[ale] dhcpd to multiple vlans from one server

[stillwaxin at gmail.com (Michael Still)]

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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>> [stillwaxin at gmail.com ~]$
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>
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