already leased ip seems to be leased to another client

[Katsu Yamamoto]

Hi,

Our dhcp server appears to be acting strange lately.

Here is what's been happening:

IP 219.104.251.76 is leased to client-A with lease time of 14400 secs.
then...while client-A is using the address 219.104.251.76, the very same
IP address is leased to different client. So unfotunate client-A has to
request another available IP all over again.

following is the excerpt of daemonlog:

Mar 28 10:40:40 ****** dhcpd: DHCPDISCOVER from 00:0d:0b:e4:41:25 via 219.104.227.129
Mar 28 10:40:41 ****** dhcpd: DHCPOFFER on 219.104.251.76 to 00:0d:0b:e4:41:25 via 219.104.227.129
Mar 28 10:40:41 ****** dhcpd: DHCPREQUEST for 219.104.251.76 (211.125.60.112) from 00:0d:0b:e4:41:25 via 219.104.227.129
Mar 28 10:40:41 ****** dhcpd: DHCPACK on 219.104.251.76 to 00:0d:0b:e4:41:25 via 219.104.227.129
  :
(snip)
  :
Mar 28 11:28:22 ****** dhcpd: DHCPDISCOVER from 00:90:fe:58:04:23 via 219.104.227.129
Mar 28 11:28:23 ****** dhcpd: DHCPOFFER on 219.104.251.76 to 00:90:fe:58:04:23 (PCG-F70 Series) via 219.104.227.129
Mar 28 11:28:26 ****** dhcpd: DHCPDISCOVER from 00:90:fe:58:04:23 (PCG-F70 Series) via 219.104.227.129
Mar 28 11:28:26 ****** dhcpd: DHCPOFFER on 219.104.251.76 to 00:90:fe:58:04:23 (PCG-F70 Series) via 219.104.227.129
Mar 28 11:28:26 ****** dhcpd: DHCPREQUEST for 219.104.251.76 (211.125.60.112) from 00:90:fe:58:04:23 (PCG-F70 Series) via 219.104.227.129
Mar 28 11:28:26 ****** dhcpd: DHCPACK on 219.104.251.76 to 00:90:fe:58:04:23 (PCG-F70 Series) via 219.104.227.129
  :
(snip)
  :
Mar 28 12:40:33 ****** dhcpd: DHCPREQUEST for 219.104.251.76 from 00:0d:0b:e4:41:25 via hme0: lease 219.104.251.76 unavailable.
Mar 28 12:40:33 ****** dhcpd: DHCPNAK on 219.104.251.76 to 00:0d:0b:e4:41:25 via hme0
Mar 28 12:40:38 ****** dhcpd: DHCPREQUEST for 219.104.251.76 from 00:0d:0b:e4:41:25 via hme0: lease 219.104.251.76 unavailable.
Mar 28 12:40:38 ****** dhcpd: DHCPNAK on 219.104.251.76 to 00:0d:0b:e4:41:25 via hme0
Mar 28 14:10:30 ****** dhcpd: DHCPREQUEST for 219.104.251.76 from 00:0d:0b:e4:41:25 via 219.104.227.129: lease 219.104.251.76 unavailable.
Mar 28 14:10:30 ****** dhcpd: DHCPNAK on 219.104.251.76 to 00:0d:0b:e4:41:25 via 219.104.227.129
Mar 28 14:10:35 ****** dhcpd: DHCPREQUEST for 219.104.251.76 from 00:0d:0b:e4:41:25 via 219.104.227.129: lease 219.104.251.76 unavailable.
Mar 28 14:10:35 ****** dhcpd: DHCPNAK on 219.104.251.76 to 00:0d:0b:e4:41:25 via 219.104.227.129
Mar 28 14:10:40 ****** dhcpd: DHCPDISCOVER from 00:0d:0b:e4:41:25 via 219.104.227.129
Mar 28 14:10:45 ****** dhcpd: DHCPDISCOVER from 00:0d:0b:e4:41:25 via 219.104.227.129
Mar 28 14:10:46 ****** dhcpd: DHCPOFFER on 219.104.251.235 to 00:0d:0b:e4:41:25 via 219.104.227.129
Mar 28 14:10:46 ****** dhcpd: DHCPREQUEST for 219.104.251.235 (211.125.60.112) from 00:0d:0b:e4:41:25 via 219.104.227.129
Mar 28 14:10:46 ****** dhcpd: DHCPACK on 219.104.251.235 to 00:0d:0b:e4:41:25 via 219.104.227.129

We're told that client A(00:0d:0b:e4:41:25) has been powered-on all the time.
By the way, we are using dhcpd3.0.1rc4. I know it is an old version. But it has been
in service since 2002 and has been working perfectly well since then.

One more thing, this IP range has total of 253 ips, but 246 ips have been already
leased to clients. So only 7 ips are supposedly free...

Thanks in advance.

Katsu Yamamoto