[SOLVED]No internet?

[lugoteehalt]

Using Debian Lenny 5 32 bit guest on a Debian Lenny 5 64 bit host.

The guest used to get the internet, then had a bit of trouble with it and the internet has stopped. Internet all right on the host.

Don't know if following is relevant:

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ifconfig -a                                      
eth2      Link encap:Ethernet  HWaddr 08:00:27:e7:ce:98  
          BROADCAST MULTICAST  MTU:1500  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:1000                        
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)              
          Interrupt:10 Base address:0xd020                    

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:12 errors:0 dropped:0 overruns:0 frame:0
          TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0                            
          RX bytes:840 (840.0 B)  TX bytes:840 (840.0 B)

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dmesg|grep eth
[    4.615109] eth0: registered as PCnet/PCI II 79C970A
[    6.303986] Driver 'sd' needs updating - please use bus_type methods
[   11.167513] udev: renamed network interface eth0 to eth2

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ifup eth2
Ignoring unknown interface eth2=eth2.


ifup eth0
Internet Systems Consortium DHCP Client V3.1.1
Copyright 2004-2008 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

SIOCSIFADDR: No such device
eth0: ERROR while getting interface flags: No such device
eth0: ERROR while getting interface flags: No such device
Bind socket to interface: No such device
Failed to bring up eth0.

If eth0 is changed to eth2 in /etc/network/interfaces in the guest then eth2 does come up - presumably because udev has renamed eth0 to eth2 - but still cannot get the internet. Great thanks any help.

[Sasquatch]

Run 'dhclient' as root in the Guest and you should have internet again. The interface name change is because the MAC address changed. Linux creates a new interface name when it detects an interface with a different MAC address. You can change this by editing or removing /etc/udev/rules.d/70-persistent-net.rules and reboot.

[lugoteehalt]

Vast thanks Sasquatch, dhclient worked instantly. Never have worked that out myself in a million years.

[rambutan]

@Sasquatch

Big THX. Messed around forever until I found your post. dhclient did not work, but editing the persistent-net.rules file did the trick.