DNS caching nameserver problem

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I have a DNS caching server that works ok until
it is rebooted. When this happens it restarts
normally, except the /etc/resolv.conf file is
altered and the server stops serving names. (The
line 'nameserver 127.0.0.1' is missing and other
namservers appear instead).

The server obtains an address through DHCP and my
theory is that the DHCP server is providing it
with DNS servers as well, which it substitutes
when it probably shouldn't.

I have tried a horrible patch in rc.local,
stopping named, overwriting resolv.conf with a
correct copy and restarting, but
editing the file and restarting 'named' does not
seem to work 100% of the time, requiring
sometimes one or two restarts of the service to
make it serve names for the internal hosts.

What do you think is the problem?
Is there a workaround?

Thank you for your comments.
Gerardo



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