[Dnsmasq-discuss] DHCP for pairs MAC:IP only

vip at iptrans.net vip at iptrans.net
Thu Jan 25 17:57:20 GMT 2018


2018-01-25 18:42, john doe написав:
> On 1/25/2018 4:55 PM, vip at iptrans.net wrote:
>> 
>> Good day
>> 
>> I have a DHCP-router based on dnsmasq with interface eth2 and networks 
>> 192.168.100.1/24 192.168.102.1/24 10.0.0.1/27 on this interface. There 
>> are computers-dhcp-clients on this network which have to get IP based 
>> on their MAC-addresses. And if file /etc/dnsmasq.conf doesn't contain 
>> line with corresponding MAC (option dhcp-host) then this computer 
>> doesn't get an IP via my DHCP-router.
>> 
>> But.
>> 
>> In /etc/dnsmasq.conf:
>> 
>> # Uncomment this to enable the integrated DHCP server, you need
>> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>> # to supply the range of addresses available for lease and optionally
>> # a lease time. If you have more than one network, you will need to
>> # repeat this for each network on which you want to supply DHCP
>> # service.
>> # dhcp-range=192.168.0.50,192.168.0.150,12h
>> 
>> And if I uncomment "# dhcp-range" then I'll have computer-dhcp-client 
>> which will get a ip address without corresponding MAC in 
>> /etc/dnsmasq.conf.
>> 
> 
> If I understand you correctly you want only hosts that have a matching
> mac address to be given an address for a specific subnet
> (192.168.100.0/24).
> For that you can use the 'static' keyword:
> 
> dhcp-range=192.168.100.2,static,12h
> 
> In case it is not what you want dhcp-host should have the form:
> 
> dhcp-range=192.168.100.2,192.168.100.253,12h
> dhcp-host=ab:cd:ef:gh:ij:kl,fix-ip-to-be-given-to-host

Thanks.

:) My man page for dnsmasq doesn't have a information about optional 
static mode for dhcp-range like on link 
http://www.thekelleys.org.uk/dnsmasq/docs/dnsmasq-man.html:

"The optional <mode> keyword may be static which tells dnsmasq to enable 
DHCP for the network specified, but not to dynamically allocate IP 
addresses: only hosts which have static addresses given via dhcp-host or 
from /etc/ethers will be served. A static-only subnet with address all 
zeros may be used as a "catch-all" address to enable replies to all 
Information-request packets on a subnet which is provided with stateless 
DHCPv6, ie --dhcp-range=::,static"

For example configuration:

interface=eth2
dhcp-range=192.168.100.0,static
dhcp-range=192.168.102.0,static
dhcp-range=10.0.0.0,static
dhcp-host=ab:cd:ef:gh:ij:kl,192.168.102.10

With this configuration pc with mac "ab:cd:ef:gh:ij:kl" get 
192.168.102.10 and no other ip.
Аnd any other pc with a different mac will not receive any ip from my 
dhcp-server.





More information about the Dnsmasq-discuss mailing list