[ale] dhcpd to multiple vlans from one server

Fri Jan 23 11:18:37 EST 2015

I think that was a response to my many multi port cards solution.
On Jan 23, 2015 11:12 AM, "Michael Still" <stillwaxin at gmail.com> wrote:

> Uhm I've described exactly the way to do what you are describing. That is
> unless we are misunderstanding each other.
>
>
> On Fri, Jan 23, 2015 at 10:47 AM, Robert L. Harris <
> robert.l.harris at gmail.com> wrote:
>
>>
>> The catch though I'd the server was going to be a trunk withone
>> interface.  It wouldn't have a separate physical interface on each lan.  I
>> was hoping one ip/interface could handle multiple vlans through the
>> dhcp.conf.  (I.e. an option line in the subnet descriptor block )
>>
>> Doesn't appear to be the case though.
>>
>> Robert
>>
>> On Fri, Jan 23, 2015, 08:37 Michael Still <stillwaxin at gmail.com> wrote:
>>
>>> You don't need to do anything fancy here. This functionality is built
>>> into isc-dhcpd. Just tell your routers in each subnet to relay dhcp to your
>>> dhcp server ip and put this kinda stuff in your config:
>>> group foo {
>>>  option domain-name "mydomain.name";
>>>  option domain-name-servers myrecursivednsserver1, myrecursivednsserver2;
>>>  option ntp-servers myntpserver1, myntpserver2;
>>>  default-lease-time 3600;
>>>  max-lease-time 3600;
>>>
>>>  shared-network network1 {   <--- VLANX
>>>    subnet 172.16.0.0 netmask 255.255.255.192 {
>>>      range 172.16.0.10 172.16.0.20;
>>>      option routers 172..16.0.1;
>>>      option subnet-mask 255.255.255.192;
>>>    }
>>>  }
>>>
>>>  shared-network network2 {  <--- VLANY
>>>    subnet 192.168.0.0 netmask 255.255.255.192 {
>>>      range 192.168.0.10 192.168.0.20;
>>>      option option-150 myvoipboxip;
>>>      option routers 192.168.0.1;
>>>      option subnet-mask 255.255.255.192;
>>>   }
>>>  }
>>>
>>> Every router will source a *new* packet using the interface IP from the
>>> subnet it *received* the dhcp request on so the dhcp server knows which
>>> pool to use to issue IPs to the clients. I ran a global network with 2x
>>> dhcp servers this way.
>>>
>>>
>>> On Thu, Jan 22, 2015 at 11:57 PM, Robert L. Harris <
>>> robert.l.harris at gmail.com> wrote:
>>>
>>>>   That looks like what I'm looking for.
>>>>
>>>>
>>>> On Thu Jan 22 2015 at 9:26:43 PM James Sumners <james.sumners at gmail.com>
>>>> wrote:
>>>>
>>>>> It's something you would take care of at the switch level if you don't
>>>>> want to have an interface per vlan on your DHCP server --
>>>>> https://lists.isc.org/pipermail/dhcp-users/2006-August/001509.html
>>>>>
>>>>> On Thu, Jan 22, 2015 at 7:37 PM, Robert L. Harris <
>>>>> robert.l.harris at gmail.com> wrote:
>>>>>
>>>>>> Ok, so if I have 2 subnets:
>>>>>>
>>>>>> 172.20.1/24 on vlan 21
>>>>>> 172.20.2/24 on vlan 22
>>>>>>
>>>>>> If a host plugs into a port assigned to vlan 22, how do I make sure
>>>>>> dhcpd gives out the right address?  That's the part of the designation I'm
>>>>>> missing.
>>>>>>
>>>>>> Robert
>>>>>>
>>>>>>
>>>>>> On Thu Jan 22 2015 at 5:17:25 PM James Sumners <
>>>>>> james.sumners at gmail.com> wrote:
>>>>>>
>>>>>>> You just have to define the subnets in the config and put each
>>>>>>> subnet's pool within its respective block. No need for aliased IPs.
>>>>>>>
>>>>>>> On Thursday, January 22, 2015, Robert L. Harris <
>>>>>>> robert.l.harris at gmail.com> wrote:
>>>>>>>
>>>>>>>>
>>>>>>>> Anyone have a dhcpd serving multiple subnets to multiple vlans from
>>>>>>>> a single server on a trunk they can share configs?  I don't want to spawn a
>>>>>>>> bunch of servers and if I can do it with a single interface that would be
>>>>>>>> ideal.  If I have to go with eth0.0, eth0.1, etc that's a good second
>>>>>>>> choice.
>>>>>>>>
>>>>>>>> Robert
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> James Sumners
>>>>>>> http://james.sumners.info/ (technical profile)
>>>>>>> http://jrfom.com/ (personal site)
>>>>>>> http://haplo.bandcamp.com/ (band page)
>>>>>>>
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>>>>>>
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>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> James Sumners
>>>>> http://james.sumners.info/ (technical profile)
>>>>> http://jrfom.com/ (personal site)
>>>>> http://haplo.bandcamp.com/ (band page)
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>>>>
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>>>
>>>
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>
>
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> [stillwaxin at gmail.com ~]$
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