Thank you.
Please let me know if you would like to see more of the configuration, but for now I am including one subnet and client configuration block.
class "Wired" {
match hardware;
}
class "Wireless" {
match hardware;
}
shared-network "STUWIRELESS-XXX" {
authoritative;
subnet 10.31.0.0 netmask 255.255.240.0 {
pool {
allow members of "Wireless";
default-lease-time 3600; #1 hour
max-lease-time 3600;
option ntp-servers X.X.X.X, X.X.X.Y;
option domain-name-servers X.X.X.X, X.X.X.Y;
one-lease-per-client true;
option routers 10.31.0.1;
deny unknown-clients;
range 10.31.0.20 10.31.15.254;
}
}
}
subclass "Wireless" 44:85:00:2F:81:86;
host XXXX.STUDENT.XXX.XXX {
hardware ethernet 44:85:00:2F:81:86;
}
Here is the logged output:
Aug 23 07:52:56 srvr04 dhcpd: DHCPDISCOVER from 44:85:00:2f:81:86 via 10.31.0.1: network STUWIRELESS-XXX: no free leases
Aug 23 07:53:00 srvr04 dhcpd: DHCPDISCOVER from 44:85:00:2f:81:86 via 10.31.0.1: network STUWIRELESS-XXX: no free leases
Aug 23 07:53:09 srvr04 dhcpd: DHCPDISCOVER from 44:85:00:2f:81:86 via 10.31.0.1: network STUWIRELESS-XXX: no free leases
Here is the lease status:
Ranges:
shared net name first ip last ip max cur percent touch t+c t+c perc
STUWIRELESS-XXX 10.31.0.20 - 10.31.15.254 4075 436
10.699 3639 4075 100.000
It appears I have plenty of IP addresses in this pool. It appears the look-up to match a known client is failing for some reason.
BTW,
I did clean-up a lot of dead host entries (cut the file size into 2/3rds of its original size), but still having the trouble.
Any help is appreciated.
Thank you.
-----Original Message-----
From: dhcp-users [mailto:[hidden email]] On Behalf Of Simon Hobson
Sent: Tuesday, August 23, 2016 2:29 AM
To: Users of ISC DHCP <[hidden email]>
Subject: Re: Unknown client alerts and clients not getting IP addresses
"Fleming, Tony" <[hidden email]> 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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