[Dnsmasq-discuss] dnsmasq as local DNS cache - scenario: notebook with ppp/dhcp conigured links

[Simon Kelley]

Mateusz Korniak wrote:
> Hi !
> I am using dnsmasq as excellent dns speed up on my notebook.
> And it works great ! Big thanks to authors !
> 
> I have only problem with dynamically created links.
> 
> I made my dhcp client to overwrite /etc/resolv.conf every time link is 
> configured with preadding 127.0.0.1 as nameserver in front of list.
> That fixed dhcp links but that trick does not work with ppp created (gprs - 
> really slow ) links for me.
> As ppp stores it's dnses in /etc/ppp/resolv.conf when ppp link is created and 
> no additions of nameservers seems to be possible.
> 
> What is your sugestion for fixing that issue ?
> 
> I was thinking about feature allowing to define many 
> resolv-files
> and than:
> 1) use nameservers only from most recently updated file 

We got there first. Exactly this feature is already in dnsmasq.

> 2) use namservers summed from all resolv-files (and filtering nameservers 
> which are not accessible) ?

The best way to do this is to just put

nameserver 127.0.0.1

in /etc/resolv.conf; that should never change. Then make your
DHCP client write /etc/resolv.conf.dhcp or something similar. You
already found that pppd writes /etc/ppp/resolv.conf, so just put

resolv-file=/etc/resolv.conf.dhcp
resolv-file=/etc/ppp/resolv.conf

in /etc/dnsmasq.conf

Whichever file changed last will be used.


HTH

Simon.

> 
> 
> TIA for any comments, best regards,