[TriLUG] override dhcp's dns

[Aaron S. Joyner]

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