[ale] dhcpd misbehaving?

Thu Apr 2 16:16:12 EDT 2015

Ok, I didn't go into the vlans enough.

Corp designated I use 172.27.0.0/16 for my network.  Instead of having 10
projects on one unmaintainable /16 I have broken it into /24's.
VLAN 800 is 172.27.0.0/24,  vlan 801 is 172.27.1.0/24, vlan 802 is
172.27.2.0/24, on through 172.27.10.0/24 currently.  My core router has the
different gateways on it for each vlan and configured a dhcpd helper
gateway address of 172.27.0.1.  As a result my named.conf has 10 included
configurations similar to the one I pasted for each vlan.  I'm not seeing
any bogons or martians.  When dhcpd goes stupid it does it for a couple
IP's ( seems random which subnet it begins on ) and then spirals out to
every subnet and all requests being ignored with the error messages I
pasted.

Robert

On Thu, Apr 2, 2015 at 1:57 PM Jim Kinney <jim.kinney at gmail.com> wrote:

> On Thu, 2015-04-02 at 12:43 -0700, Alex Carver wrote:
> > On 2015-04-02 12:27, Jim Kinney wrote:
> >
> > >>
> > >>   The problem I'm running into is dhcpd will work great for 3-5 days
> > >> and then all of a sudden start throwing errors:
> > >> Mar 30 15:50:01 basvc01 dhcpd: DHCPDISCOVER from c8:9c:dc:da:b4:bf via
> > >> 172.27.4.1: not responding (recovering)
> > >> Mar 30 15:50:01 basvc01 dhcpd: DHCPDISCOVER from 00:50:56:a0:57:aa via
> > >> 172.27.6.1: not responding (recovering)
> > >
> > > This is your gateway machine. Why is it on dhcp?
> >
> > Why is his gateway outside of the local subnet?  His machines are
> > 172.27.0.0/24 but his gateway is sitting outside of that.
>
> Looking at the dhcp address range, the gateway is in the network. But
> that 172.27.4.1 is not.
>
> I'm wondering if the gateway is also on the 172.27.4.0/24 network on
> another nic but badly misconfigured or it's using multiple IPs per nic.
> That will totally crap out dhcp discover.
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> --
> James P. Kinney III
>
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> gain at one end you lose at the other. It's like feeding a dog on his
> own tail. It won't fatten the dog.
> - Speech 11/23/1900 Mark Twain
>
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>
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