DNS changes with DHCP

I am using Ubuntu 6.06, and i have a problem configuring my network
connection. I use an ADSL router and an ethernet card to connect to the
net. I use DHCP to obtain an IP address, but after sometime the DNS
address changes on its own to 192.168.1.1, which obviously is not the
DNS that i give. I would like to know what tweaks are required to stop
the DHCP from changing my DNS address.

TIA

--Nadir

(E-Mail Removed) wrote:
> I am using Ubuntu 6.06, and i have a problem configuring my network
> connection. I use an ADSL router and an ethernet card to connect to the
> net. I use DHCP to obtain an IP address, but after sometime the DNS
> address changes on its own to 192.168.1.1, which obviously is not the
> DNS that i give. I would like to know what tweaks are required to stop
> the DHCP from changing my DNS address.
>
> TIA
>
> --Nadir
>

The "tweaks" are probably described in the man page of your dhcp
client. I don't know what Ubuntu uses by default - you may try:

man pump
man dhclient

Mihai

> The "tweaks" are probably described in the man page of your dhcp
> client. I don't know what Ubuntu uses by default - you may try:
>
> man pump
> man dhclient
>
> Mihai

Ubuntu uses dhclient, if i make /etc/resolv.conf as read only, then
probably the dns won't get changed. I couldn't find anything helpful in
the man pages btw.

(E-Mail Removed) wrote:
> > The "tweaks" are probably described in the man page of your dhcp
> > client. I don't know what Ubuntu uses by default - you may try:
> >
> > man pump
> > man dhclient
> >
> > Mihai
>
> Ubuntu uses dhclient, if i make /etc/resolv.conf as read only, then
> probably the dns won't get changed. I couldn't find anything helpful in
> the man pages btw.

well making resolv.conf read-only didn't work, instead i figured out a
proper solution:
in /etc/dhcp3/dhclient.conf i had to replace the prepend
domain-name-servers 127.1.0.0 (or whatever it is) with my own dns
address and uncomment it. Then i had to save my dns address in
/etc/resolv.conf, and reboot the system! Thats it!

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(E-Mail Removed) wrote:
>> The "tweaks" are probably described in the man page of your dhcp
>> client. I don't know what Ubuntu uses by default - you may try:
>>
>> man pump
>> man dhclient
>>
>> Mihai
>
> Ubuntu uses dhclient, if i make /etc/resolv.conf as read only, then
> probably the dns won't get changed. I couldn't find anything helpful in
> the man pages btw.

But there is more than one program that goes by that name.

In my debian install, I use

prepend domain-name-servers xxx.xxx.xxx.xxx

in /etc/dhcp3/dhclient.conf


see man dhclient.conf

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On 6 Dec 2006 00:38:20 -0800, I waved a wand and this message magically
appears in front of (E-Mail Removed):

> > Ubuntu uses dhclient, if i make /etc/resolv.conf as read only, then
> > probably the dns won't get changed. I couldn't find anything
> > helpful in the man pages btw.
>
> well making resolv.conf read-only didn't work, instead i figured out a
> proper solution:
> in /etc/dhcp3/dhclient.conf i had to replace the prepend
> domain-name-servers 127.1.0.0 (or whatever it is) with my own dns
> address and uncomment it. Then i had to save my dns address in
> /etc/resolv.conf, and reboot the system! Thats it!

Use dhcpcd instead. It has lots of options to control how you set these
vital IP settings.
--
http://www.munted.org.uk

You've been eating the cat food again, haven't you?