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I have a Ubuntu 13.10 installed as a guest on virtualbox 4.3.4 r91027 on a Windows 7 host.

When I use network mode NAT, the ubuntu guest can access the internet. but when I change the networking mode to bridged, the ubuntu guest does not connect to internet and does not get a inet address.

Here is the ifconfig output for NAT.
eth0      Link encap:Ethernet  HWaddr 08:00:27:0b:cc:7b  
          inet addr:10.0.2.15  Bcast:10.0.2.255  Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:fe0b:cc7b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:89652 errors:0 dropped:0 overruns:0 frame:0
          TX packets:42366 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:107627599 (107.6 MB)  TX bytes:3037228 (3.0 MB)

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:65536  Metric:1
          RX packets:1584 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1584 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:154254 (154.2 KB)  TX bytes:154254 (154.2 KB)


Here is the same output for Bridged network.
eth0      Link encap:Ethernet  HWaddr 08:00:27:0b:cc:7b  
          inet6 addr: fe80::a00:27ff:fe0b:cc7b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:89652 errors:0 dropped:0 overruns:0 frame:0
          TX packets:42383 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:107627599 (107.6 MB)  TX bytes:3040704 (3.0 MB)

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:65536  Metric:1
          RX packets:1584 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1584 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:154254 (154.2 KB)  TX bytes:154254 (154.2 KB)

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