Hi all I am Using Ubuntu 8.10 & 9.04 & am joining a windows domain network .. everytime I change the nameserver of the resolv.conf .. it changes again automatically after I reconnect to network .. I am installing the Samba package of the Ubuntu .. is that the reason or anything else .. Thanks.

Hi,

Add your settings to /etc/dhcp3/dhclient.conf

If you are using DHCP, you can configure your system to use fixed addresses for DNS*---or to get the addresses using DHCP. If is somewhere in the network configuration menus/utilities.

*Domain Name Service----the DNS servers are what is listed in resolv.conf

I have just resolved a similar problem after installing fc10.

It seems that the Network Manager causes resolv.conf to be clobbered when no DHCP is available. NM is supposed to update resolv.conf if the ifcfg-eth0 contains directive PEERDNS=yes. When DHCP tells it what servers to use, it uses those. If DHCP is unavailable NM reads ifcfg-eth0 for DNS directives and uses those instead. If no DHCP and no DNS directives are available then the update of resolv.conf should not take place - but it does, placing null values for DNS into resolv.conf.

I fixed this by writing DNS directives into ifcfg-eth0. I suppose equally one could block all NM activity with NM_CONTROLLED=no, or you could block updating resolv.conf with PEERDNS=no. I did it my way so that I could easily use DHCP when it becomes available.

On FC10 if, you have not set up any named network configuration profiles, the files read by NM are in /etc/sysconfig/networking/profiles/default/