I think you guys are overlooking his statement that he does not control the 
DHCP server, and was looking to add multiple DHCP *clients* on a single 
interface using the same MAC in the DHCP requests. 

A few of us have stated multiple times is not currently possible with MikroTik. 
The solution is really to support DHCP client ID's, but as I stated MikroTik 
does not currently have this functionality.

--
Blake Covarrubias

On Nov 15, 2010, at 5:17 PM, Kristian Hoffmann wrote:

> I think Chupaka has posted on the MikroTik forms about having luck doing
> by turning RADIUS on for DHCP requests, and then setting up a freeradius
> server to handle the assignments.  You can set up freeradius to match
> just about anything.  Not the easiest thing in the world, but...
> 
> -Kristian
> 
> On Mon, 2010-11-15 at 16:33 -0700, Blake Covarrubias wrote:
>> A bit more detail…Matt also needs both DHCP clients to operate from the same 
>> source MAC address.
>> 
>> I sent him a solution that uses two MAC addresses on the same physical port 
>> and does not involve VLANs, although its obviously of no use because it does 
>> not meet his requirements.
>> 
>> What MikroTik needs is the ability to specify DHCP Client ID's when creating 
>> DHCP client instances. Most servers support using client ID's to identify 
>> hosts so this would be an acceptable way to issue two IPs to a single MAC as 
>> the client ID would be the identifier between the two.
>> 
>> --
>> Blake Covarrubias
>> 
>> On Nov 15, 2010, at 4:23 PM, Matt Jenkins wrote:
>> 
>>> In this instance, I have no control upstream beyond the mikrotik....
>>> 
>>> On 11/15/2010 03:16 PM, Josh Luthman wrote:
>>>> You can only have 1 dhcp server port per interface.  You'll need to do 
>>>> vlans.
>>>> 
>>>> On Nov 15, 2010 6:12 PM, "Matt Jenkins" <[email protected]> wrote:
>>>>> Ok simplification of what I need to do. I need to get more than 1 DHCP 
>>>>> address on the same physical ethernet port.... I can assign more than 1 
>>>>> static address, so why not more than 1 dynamic address?
>>>>> 
>>>>> On 11/02/2010 01:15 PM, Matt Jenkins wrote:
>>>>>> How do I create a subinterface on an ethernet port on a rb750?
>>>>>> 
>>>>>> Bridged CPE -> Tik Port1 -> Port2 Cust 1
>>>>>> -> Port3 Cust 2
>>>>>> 
>>>>>> I need to create two sub interfaces on Port 1. One for each customer to
>>>>>> receive an IP via DHCP. Then I need to NAT each of those sub interfaces
>>>>>> to each of cooresponding customer interfaces.
>>>>>> 
>>>>>> Thanks,
>>>>>> 
>>>>>> - Matt
>>>>>> 
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