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Today's Topics:
1. Re: client class parameters inside subnet decl? (V?clav Ovs?k)
2. Unknown client alerts and clients not getting IP addresses
(Fleming, Tony)
3. Re: Unknown client alerts and clients not getting IP
addresses (Simon Hobson)
----------------------------------------------------------------------
Message: 1
Date: Mon, 22 Aug 2016 15:18:46 +0200
From: V?clav Ovs?k <vaclav.ov...@i.cz>
To: dhcp-users@lists.isc.org
Subject: Re: client class parameters inside subnet decl?
Message-ID: <20160822131846.waq7kid327yernad@bobek.localdomain>
Content-Type: text/plain; charset=iso-8859-1
On Mon, Aug 22, 2016 at 10:25:27AM +0200, V?clav Ovs?k wrote:
> What a shame, there is no
>
> if member_of class
> options...
>
> Oh, maybe I can globaly set some option for class members and test it in
> subnet. I'm going to experiment with this ;)
FYI: This doesn't work. I tried
class "Alcatel-Lucent_IPTouch" {
match if option vendor-class-identifier = "alcatel.tsc-ip.0"
or option vendor-class-identifier = "alcatel.noe.0";
option user-class "classAlcatelIPT";
}
and then in subnet pool
if config-option user-class = "classAlcatelIPT"...
Maybe the order of evaluating is probably against this. :(
Regards
--
Zito
------------------------------
Message: 2
Date: Mon, 22 Aug 2016 22:30:18 +0000
From: "Fleming, Tony" <t.flem...@tcu.edu>
To: "dhcp-users@lists.isc.org" <dhcp-users@lists.isc.org>
Subject: Unknown client alerts and clients not getting IP addresses
Message-ID: <0334ba634af241d1a85984791e8a6...@exfs01-n8.tcu.edu>
Content-Type: text/plain; charset="us-ascii"
Good afternoon folks!
We ran into a problem today and it has me completely dumfounded
Background:
We create a host record for each device that connects to our
network
Over the years our dhcpd.conf file has grown due to little
purging (yeah - I know we should be purging the data)
Symptom:
Suddenly today, we began getting reports users are unable to
get an IP address.
The clients vary from iphones, to OS X and PC laptops
The issue doesn't seem to be OS or hardware
dependent
My logs are alerting:
dhcpd: DHCPDISCOVER FROM xx:xx:xx:xx:xx:xx via
x.x.x.x: uknown client
In my dhcpd file there is a "host" record for each device - so I am scratching
my head to why the device isn't getting an IP address.
Not all devices are having trouble getting IP leases
Workaround:
We have removed the directive in dhcpd.conf to "deny unknown
clients"
Now all of our devices are getting IP addresses.
Questions:
Has anyone experienced a problem like this?
If so, what did you find to be the root cause?
Is it possible my 300k line dhcpd.conf file is causing this
behavior?
Could there be a programmatic time-out
searching through host records in memory that is causing the host lookup to
fail?
Thank you.
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Message: 3
Date: Tue, 23 Aug 2016 08:29:22 +0100
From: Simon Hobson <dh...@thehobsons.co.uk>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: Unknown client alerts and clients not getting IP
addresses
Message-ID: <0c4b3cdf-fd20-41e9-bc3b-4f7ff40d5...@thehobsons.co.uk>
Content-Type: text/plain; charset=windows-1252
"Fleming, Tony" <t.flem...@tcu.edu> wrote:
> Background:
> We create a host record for each device that connects to our
> network
> Over the years our dhcpd.conf file has grown due to little
> purging (yeah ? I know we should be purging the data)
> Symptom:
> Suddenly today, we began getting reports users are unable to
> get an IP address.
> The clients vary from iphones, to OS X and PC laptops
> The issue doesn?t seem to be OS or hardware
> dependent
> My logs are alerting:
> dhcpd: DHCPDISCOVER FROM xx:xx:xx:xx:xx:xx
> via x.x.x.x: uknown client
> In my dhcpd file there is a ?host? record for each device ? so I am
> scratching my head to why the device isn?t getting an IP address.
> Not all devices are having trouble getting IP leases
> Workaround:
> We have removed the directive in dhcpd.conf to ?deny unknown
> clients?
> Now all of our devices are getting IP addresses.
Post your config - not all of it ;-)
But when you trim it, be very very careful that you don't alter the structure
at all.
Include a problem client - both it's config and the log entries for it.
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