single dhcp server with multiple subnets

[Joseph Bernard]

Can you attach the config for your switch?

Thanks,
Joseph B.

On Jul 30, 2014, at 11:40 AM, Senko, Mike <Mike.Senko at seattle.gov> wrote:

> Spent the day yesterday working on the issue and decided to break the network down to more basic elements
> to try to at least cross vlans for dhcp requests.
> 
> I reconfigured the network so both the dhcp server and dhcp client are on the same network switch.
> 
> I placed the dhcp server in vlan6, as before and placed the dhcp client in vlan 7 (or 8 or 5). 
> The DHCP server receives the dhcp request and assigns an address, always for its own vlan, vlan6 as evidenced in the syslog
> messages.
> 
> It suggests the dhcp relay agent is not passing on the vlan/subnet information from the client. I don't know what else to think
> at the moment.
> 
> This is my first time setting up a dhcp server, if anyone can critique the dhcpd.conf configuration I can at least eliminate that from my troubleshooting. I have attached both the Config and syslog outputs to this email.
> 
> Thanks,
> 
> Mike
> 
> -----Original Message-----
> From: dhcp-users-bounces at lists.isc.org [mailto:dhcp-users-bounces at lists.isc.org] On Behalf Of Simon Hobson
> Sent: Tuesday, July 29, 2014 12:16 AM
> To: Users of ISC DHCP
> Subject: Re: single dhcp server with multiple subnets
> 
> "Senko, Mike" <Mike.Senko at seattle.gov> wrote:
> 
>> Jul 28 11:48:06 TestLabPC dhcpd: DHCPDISCOVER from b4:b5:2f:29:d1:c9 
>> (SCL2304L) via 10.1.6.2 Jul 28 11:48:07 TestLabPC dhcpd: DHCPOFFER on 
>> 10.1.6.200 to b4:b5:2f:29:d1:c9 (SCL2304L) via 10.1.6.2
> 
>> 13:00:53.378085 IP 10.1.6.2.43408 > 10.1.6.56.bootps: BOOTP/DHCP, 
>> Request from b4:b5:2f:29:d1:c9 (oui Unknown), length 303
>> 13:00:54.379236 IP 10.1.6.56.bootps > 10.1.6.2.bootps: BOOTP/DHCP, 
>> Reply, length 300
> 
>> If I connect the laptop to the same switch as the dhcp server switch, 
>> vlan6 (10.1.6.0/24), the laptop picks up the address 10.1.6.200 - as 
>> expected
> 
> It looks like you still do not have your network setup correctly. I know from experience that some switches are "not very intuitive" when setting up VLANs :(
> 
> I would suggest manually configuring 1 or more devices with IP addresses appropriate to the network they *should* be in and get the network correct. Once you fix that then you should find the DHCP "just works".
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