Can BIND on vpn use name servers assigned via DHCP by ISP?

Barry Margolin barmar at
Thu Feb 8 00:47:02 UTC 2007

In article <eqcvf4$283h$1 at>,
 "Jorge Canas" <jcanas2000 at> wrote:

> Hi,
> I have setup a home gateway (2 ethernet cards, one on the WAN and the other 
> on my private network (vpn)).
> The WAN interface gets configured via DHCP from my ISP.  The ISP also 
> provides the addresses of its primary and backup nameservers. I believe 
> these get written into /etc/resolv.conf
> The VPN interface has a private static IP address, and a local DNS server 
> runs off this interface for the rest of the clients on the vpn.
> Anyway, so far, this a very vanilla setup.  But I am not sure how to make 
> the local DNS forward every query it receives to the nameservers that appear 
> in /etc/resolv.conf
> Anyone know how to configure the local DNS to do that?  Caching on the local 
> DNS would also be nice, but the forwarding bit is more important to me right 
> now.

named doesn't make use of resolv.conf, it uses the "forwarders" option 
in named.conf.

You could run a cron job every minute that checks whether resolv.conf 
has changed, and if so it copies the servers into the forwarders option 
of named.conf and runs "rndc reconfig".

Barry Margolin, barmar at
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
*** PLEASE don't copy me on replies, I'll read them in the group ***

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