[TriLUG] override dhcp's dns

[Myrhillion]

you could just make /etc/resolv.conf immutable after you've edited it, 
until you want to update it.
You just have to remember you did this...  

chattr +i /etc/resolv.conf
lsattr /etc/resolv.conf

Doug Taggart

Aaron S. Joyner wrote:

> Jon Carnes wrote:
>
>> On Sat, 2004-06-19 at 04:27, Michael Hrivnak wrote:
>>  
>>
>>> I followed the list advice and setup a simple cacheing dns server.  
>>> I works great for clinets, but not on the gateway itself (on which 
>>> named is running).  RR has its own ideas about what DNS servers it 
>>> should use.  How do I tell my machine to ignore what dhcp says about 
>>> DNS and use itself instead?
>>>
>>> Thanks a ton,
>>>
>>> Michael
>>>   
>>
>>
>> In /etc/resolv.conf put
>>  nameserver 127.0.0.1
>>
>> as the first entry.  That tells the machine to use itself first for DNS.
>>
>> HTH - Jon Carnes
>>
>>  
>>
> And to make it stick, you'll need to tell your DHCP client not to 
> update /etc/resolv.conf (as it likely will do, next time you acquire a 
> new lease).  This varies from distribution to distribution, but 
> generally if you're using the older versions of isc's dhcpcd (ala RH 
> 7.x) you need to pass it an argument of -R to tell it not to update 
> the /etc/resolv.conf.  If you're running something like dhclient 
> (RedHat 9, maybe newer), you'll need to create a 
> /etc/dhclient-enter-hooks with a replacement function for 
> make_resolve_conf(), something like this: function make_resolv_conf() 
> { echo; }  On a BSD box you're going to need to add an appropriate 
> parameter to /usr/local/etc/rc.conf to pass the right args to dhcpcd 
> or dhclient, depending on your version, etc.  :)
>
> More generally speaking, read the docs for your dhcp client.  :)
>
> Aaron S. Joyner