[Dnsmasq-discuss] dhcp-host ignore help

Fri Jan 11 18:55:03 GMT 2013

On 11/01/13 18:42, Joe Giles wrote:
> On Fri, Jan 11, 2013 at 06:24:07PM +0000, Simon Kelley wrote:
>> 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.
>>
>>
>
> Ok, that will also make it simpler to create a php web script so non techie people here can add exclusions if they want :).
>
> These lines can be located anywhere in the config file, correct? So i can just append to the end of the file?
>

Yes, order doesn't matter.

Cheers,

Simon

> Thanks again for the help!!!
> Joe
>
>>> 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
>>>>>
>>>>> _______________________________________________
>>>>> Dnsmasq-discuss mailing list
>>>>> Dnsmasq-discuss at lists.thekelleys.org.uk
>>>>> http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
>>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Dnsmasq-discuss mailing list
>>>> Dnsmasq-discuss at lists.thekelleys.org.uk
>>>> http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
>>>
>>
>>
>> _______________________________________________
>> Dnsmasq-discuss mailing list
>> Dnsmasq-discuss at lists.thekelleys.org.uk
>> http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
>