On Wed, Feb 6, 2008 at 14:40:33 +0000 (+0000), Andy Smith wrote:
> Hi Hugo,
>
> On Wed, Feb 06, 2008 at 02:28:41PM +0000, Hugo Mills wrote:
> > Thus, the main question is: Can I tell my laptop to use one DNS
> > server for a specific subdomain, but use the DNS server provided by
> > DHCP for all other domains?
>
> I believe you can *almost* do this by use of forward zones, but for
> anything but the forward zones the queries would then go out to the
> DNS roots as usual.
Or setup forwarders for those:
options {
forwarders {
1.2.3.4;
5.6.7.8;
};
// ask nameservers first, only ask root nameservers
// if forward nameservers do not respond
forward first;
};
This all involves running a DNS server on your laptop, and configuring
DHCP client to populate the named.conf file appropriately.
> zone "carfax.org.uk" {
> type forward;
> forwarders {
> 10.2.0.18;
> };
> };
Personally I just have my VPN tell the VPN client the DNS details,
this then uses resolvconf to setup /etc/resolv.conf:
http://www.smop.co.uk/mediawiki/index.php/OpenVPN
With the VPN as the preferred resolvconf device, this means that my
/etc/resolv.conf is either:
non-VPN:
nameserver 1.2.3.4
search example.org
VPN:
nameserver 192.168.100.3
nameserver 1.2.3.4
search smop.co.uk example.org
The only issue here is that if I then lookup foo.example.org my
nameserver might say "nope, doesn't exist". Whereas the 1.2.3.4
nameserver might know about it. This happens if foo.example.org is an
internal only name. You _might_ be able to get your nameserver to
say "I'm not authorative for example.org" if that's a big problem, but
I've not looked into it.
Adrian
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