no DHCPACK

[Beavis]

hello list,

 I have the following setup below:

dhcp-server <-->e0[fwall]e1<--[s3750]<-- dhcp-clients

whenever i tried to request for a lease from my clients i only get a
DHCPDISCOVER and DHCPOFFER but no DHCPACK traffic sent by the client.

Nov 15 15:01:04 proxy01 dhcpd: DHCPDISCOVER from 00:08:02:01:b7:36
(c8m3sibaa2njkd1) via 10.0.5.1
Nov 15 15:01:05 proxy01 dhcpd: DHCPOFFER on 10.0.5.50 to
00:08:02:01:b7:36 (c8m3sibaa2njkd1) via 10.0.5.1
Nov 15 15:01:08 proxy01 dhcpd: DHCPDISCOVER from 00:08:02:01:b7:36
(c8m3sibaa2njkd1) via 10.0.5.1
Nov 15 15:01:08 proxy01 dhcpd: DHCPOFFER on 10.0.5.50 to
00:08:02:01:b7:36 (c8m3sibaa2njkd1) via 10.0.5.1
Nov 15 15:01:16 proxy01 dhcpd: DHCPDISCOVER from 00:08:02:01:b7:36
(c8m3sibaa2njkd1) via 10.0.5.1
Nov 15 15:01:16 proxy01 dhcpd: DHCPOFFER on 10.0.5.50 to
00:08:02:01:b7:36 (c8m3sibaa2njkd1) via 10.0.5.1
Nov 15 15:01:33 proxy01 dhcpd: DHCPDISCOVER from 00:08:02:01:b7:36
(c8m3sibaa2njkd1) via 10.0.5.1
Nov 15 15:01:33 proxy01 dhcpd: DHCPOFFER on 10.0.5.50 to
00:08:02:01:b7:36 (c8m3sibaa2njkd1) via 10.0.5.1

is there anything else i might be missing on this? my clients are windowsxp's


regards,
-pf