Wired Network Settings lost on reboot

[mainak_sen]

I have installed Lucid in a new laptop. Things are running OK except for the following problem:

I connect to the network/Internet using Wired ethernet (TCP/IP) with static IP. Everytime I reboot/restart my network configurations are lost and I have to re-configure. I have googled this problem and have seen a few posts/bugs in launchpad etc. for what appears to be the same issue...but unfortunately I am not getting a clear solution to this problem.

Just for clarity, I am using the following commands to re-configure my network everytime:

sudo ifconfig eth0 192.168.1.231 netmask 255.255.255.0 up
sudo route add default gw 192.168.1.254

Also note that I have already tried editing the /etc/network/interfaces and the /etc/resolv.conf files. But it seems that these are not being picked or are being overridden.

I shall appreciate any help.
Thanks in advance.

[dineshs]

please try this
First backup your /etc/network/interfaces

sudo cp /etc/network/interfaces /etc/network/interfaces.bak

gksudo gedit /etc/network/interfaces

Edit the file so that it contains only these two lines

auto lo
iface lo inet loopback

save the file and close
Right-click on the NM icon(two opposite arrows on top right) and then click on Edit Connections.
Select the tab, wired
select the ethernet connection you want and click edit(you can add the ethernet connection if not listed)
select ipv4
method-manual
click add
address 192.168.1.231
mask 255.255.255.0
gateway 192.168.1.254
then hit enter
DNS 4.2.2.1
(You can any working DNS)
then click apply

[Iowan]

I've seen results both ways on /etc/netowrk/interfaces - sometimes it solves the problem, sometimes NM seems to overwrite it. dineshs has more detailed instructions - you should be able to use Network Manager to configure a static address. Sometimes it's a bit tricky to get information to "stick" - apparently you need to hit [ENTER] after entering data (as mentioned - gateway in particular). Just clicking on the next field looks like it took, but data doesn't get saved.