Dual DNS server farms in dhcpd.conf
Frank Bulk
frnkblk at iname.com
Wed Apr 29 02:44:53 UTC 2009
We have a GUI front-end to our DHCP configuration, and we like to keep our
host definitions organized as opposed to clumping them all in the global
scope. We've always placed our hosts in the shared-subnet without issues.
But the GUI shows what's inherited because it's location in the
configuration.
Regards,
Frank
-----Original Message-----
From: dhcp-users-bounces at lists.isc.org
[mailto:dhcp-users-bounces at lists.isc.org] On Behalf Of Simon Hobson
Sent: Tuesday, April 28, 2009 1:30 PM
To: Users of ISC DHCP
Subject: RE: Dual DNS server farms in dhcpd.conf
John Tabasz (jtabasz) wrote:
>So I understand properly, when you say putting
>the host statements inside a scope other than global isn't generally a
>good idea, you are referring to the shared network scope plus the second
>scope of the subnet, right?
Exactly. In your config, the host statements are inside the
shared-subnet - a case we haven't come across before so I'm not
entirely sure what happens here. A couple of times, user have put
host statements inside a subnet declaration (erroneously) thinking
that this would make the statement valid only within that subnet.
They've them come to the list wondering why a client gets an IP
address, but other options (such as routers !) from the wrong subnet
when the client is connected elsewhere.
What's happened in that case is that the client gets an IP according
to the subnet where it is connected, but inherits options from the
subnet where it's declared. Hence we keep advising to keep host
statement in the global scope.
I think in your case it **probably** isn't an issue since there are
no options declared at the shared-network level - but best to avoid
it anyway.
--
Simon Hobson
Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.
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