dhcp-match does a substring match, not a regexp or wildcard one: the *
character is not special. Your attempts are therefore looking for a
substring "android*" in the option and failing.

Remove the * and all will be well, I think.


Cheers,

Simon.

On 07/08/18 14:03, Hugo Segovia wrote:
> El Mon, 6 Aug 2018 20:39:53 +0100
> Simon Kelley <si...@thekelleys.org.uk> escribió:
>> Use dhcp-match to set a tag based on the existence of the "android"
>> substring in the hostname option, and then dhcp-ignore to ignore all
>> clients with that tag set.
>>
>>
>> Simples!
>>
>>
>> Simon.
>>
>>
>>
>> On 04/08/18 16:32, Hugo Segovia wrote:
>>> Hello! 
>>>
>>> First, for "client name" I mean the fourth field in an typical
>>> dnsmasq.lease line:
>>>                                                * this one! *
>>> 1532225279 aa:bb:cc:00:11:22 192.168.3.191 android-abcdexyx123456 *
>>>
>>> Now, to my issue: I've been asked to setup a little WLAN for free
>>> "Computers 101" courses, and the WLAN does not have any kind of
>>> security (not my choice, BTW...). As you can imagine,
>>> an open WLAN is VERY attractive for freeloaders.
>>>
>>> I've been adding "dhcp-host=mac-address,ignore" entries for a
>>> while, but I've been wondering if I could, for example, ignore all
>>> DHCP requests from hosts with a client name like
>>> "android-<somethingsomething>" (because we're not teaching "how to
>>> use your Android smartphone", hence it must come from freeloaders) 
>>>
>>>
> 
> Hello again!
> 
> I've trying different forms for "dhcp-match", but none seems to work:
> 
> Example 1:
> dhcp-match=set:android,option:hostname,android*
> dhcp-ignore=tag:android
> 
> Example 2:
> dhcp-match=set:android,option:hostname,*android*
> dhcp-ignore=tag:android
> 
> Example 3:
> dhcp-match=set:android,12,*android*
> dhcp-ignore=tag:android
> 
> (since according to
> https://www.iana.org/assignments/bootp-dhcp-parameters/bootp-dhcp-parameters.xhtml
> tag 12 = "Hostname")
> 
> Whatever I try, it stills keeps giving DHCP leases for Android devices:
> dnsmasq-dhcp[1234]: DHCPACK(ethX) <ip addr> <mac> android-whatever1234
> 
> 
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> 

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