NetReg: Using 'deny duplicates'

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From: Mike.Lang@uconn.edu
Date: Thu Jan 30 2003 - 18:57:13 CST

Hello all,

I'm trying to configure my dhcp server from allowing multiple leases to
the same mac address on a network. I read in the man page of dhcpd.conf
that I can use the command 'deny duplicates' but so far I can't get it to
work.

I have defined it both as a global, and in a scope such as:

shared-network VLAN156 {
  subnet 137.99.156.0 netmask 255.255.252.0 {
    option routers 137.99.156.1;
    deny duplicates;
    # Known clients get this pool.
    pool {
      option domain-name-servers 137.99.x.x, 137.99.x.x;
      option broadcast-address 137.99.159.255;
      max-lease-time 604800;
      default-lease-time 604800;
      range 137.99.156.2 137.99.156.99;
      range 137.99.156.141 137.99.159.219;
      deny unknown clients;
    }
  }
  subnet 10.8.156.0 netmask 255.255.254.0 {
    option routers 10.8.156.1;
    deny duplicates;
    # Unknown clients get this pool.
    pool {
      option domain-name-servers 137.99.x.x;
      option broadcast-address 10.8.157.255;
      max-lease-time 120;
      default-lease-time 120;
      range 10.8.156.2 10.8.157.254;
      allow unknown clients;
    }
  }
}

In the syslog I constantly see logs such as....

Jan 30 19:47:39 netreg dhcpd: DHCPREQUEST for 137.99.155.72 from
00:08:74:e5:df:13 (D7G84421) via 137.99.152.1
Jan 30 19:47:39 netreg dhcpd: DHCPACK on 137.99.155.72 to
00:08:74:e5:df:13 (D7G84421) via 137.99.152.1
Jan 30 19:47:40 netreg dhcpd: DHCPDISCOVER from 00:08:74:e5:df:13
(D7G84421) via 137.99.152.1
Jan 30 19:47:40 netreg dhcpd: DHCPOFFER on 137.99.155.72 to
00:08:74:e5:df:13 (D7G84421) via 137.99.152.1
Jan 30 19:47:40 netreg dhcpd: DHCPREQUEST for 137.99.155.72 (137.99.25.25)
from 00:08:74:e5:df:13 (D7G84421) via 137.99.152.1
Jan 30 19:47:40 netreg dhcpd: DHCPACK on 137.99.155.72 to
00:08:74:e5:df:13 (D7G84421) via 137.99.152.1
Jan 30 19:47:51 netreg dhcpd: DHCPDISCOVER from 00:08:74:e5:df:13
(D7G84421) via 137.99.152.1
Jan 30 19:47:52 netreg dhcpd: DHCPOFFER on 137.99.154.214 to
00:08:74:e5:df:13 (D7G84421) via 137.99.152.1
Jan 30 19:47:52 netreg dhcpd: DHCPREQUEST for 137.99.154.214
(137.99.25.25) from 00:08:74:e5:df:13 (D7G84421) via 137.99.152.1
Jan 30 19:47:52 netreg dhcpd: DHCPACK on 137.99.154.214 to
00:08:74:e5:df:13 (D7G84421) via 137.99.152.1

The above MAC address got 2 IP Leases, I have 76 users getting either 2 or
3.

Can anyone help me out?

Thanks,

- Mike

Unviersity of Connecticut
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