network interfaces configuration

**tyho** · 10-23-2010

I have a weird problem with my /etc/network/interfaces configuration. I have the most simple static setup possible:

Code:

# cat /etc/network/interfaces
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
      address 192.168.1.1
      broadcast 192.168.1.255
      netmask 255.255.255.0
      network 192.168.1.0
      gateway 192.168.1.1

Still, it seems like it's not working:

Code:

# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:26:18:00:27:91  
          inet6 addr: fe80::226:18ff:fe00:2791/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1878 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4609 errors:0 dropped:0 overruns:0 carrier:13
          collisions:0 txqueuelen:1000 
          RX bytes:277567 (277.5 KB)  TX bytes:1499447 (1.4 MB)
          Interrupt:45 

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:10859 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10859 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:687746 (687.7 KB)  TX bytes:687746 (687.7 KB)

ppp0      Link encap:Point-to-Point Protocol  
          inet addr:10.140.222.168  P-t-P:10.64.64.64  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:6472 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6730 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3 
          RX bytes:3186416 (3.1 MB)  TX bytes:1208047 (1.2 MB)

The weirdest thing is doing

Code:

# ifconfig eth0 192.168.1.1 up

setups up the interface correctly:

Code:

# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:26:18:00:27:91  
          inet addr:192.168.1.1  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::226:18ff:fe00:2791/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1888 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4620 errors:0 dropped:0 overruns:0 carrier:14
          collisions:0 txqueuelen:1000 
          RX bytes:278384 (278.3 KB)  TX bytes:1501512 (1.5 MB)
          Interrupt:45 

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:10859 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10859 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:687746 (687.7 KB)  TX bytes:687746 (687.7 KB)

ppp0      Link encap:Point-to-Point Protocol  
          inet addr:10.140.222.168  P-t-P:10.64.64.64  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:6508 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6772 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3 
          RX bytes:3198722 (3.1 MB)  TX bytes:1213042 (1.2 MB)

??? There is no difference between the configuration in the network-file and the command-line setup, still only the latter works?

btw, since we are talking about network interfaces already:
It seems like Ubuntu doesn't use /etc/network/interfaces, or at least the Network Manager doesn't. No matter what I do, nothing changes in the file, unless I do it by myself. Where does Ubuntu save the network configuration?

**coopstah13** · 10-23-2010

network manager doesn't use that file

if you want to use it you should disable network manager, then you will have to use init.d scripts to start/stop networking

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