:0xc000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:15126 errors:0 dropped:0 overruns:0 frame:0
TX packets:15126 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:75106122 (71.6 MiB) TX bytes:75106122 (71.6 MiB)

sit0 Link encap:IPv6-in-IPv4
NOARP MTU:1480 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

vboxnet0 Link encap:Ethernet HWaddr 0A:00:27:00:00:00
inet addr:192.168.56.1 Bcast:192.168.56.255 Mask:255.255.255.0
inet6 addr: fe80::800:27ff:fe00:0/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:293 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:55580 (54.2 KiB)


i have now changed the connection to bridge more but am not able to ping my host from the guest
please help me rectify this problem

Did you change the guest to a 10.200.2.x/24 IP address and netmask too?

no my guest has ip in the range 192.168.56.X , i can give ip in the range of 10.200.2.X coz there are limited ip in out company network , if i give any ip the it would conflict. so i thousht of giving ip in the range of 192 and then do some NAT or redirect