My isp is providing me the ip using DHCP. everything fine. But they are
sending 3 nameserver. And first DNS server is not responding. SO it take
time to switch to the secound dns. So, it's making problem (slow down).
I want to keep fix (will not updated or replace by dhcp) the
/etc/resolv.conf with only 2 nameserver (that are working).
Any idea, how to do this ?

--
S. M. Ibrahim (Lavlu)
Home page: http://lavluda.tripod.com
Blog: http://lavluda.tk
Yahoo!! ID: lavluda MSN ID: lavluda Skype : lavluda

On Thu, 29 Mar 2007 20:54:34 +0600
"S. M. Ibrahim (Lavlu)" <smibrahim@gmail.com> wrote:

> My isp is providing me the ip using DHCP. everything fine. But they are
> sending 3 nameserver. And first DNS server is not responding. SO it take
> time to switch to the secound dns. So, it's making problem (slow down).
> I want to keep fix (will not updated or replace by dhcp) the
> /etc/resolv.conf with only 2 nameserver (that are working).
> Any idea, how to do this ?

>From 'man dhclient':

> The supersede statement
>
> supersede [ option declaration ] ;
>
> If for some option the client should always use a locally-configured
> value or values rather than whatever is supplied by the server, these
> values can be defined in the supersede statement.

So if you're using dhclient you could try something like:

supersede domain-name-servers a.b.c d.e.f

Also from the manpage:

> The request statement
>
> request [ option ] [, ... option ];
>
> The request statement causes the client to request that any server
> responding to the client send the client its values for the specified
> options. Only the option names should be specified in the request
> statement - not option parameters. By default, the DHCP server
> requests the subnet-mask, broadcast-address, time-offset, routers,
> domain-name, domain-name-servers and host-name options.

So you could write a request line and omit 'domain-name-servers'.

I have not tried any of this.

HTH,
Celejar


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Celejar wrote:
> On Thu, 29 Mar 2007 20:54:34 +0600
> "S. M. Ibrahim (Lavlu)" <smibrahim@gmail.com> wrote:
>
>> My isp is providing me the ip using DHCP. everything fine. But they are
>> sending 3 nameserver. And first DNS server is not responding. SO it take
>> time to switch to the secound dns. So, it's making problem (slow down).
>> I want to keep fix (will not updated or replace by dhcp) the
>> /etc/resolv.conf with only 2 nameserver (that are working).
>> Any idea, how to do this ?
>
>>From 'man dhclient':
>
>> The supersede statement
>>
>> supersede [ option declaration ] ;
>>
>> If for some option the client should always use a locally-configured
>> value or values rather than whatever is supplied by the server, these
>> values can be defined in the supersede statement.
>
> So if you're using dhclient you could try something like:
>
> supersede domain-name-servers a.b.c d.e.f
>
> Also from the manpage:
>
>> The request statement
>>
>> request [ option ] [, ... option ];
>>
>> The request statement causes the client to request that any server
>> responding to the client send the client its values for the specified
>> options. Only the option names should be specified in the request
>> statement - not option parameters. By default, the DHCP server
>> requests the subnet-mask, broadcast-address, time-offset, routers,
>> domain-name, domain-name-servers and host-name options.
>
> So you could write a request line and omit 'domain-name-servers'.
>
> I have not tried any of this.
>
> HTH,
> Celejar
>
>
I had a similar problem. The file /etc/dhcp3/dhclient.conf is the file
that controls resolv.conf (at least on this system). You can specify
which DNS is used first by using

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

replacing of course the x's with the ip address of the DNS. This line
is already present using 127.0.0.1 but is commented out.

I have tried it, and it works.

Joe
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>
> I had a similar problem. The file /etc/dhcp3/dhclient.conf is the file
> that controls resolv.conf (at least on this system). You can specify
> which DNS is used first by using
>
> prepend domain-name-servers xxx.xxx.xxx.xxx;
>
> replacing of course the x's with the ip address of the DNS. This line
> is already present using 127.0.0.1 but is commented out.
>
> I have tried it, and it works.


Yea, it's working, thanks.


Joe
> - --
> Registerd Linux user #443289 at http://counter.li.org/
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>
> iD8DBQFGC+tsiXBCVWpc5J4RArQdAKDO10MEfaW4p/3oBrJbWO3NplhEtQCghLNz
> GZiR4zMqeuWw4Qy33w6LmjY=
> =3+HX
> -----END PGP SIGNATURE-----
>
>
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>


--
S. M. Ibrahim (Lavlu)
Web Application Developer
somewherein...
Home page: http://lavluda.tripod.com
Blog: http://lavluda.tk
Yahoo!! ID: lavluda MSN ID: lavluda Skype : lavluda