single dhcp server with multiple subnets

[Daniel Hoffmann]

Greetings, Mike

You could use classes in order to mach the correct subnet to the requesting 
Client.
The Client does not know it's subnet, until it got an IP address.
For my own, i separate the classes depending on the relay address.

Best regards,
Daniel

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Am 26. Juli 2014 00:17:49 schrieb "Senko, Mike" <Mike.Senko at seattle.gov>:

> I've gone through the archives, but haven't found a solution to using a 
> single dhcp server
> to service multiple subnets.
>
> The subnets are set up on a router (non-cisco) that uses dhcp-relay to pass 
> dhcp requests
> through the configured switch interfaces. The switches are layer 2 and also 
> are configured
> for dhcp relay.
>
> The dhcp request packets show up at the server.
>
> The dhcp server then assigns and address and sends it to the router's address.
>
> The problem I've run into is the server is always sending the first dhcp 
> address in the first configured
> subnet regardless of the subnet the request comes from.
>
> In other words, dhcp ip address assigned is always 10.1.6.200 even if the 
> request comes from 10.1.8.0 subnet.
>
> If the dhcp request comes from the 10.1.6.0 subnet, all is fine.
>
> I think the problem is in the dhcp server configuration:
>
> option domain-name "TestLab.NSC";
>
> default-lease-time 600;
>
> max-lease-time 7200;
>
> authoritative;
>
> log-facility local7;
>
> subnet 10.1.6.0 netmask 255.255.255.0 {
>
> option routers 10.1.6.2;
>
> range 10.1.6.200 10.1.6.254;
>
> option subnet-mask 255.255.255.0;
>
> }
>
> subnet 10.1.7.0 netmask 255.255.255.0 {
>
> option routers 10.1.6.2;
>
> range 10.1.7.200 10.1.7.254;
>
> option subnet-mask 255.255.255.0;
>
> }
>
> subnet 10.1.8.0 netmask 255.255.255.0 {
>
> option routers 10.1.6.2;
>
> range 10.1.8.200 10.1.8.254;
>
> option subnet-mask 255.255.255.0;
>
> }
>
> subnet 10.1.9.0 netmask 255.255.255.0 {
>
> option routers 10.1.6.2;
>
> range 10.1.9.200 10.1.9.254;
>
> option subnet-mask 255.255.255.0;
>
> }
>
> subnet 10.1.5.0 netmask 255.255.255.0 {
>
> option routers 10.1.6.2;
>
> range 10.1.5.200 10.1.5.254;
>
> option subnet-mask 255.255.255.0;
>
> }
>
> This is the entire configuration, there must be something missing. I'm not 
> using dns, just trying to get addresses assigned
> to the right vlan/subnet. The server is attached to 10.1.6.0/24.
>
> Thanks, ms
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