single dhcp server with multiple subnets

[José Queiroz]

Did you saw that this file contains password information, don't you?


2014-07-30 13:33 GMT-03:00 Senko, Mike <Mike.Senko at seattle.gov>:

> The switch configuration is attached.
>
> It's really pretty basic, it's a rugged com switch, menu driven/selection.
> I've configured the dhcp relay agent and the ports where the clients and
> server reside. Hmm, I'll move the server to a different port to
> differentiate client/server a little more but have low expectations for
> success.
>
> Mike
>
> -----Original Message-----
> From: dhcp-users-bounces at lists.isc.org [mailto:
> dhcp-users-bounces at lists.isc.org] On Behalf Of Joseph Bernard
> Sent: Wednesday, July 30, 2014 8:48 AM
> To: Users of ISC DHCP
> Subject: Re: single dhcp server with multiple subnets
>
> 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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> > <dhcpd.conf><syslog>_______________________________________________
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