From owner-freebsd-net  Sat May 30 23:04:53 1998
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Date: Sun, 31 May 1998 00:04:53 -0600 (MDT)
From: <listuser@seifried.org>
To: "Pitcairn, Duncan" <DuncanP@Cairnwood.com>
cc: "'dhcp-client@fugue.com'" <dhcp-client@fugue.com>,
        "'freebsd-net@freebsd.org'" <freebsd-net@FreeBSD.ORG>,
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Subject: Re: Move a value from dhcp client on interface to dhcp server on othe r interface
In-Reply-To: <DD95A52544D0D01198C300608CCC29B9322EE2@Southampton.Cairnwood.com>
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> Does anyone have a script or instructions for moving the value for
> domain-name-servers received by dhclient to a dhcpd.conf file? 
> 
> What I am working on is a FreeBSD 2.2.6 system with two network
> interfaces. Interface 1 is connected to a Cable Modem through which it
> receives dhcp client values, including doman-name-servers. Interface 2
> is conected to our network and it is running dhcpd. I need to move the
> domain-name-server values from dhclient.leases (or from resolve.conf)
> after dhclient runs but before dhcpd starts so that dhcpd can pass
> domain-name-servers on to the clients on our network.

In Linux it writes the DNS info to /etc/resolv.conf:

domain blah.com
nameserver 2.2.2.2
nameserver 2.3.3.2

etc...... I would imagine you could write a script that would start the
client dhcp up, attach to the cablemodem, get the info, you're now on the
network, then strip the needed info from resolv.conf (or bsd equiv) and
write it to the dhcpd.conf file. 

To bad you cannot specify the dhcp server to pass part of the dhcp
requests 'upstream'. ie:

subnet 10.0.0.0 netmask 255.255.0.0 {
        range 10.0.0.210 10.0.0.250;
	option domain-name-servers pass-dhcp-request-out-eth0
	option domain-name pass-dhcp-request-out-eth0
}

or something nifty like that. Anyone wanna write a new rfc? ;)

-seifried


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