2 dhcpd Instances on Same Platform? Take 2

[Simon Hobson]

John Wobus wrote:

>  > Yes, but you would need two physical interfaces, you would also need
>>  to have a mechanism in place to prevent the statically defined
>>  clients getting addresses in the dynamic pool. Assuming you have two
>>  ethernet ports, you could do :
>>
>>  dhcpd -lf leasefile0 -cf configfile0 eth0
>>  dhcpd -lf leasefile1 -cf configfile1 eth1
>
>
>If all requests come through helpers, would it be doable with a single
>interface?  We run only one instance per server, but it is on a
>secondary
>address.

Bear in mind that this is educated guesswork ...

Whilst in theory it should be possible, I think the way the ISC 
server is coded assumes that it will have to handle the local subnet, 
and therefore it must do the low level packet handling on the 
interface. Because some of the packets it is set up to handle are 
broadcast, they cannot be identified as belonging to any particular 
IP address in the physical port.

If you hacked the code and removed the bits that handle packets for 
the local network (and a few other changes) then I suppose it would 
work, but I've no idea how practical such a removal would be given 
how tightly integrated into the normal server operation it is.