[Dnsmasq-discuss] dhcp-host ignore help

Fri Jan 11 18:24:07 GMT 2013

On 11/01/13 18:10, Joe Giles wrote:
> On Fri, Jan 11, 2013 at 04:40:19PM +0000, Simon Kelley wrote:
>> On 11/01/13 00:25, Joe Giles wrote:
>>> Hi List,
>>>
>>> I have been needing a dhcp proxy in our environment spicifically to proxy pxe requests to a tftp server. I am using
>>> RHEL6.3 and have the following versions installed:
>>>
>>> dnsmasq-2.48-6.el6.x86_64
>>>
>>> I have also tried the latest to see if there were bugs related to this that got fixed.
>>>
>>> The DHCP server is another Linux server and uses next-server to pass requests to the proxy DHCP server (dnsmasq server)
>>> and for the most part works like a charm.
>>>
>>> However, I am not able to ignore spicific hosts based on mac address. Here is my conf file:
>>>
>>> port=0
>>> listen-address=192.168.0.5
>>> log-dhcp
>>> tftp-root=/var/lib/tftpboot
>>> dhcp-boot=pxelinux.0
>>> dhcp-option=vendor:PXEClient,6,2b
>>> dhcp-no-override
>>> pxe-prompt="Press F8 for boot menu", 0
>>> pxe-service=X86PC, "Boot from network", pxelinux
>>> pxe-service=X86PC, "Boot from local hard disk", 0
>>> dhcp-host=1c:c1:de:20:3b:0a,ignore
>>> dhcp-range=192.168.0.5,proxy
>>>
>>> As you can see, I have a host listed with mac address and ignore listed. But, when this host network boots, it
>>> is still routed to the pxelinux menus.
>>>
>>> I have tried the follownig - Not all at once, however:
>>>
>>> dhcp-host=1c:c1:de:20:3b:0a,net:nopxe
>>>
>>> and
>>>
>>> dhcp-ignore=tobeignored
>>> dhcp-mac=tobeignored,1c:c1:de:20:3b:0a
>>
>>
>> Try
>>
>> dhcp-ignore=tag:tobeignored
>> dhcp-mac=set:tobeignored,1c:c1:de:20:3b:0a
>>
>>
>> That _should_ work, I think.
>>
>>
>> Cheers,
>>
>> Simon.
>>
>
> Thanks Simon!
>
> That worked like a charm...
>
> One more question...
>
> Can I use multiple macs and seperate with a comma, like so:
>
> dhcp-mac=set:tobeignored,1c:c1:de:20:3b:0a,1c:c1:de:20:3b:0b,dhcp-mac=set:tobeignored,1c:c1:de:20:3b:0c
>
> etc...
>

do it like this:

dhcp-mac=set:tobeignored,1c:c1:de:20:3b:0a
dhcp-mac=set:tobeignored,1c:c1:de:20:3b:0b
dhcp-mac=set:tobeignored:1c:c1:de:20:3b:0c

You can also use wildcards in the mac address, if that helps.

Cheers,

Simon.

> Thanks again!
> Joe
>
>>>
>>> Neither of these work.
>>>
>>> Here are some bits from my log:
>>>
>>> Jan 10 10:15:46 DL380G7G44U10 dnsmasq-dhcp[24739]: 3743431434 Available DHCP subnet: 192.168.0.5/255.255.255.0
>>> Jan 10 10:15:46 DL380G7G44U10 dnsmasq-dhcp[24739]: 3743431434 Vendor class: PXEClient:Arch:00000:UNDI:002001
>>> Jan 10 10:15:46 DL380G7G44U10 dnsmasq-dhcp[24739]: 3743431434 PXE(eth1) 1c:c1:de:20:3b:0a proxy
>>> Jan 10 10:15:46 DL380G7G44U10 dnsmasq-dhcp[24739]: 3743431434 tags: known, eth1
>>> Jan 10 10:15:46 DL380G7G44U10 dnsmasq-dhcp[24739]: 3743431434 bootfile name: pxelinux.0
>>> Jan 10 10:15:46 DL380G7G44U10 dnsmasq-dhcp[24739]: 3743431434 sent size:  1 option: 53:message-type  05
>>> Jan 10 10:15:46 DL380G7G44U10 dnsmasq-dhcp[24739]: 3743431434 sent size:  4 option: 54:server-identifier  192.168.0.5
>>> Jan 10 10:15:46 DL380G7G44U10 dnsmasq-dhcp[24739]: 3743431434 sent size:  9 option: 60:vendor-class  50:58:45:43:6c:69:65:6e:74
>>> Jan 10 10:15:46 DL380G7G44U10 dnsmasq-dhcp[24739]: 3743431434 sent size: 17 option: 97:client-machine-id  00:35:38:33:39:31:34:55:53:45:30:35:30...
>>> Jan 10 10:15:46 DL380G7G44U10 dnsmasq-dhcp[24739]: 3743431434 sent size: 82 option: 43:vendor-encap  06:01:02:09:30:80:00:11:42:6f:6f:74:20...
>>> Jan 10 10:15:47 DL380G7G44U10 dnsmasq-dhcp[24739]: 3743431434 Available DHCP subnet: 192.168.0.5/255.255.255.0
>>> Jan 10 10:15:47 DL380G7G44U10 dnsmasq-dhcp[24739]: 3743431434 Vendor class: PXEClient:Arch:00000:UNDI:002001
>>> Jan 10 10:15:47 DL380G7G44U10 dnsmasq-dhcp[24739]: 3743431434 PXE(eth1) 192.168.0.101 1c:c1:de:20:3b:0a pxelinux.0
>>> Jan 10 10:15:47 DL380G7G44U10 dnsmasq-dhcp[24739]: 3743431434 tags: known, eth1
>>> Jan 10 10:15:47 DL380G7G44U10 dnsmasq-dhcp[24739]: 3743431434 bootfile name: pxelinux.0
>>> Jan 10 10:15:47 DL380G7G44U10 dnsmasq-dhcp[24739]: 3743431434 next server: 192.168.0.5
>>> Jan 10 10:15:47 DL380G7G44U10 dnsmasq-dhcp[24739]: 3743431434 sent size:  1 option: 53:message-type  05
>>> Jan 10 10:15:47 DL380G7G44U10 dnsmasq-dhcp[24739]: 3743431434 sent size:  4 option: 54:server-identifier  192.168.0.5
>>> Jan 10 10:15:47 DL380G7G44U10 dnsmasq-dhcp[24739]: 3743431434 sent size:  9 option: 60:vendor-class  50:58:45:43:6c:69:65:6e:74
>>> Jan 10 10:15:47 DL380G7G44U10 dnsmasq-dhcp[24739]: 3743431434 sent size: 17 option: 97:client-machine-id  00:35:38:33:39:31:34:55:53:45:30:35:30...
>>> Jan 10 10:15:47 DL380G7G44U10 dnsmasq-dhcp[24739]: 3743431434 sent size: 35 option: 43:vendor-encap  47:04:80:00:00:00:0a:17:00:50:72:65:73...
>>> Jan 10 10:15:47 DL380G7G44U10 snmpd[1979]: Connection from UDP: [127.0.0.1]:42914->[127.0.0.1]
>>> ...
>>>
>>>
>>> As you can see, it sees the correct mac address, but looks like it converts it to some sort of ID. So, I tried this:
>>>
>>>
>>> dhcp-host=1c:c1:de:20:3b:0a,id:*,ignore
>>>
>>> and this did not work either.
>>>
>>> Anyone have any ideas how I can get this to work?
>>>
>>> Thanks so much!
>>> Joe
>>>
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>>> Dnsmasq-discuss at lists.thekelleys.org.uk
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>>>
>>
>>
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