authorized mac ONLY dhcp

[Zhaohui Wang]

Thank you Simon,
My point is, only known client will get a lease,
static or dynamic really doesn't matter.

Because there is another DHCP server in the subnet, I don't want make
conflicts with it.
The output when I type service dhcpd start is just failed.

For your sample configuration, will it assign all arriving DHCP request to
192.168.0.100-199 address pool?
Or it will only answer MAC address 00:1e:0f:fa:75:2e and aa:bb:cc:dd:ee:ff
request? That's my question.

Should I put host mx{} and host dynamic{} inside the subnet delaration?

Many thanks




Best Regards
Zhao Wang


-----Original Message-----
From: dhcp-users-bounce at isc.org [mailto:dhcp-users-bounce at isc.org] On Behalf
Of Simon Hobson
Sent: Monday, November 10, 2008 3:14 AM
To: dhcp-users at isc.org
Subject: Re: authorized mac ONLY dhcp

Zhaohui Wang wrote:

>I am using isc dhcpd version3. Can anyone present a conf file 
>example showing that how to config dhcpd for autherized mac address 
>only?

'man dhcpd.conf'

>I need all other unknow MACs dhcp request ignored.
>Here is my draft dhcpd.conf file, but can not get dhcpd started. Any 
>correction or guide would be greatly appreciated.
>
>
>============================================
>ddns-update-style interim;
>ignore client-updates;
>range dynamic-bootp 192.168.0.128 192.168.0.254;
>default-lease-time 21600;
>
>
>host mx {
>                 hardware ethernet 00:1e:0f:fa:75:2e;
>                 fixed-address 192.168.0.7;
>                 option routers                  192.168.0.1;
>                 option subnet-mask              255.255.255.0;
>                 option broadcast-address        192.168.0.255;
>#               option nis-domain               "domain.org";
>#               option domain-name              "domain.org";
>         }
>==============================================

And what does it say when you try to start it - something about "No 
subnet declaration for w.x.y.z" perhaps ? That should have given you 
a clue.

Now, do you mean that you only want known clients to get a lease, but 
they can be dynamic address, or that they should all have fixed 
addresses, or a combination ?

Try this as an outline :

option domain-name-server a.b.c.d ;
<other global options here>

subnet 192.168.0.0 subnet-mask 255.255.255.0 {
   option routers                  192.168.0.1;
   option subnet-mask              255.255.255.0;
   option broadcast-address        192.168.0.255;
   <other subnet specific options here>
   pool {
     allow known clients ;
     range 192.168.0.100 192.168.0.199 ;
   }
}

host mx {
   hardware ethernet 00:1e:0f:fa:75:2e;
   fixed-address 192.168.0.7;
}
host dynamic1 {
   hardware ethernet aa:bb:cc:dd:ee:ff ;
}


If you don't want any dynamically addressed clients then simply omit 
the whole pool declaration. But you must have the subnet 
declaration(s) that matches the subnet on the interface(s) you are 
serving - even if it has nothing in it but the subnet specific 
options.

-- 
Simon Hobson

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