NAT was working, now it doesn't

[Raht]

I used a network setup with two virtual interfaces, connected to 1) NAT for internet access and 2) Host-only network for connecting to server launched on VM. It worked for some time, but suddenly refused to and I am unable to solve this problem, since I'm not an expert when it comes to networking. Guest system is Ubuntu Server 10.04 LTS installed with JeOS configuration.

The VM is unable to connect with DNS, pinging IP address also fails. Here's info:

VBoxManage list -l runningvms

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Oracle VM VirtualBox Command Line Management Interface Version 3.2.6
(C) 2005-2010 Oracle Corporation
All rights reserved.

Name:            Development
Guest OS:        Ubuntu
UUID:            ec9493c3-c55e-4772-8ca9-7008297aa2d3
Config file:     S:\share\virtual\machines\Development\Development.xml
Hardware UUID:   ec9493c3-c55e-4772-8ca9-7008297aa2d3
Memory size:     256MB
Page Fusion:     off
VRAM size:       8MB
HPET:            off
Number of CPUs:  1
Synthetic Cpu:   off
CPUID overrides: None
Boot menu mode:  message and menu
Boot Device (1): Floppy
Boot Device (2): DVD
Boot Device (3): HardDisk
Boot Device (4): Not Assigned
ACPI:            on
IOAPIC:          on
PAE:             on
Time offset:     0 ms
RTC:             local time
Hardw. virt.ext: on
Hardw. virt.ext exclusive: off
Nested Paging:   on
Large Pages:     off
VT-x VPID:       off
State:           running (since 2010-07-17T09:32:45.647000000)
Monitor count:   1
3D Acceleration: off
2D Video Acceleration: off
Teleporter Enabled: off
Teleporter Port: 0
Teleporter Address:
Teleporter Password:
Storage Controller Name (0):            IDE Controller
Storage Controller Type (0):            PIIX4
Storage Controller Instance Number (0): 0
Storage Controller Max Port Count (0):  2
Storage Controller Port Count (0):      2
Storage Controller Name (1):            Floppy Controller
Storage Controller Type (1):            I82078
Storage Controller Instance Number (1): 0
Storage Controller Max Port Count (1):  1
Storage Controller Port Count (1):      1
IDE Controller (0, 0): S:\share\virtual\disks\Build Environment.vdi (UUID: 4f818
2d0-59a8-4695-8515-fdd1f27b428a)
IDE Controller (1, 0): C:\PROGRA~1\Oracle\VIRTUA~1\VBoxGuestAdditions.iso (UUID:
 4750c76e-4996-4207-a54f-365c2d1541db)
Floppy Controller (0, 0): Empty
NIC 1:           MAC: 080027C2A284, Attachment: NAT, Cable connected: on, Trace:
 off (file: none), Type: 82540EM, Reported speed: 0 Mbps, Boot priority: 0
NIC 1 Settings:  MTU: 0, Socket( send: 64, receive: 64), TCP Window( send:64, re
ceive: 64)
NIC 2:           MAC: 08002760C3F3, Attachment: Host-only Interface 'VirtualBox
Host-Only Ethernet Adapter', Cable connected: on, Trace: off (file: none), Type:
 Am79C973, Reported speed: 0 Mbps, Boot priority: 0
NIC 3:           disabled
NIC 4:           disabled
NIC 5:           disabled
NIC 6:           disabled
NIC 7:           disabled
NIC 8:           disabled
Pointing Device: PS/2 Mouse
Keyboard Device: PS/2 Keyboard
UART 1:          disabled
UART 2:          disabled
Audio:           disabled
Clipboard Mode:  HostToGuest
VRDP:            disabled
USB:             enabled

USB Device Filters: <none>

Shared folders:  <none>

Guest:

Configured memory balloon size:      0 MB

VBoxManage list -l dhcpservers

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Oracle VM VirtualBox Command Line Management Interface Version 3.2.6
(C) 2005-2010 Oracle Corporation
All rights reserved.

NetworkName:    HostInterfaceNetworking-VirtualBox Host-Only Ethernet Adapter
IP:             192.168.56.100
NetworkMask:    255.255.255.0
lowerIPAddress: 192.168.56.101
upperIPAddress: 192.168.56.254
Enabled:        Yes

ifconfig -a (on guest vm)

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eth0      Link encap:Ethernet  HWaddr 08:00:27:c2:a2:84  
          inet addr:10.0.2.15  Bcast:10.0.2.255  Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:fec2:a284/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1180 (1.1 KB)  TX bytes:1152 (1.1 KB)

eth1      Link encap:Ethernet  HWaddr 08:00:27:60:c3:f3  
          inet addr:192.168.0.101  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fec0::1d:a00:27ff:fe60:c3f3/64 Scope:Site
          inet6 addr: 2002:59a1:13e2:1d:a00:27ff:fe60:c3f3/64 Scope:Global
          inet6 addr: fe80::a00:27ff:fe60:c3f3/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:357 errors:0 dropped:0 overruns:0 frame:0
          TX packets:414 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:52432 (52.4 KB)  TX bytes:220392 (220.3 KB)
          Interrupt:16 Base address:0xd040 

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:190 errors:0 dropped:0 overruns:0 frame:0
          TX packets:190 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:41521 (41.5 KB)  TX bytes:41521 (41.5 KB)

[Sasquatch]

The Host still has internet? What happens if you refresh the Guest's IP address? If that fails, 'power cycle' the VM, so shut it down, then boot it up again. Check the Guest DNS configuration too, and compare it with the Host.