No network connection after boot

[stava]

I recently installed Ubuntu Server 10.10. Establishing a network connection during the installation process was problematic, it took me a few attempts to get it working (not that I actually did anything other than retrying). However, now when I boot the server it does not have a network connection. ifconfig says that eth0 is configured, but it doesn't get an IP. So I have to do

sudo ifdown eth0
sudo ifup eth0 192.168.1.103

And it would work. But the same problem will occur when I reboot.

Yes, the router is configured to give this server a static IP. But I've changed /etc/network/interfaces to reflect this. This is my /etc/network/interfaces file:

# 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
auto eth0
iface eth0 inet static
address 192.168.1.103
netmask 255.255.255.0
gateway 192.168.1.1

ifconfig output (after doing ifdown/ifup):

eth0      Link encap:Ethernet  HWaddr 00:24:8c:26:e2:74  
          inet addr:192.168.1.103  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::224:8cff:fe26:e274/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:322 errors:0 dropped:0 overruns:0 frame:0
          TX packets:213 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:30644 (30.6 KB)  TX bytes:85687 (85.6 KB)
          Interrupt:28 

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:7 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:612 (612.0 B)  TX bytes:612 (612.0 B)

[stava]

I tried adding broadcast 192.168.1.255 in the interfaces file, still have the same problem

[karthick87]

Can you post your ouput of resolv.conf file

cat /etc/resolv.conf

[stava]

cat /etc/resolv.conf
nameserver 192.168.1.1

[stava]

I dont know if this is useful:

dmesg | grep eth0
[    1.404535] eth0: RTL8168c/8111c at 0xffffc90000340000, 00:24:8c:26:e2:74, XID 1c4000c0 IRQ 28
[    4.187061] r8169: eth0: link down
[    4.187068] r8169: eth0: link down
[    4.187335] ADDRCONF(NETDEV_UP): eth0: link is not ready
[   37.175121] r8169: eth0: link down
[   37.175357] ADDRCONF(NETDEV_UP): eth0: link is not ready
[   40.608402] r8169: eth0: link up
[   40.608701] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[   50.840029] eth0: no IPv6 routers present

[karthick87]

You should give your DNS server address in resolv.conf file..For your reference see my resolv.conf file

karthick@Ubuntu-desktop:~$ cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 218.248.255.139
nameserver 218.248.255.146

DNS server address will be different for you.So ask your ISP to know DNS address.

[stava]

You should give your DNS server address in resolv.conf file..For your reference see my resolv.conf file

karthick@Ubuntu-desktop:~$ cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 218.248.255.139
nameserver 218.248.255.146

DNS server address will be different for you.So ask your ISP to know DNS address.

I dont really see what DNS has to do with this. The router (192.168.1.1) will redirect DNS queries to my ISPs nameservers (or nameservers defined by me).

My desktop computer have the exact same resolv.conf file as this server, and it works.

The problem is that the server dont seem to connect to the network until I do ifdown/ifup manually.

[stava]

Well I tried changing nameservers anyway, it didn't work.

[stava]

I just noticed that with the configuration I have in /etc/network/interfaces (see above) I don't need to do

ifdown eth0
ifup eth0 192.168.1.103

It's enough to just do

ifdown eth0
ifup eth0

So I suspect its not my configuration that is the problem (most of it is default from the installation anyway).

Perhaps a temporary solution would be to run a script each time the system boots which would automate this? However thats done?

Still have the original problem.

[stava]

bump