eth0 disappeared, no network connection

**bennyfofenny** · August 8th, 2010

After rebooting, I found that the server couldn't see the network. The machine has dual gigabit ethernet (eth0 and eth1). eth0 is connected to the internet, but disappeared. ifconfig used to show eth0, eth1, and lo, but now only shows eth1 and lo. If I boot into rescue mode I can get internet and ifconfig returns eth0 and lo. Any ideas on how to fix this?
I apologize in advance if I ask any noob questions. I'm not a very experienced Linux user.
Thanks!

**clrg** · August 8th, 2010

Show me

Code:

ifconfig -a

please

**bennyfofenny** · August 8th, 2010

Code:

eth1      Link encap:Ethernet  HWaddr 00:1f:bc:02:86:8f  
          inet6 addr: fe80::21f:bcff:fe02:868f/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:615 errors:0 dropped:0 overruns:0 frame:0
          TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:48807 (48.8 KB)  TX bytes:1494 (1.4 KB)
          Interrupt:32 Base address:0x4000 

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:266 errors:0 dropped:0 overruns:0 frame:0
          TX packets:266 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:19124 (19.1 KB)  TX bytes:19124 (19.1 KB)

Code:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet dhcp

Thanks for the quick reply!

**Iowan** · August 8th, 2010

Does sudo lshw -C network reveal anything about eth0?

**clrg** · August 8th, 2010

Show me

Code:

cat /etc/udev/rules.d/70-persistent-net.rules

**bennyfofenny** · August 8th, 2010

Code:

  *-network               
       description: Ethernet interface
       product: RTL8111/8168B PCI Express Gigabit Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:08:00.0
       logical name: eth1
       version: 03
       serial: 00:1f:bc:02:86:8f
       size: 10MB/s
       capacity: 1GB/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=off broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half latency=0 link=yes multicast=yes port=MII speed=10MB/s
       resources: irq:32 ioport:ae00(size=256) memory:f3eff000-f3efffff(prefetchable) memory:f3ef8000-f3efbfff(prefetchable) memory:f3ae0000-f3afffff(prefetchable)

Code:

# This file was automatically generated by the /lib/udev/write_net_rules
# program, run by the persistent-net-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single
# line, and change only the value of the NAME= key.

# PCI device 0x10ec:0x8168 (r8169)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:1f:bc:02:86:8f", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

# PCI device 0x10ec:0x8168 (r8169)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:1f:bc:02:86:8e", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

Here's the info!