DHCP Server hot handing out ips to everyone

[Guest]

[cstk421]

I am having issues with 90% of clients are not able to get an ip from the server. They receive a "cannot contact dhcp server" error. Wether or not they are plugged in directly to the network or through a wireless access point the same issue exists. Clients that have been able to get ip's can continue to do so after expiration of the lease without a problem. Have tried all the usual reboots, rebuild tcp/ip stack, clear arp, winsock, reinstall enet adapters to no avail. I am trying to find out why this issue exists as I would like to continue to use the EFW but I am considering just moving to PFSENSE.  I would appreciate any input or assistance.

Thank you,
Claudio

Network info

172.16.0.0/22
gateway
172.16.0.1
dns
172.16.0.1
DHCP RANGE
172.16.1.1 - 172.16.3.254
2 zones green and red are being used
red is static
proxy server is enable and working correctly
approximately 90 ip's are currently handed out and working
Static ips on client machines work without hitch


DHCP Does not work

some of the dhcp logs

Oct 17 15:25:37 dhcpd DHCPDISCOVER from 00:26:08:e8:04:3e via br0
Oct 17 15:25:37 dhcpd DHCPOFFER on 172.16.3.206 to 00:26:08:e8:04:3e via br0
Oct 17 15:25:46 dhcpd DHCPDISCOVER from 00:26:08:e8:04:3e via br0
Oct 17 15:25:46 dhcpd DHCPOFFER on 172.16.3.206 to 00:26:08:e8:04:3e via br0
Oct 17 15:25:50 dhcpd DHCPDISCOVER from 00:1f:e2:a7:21:7d (AllieShades) via br0
Oct 17 15:25:50 dhcpd DHCPOFFER on 172.16.2.211 to 00:1f:e2:a7:21:7d (AllieShades) via br0
Oct 17 15:25:51 dhcpd DHCPDISCOVER from 00:16:cf:73:ad:06 (acer-e692717cc7) via br0
Oct 17 15:25:51 dhcpd DHCPOFFER on 172.16.3.243 to 00:16:cf:73:ad:06 (acer-e692717cc7) via br0
Oct 17 15:25:52 dhcpd DHCPREQUEST for 172.16.1.220 (172.16.0.1) from 00:24:2b:2e:8a:b2 (Owner-PC) via br0
Oct 17 15:25:52 dhcpd DHCPACK on 172.16.1.220 to 00:24:2b:2e:8a:b2 (Owner-PC) via br0
Oct 17 15:25:58 dhcpd DHCPDISCOVER from 00:1c:df:c5:b3:15 (VALUED-3253602F) via br0
Oct 17 15:25:59 dhcpd DHCPOFFER on 172.16.2.213 to 00:1c:df:c5:b3:15 (VALUED-3253602F) via br0
Oct 17 15:26:03 dhcpd DHCPDISCOVER from 00:1c:df:c5:b3:15 (VALUED-3253602F) via br0
Oct 17 15:26:03 dhcpd DHCPOFFER on 172.16.2.213 to 00:1c:df:c5:b3:15 (VALUED-3253602F) via br0
Oct 17 15:26:08 dhcpd DHCPDISCOVER from 00:1c:df:c5:b3:15 (VALUED-3253602F) via br0
Oct 17 15:26:08 dhcpd DHCPOFFER on 172.16.2.213 to 00:1c:df:c5:b3:15 (VALUED-3253602F) via br0
Oct 17 15:26:15 dhcpd DHCPDISCOVER from 00:1f:3c:a0:79:81 (Ricardo-PC) via br0
Oct 17 15:26:16 dhcpd DHCPOFFER on 172.16.3.197 to 00:1f:3c:a0:79:81 (Ricardo-PC) via br0
Oct 17 15:26:19 dhcpd DHCPDISCOVER from 00:1f:3c:a0:79:81 (Ricardo-PC) via br0
Oct 17 15:26:19 dhcpd DHCPOFFER on 172.16.3.197 to 00:1f:3c:a0:79:81 (Ricardo-PC) via br0
Oct 17 15:26:25 dhcpd DHCPDISCOVER from 00:1c:df:c5:b3:15 (VALUED-3253602F) via br0
Oct 17 15:26:25 dhcpd DHCPOFFER on 172.16.2.213 to 00:1c:df:c5:b3:15 (VALUED-3253602F) via br0
Oct 17 15:26:25 dhcpd DHCPDISCOVER from 00:16:cf:73:ad:06 (acer-e692717cc7) via br0
Oct 17 15:26:25 dhcpd DHCPOFFER on 172.16.3.243 to 00:16:cf:73:ad:06 (acer-e692717cc7) via br0
Oct 17 15:26:27 dhcpd DHCPDISCOVER from 00:1f:3c:a0:79:81 (Ricardo-PC) via br0
Oct 17 15:26:27 dhcpd DHCPOFFER on 172.16.3.197 to 00:1f:3c:a0:79:81 (Ricardo-PC) via br0
Oct 17 15:26:34 dhcpd DHCPDISCOVER from 00:16:cf:73:ad:06 (acer-e692717cc7) via br0
Oct 17 15:26:34 dhcpd DHCPOFFER on 172.16.3.243 to 00:16:cf:73:ad:06 (acer-e692717cc7) via br0
Oct 17 15:26:35 dhcpd DHCPDISCOVER from 00:1c:bf:32:26:9e (DE-J4BL0F1) via br0
Oct 17 15:26:36 dhcpd DHCPOFFER on 172.16.1.222 to 00:1c:bf:32:26:9e (DE-J4BL0F1) via br0
Oct 17 15:26:38 dhcpd DHCPDISCOVER from 00:1c:bf:32:26:9e (DE-J4BL0F1) via br0
Oct 17 15:26:38 dhcpd DHCPOFFER on 172.16.1.222 to 00:1c:bf:32:26:9e (DE-J4BL0F1) via br0
Oct 17 15:26:39 dhcpd DHCPREQUEST for 172.16.1.210 from 00:02:6f:5e:c4:ba via br0
Oct 17 15:26:39 dhcpd DHCPACK on 172.16.1.210 to 00:02:6f:5e:c4:ba via br0
Oct 17 15:26:43 dhcpd DHCPDISCOVER from 00:1f:3c:a0:79:81 (Ricardo-PC) via br0
Oct 17 15:26:43 dhcpd DHCPOFFER on 172.16.3.197 to 00:1f:3c:a0:79:81 (Ricardo-PC) via br0
Oct 17 15:26:46 dhcpd DHCPDISCOVER from 00:1c:bf:32:26:9e (DE-J4BL0F1) via br0
Oct 17 15:26:46 dhcpd DHCPOFFER on 172.16.1.222 to 00:1c:bf:32:26:9e (DE-J4BL0F1) via br0
Oct 17 15:26:49 dhcpd DHCPDISCOVER from 00:16:cf:73:ad:06 (acer-e692717cc7) via br0
Oct 17 15:26:49 dhcpd DHCPOFFER on 172.16.3.243 to 00:16:cf:73:ad:06 (acer-e692717cc7) via br0
Oct 17 15:26:54 dhcpd DHCPDISCOVER from 00:26:08:e8:04:3e via br0
Oct 17 15:26:55 dhcpd DHCPOFFER on 172.16.3.206 to 00:26:08:e8:04:3e via br0
Oct 17 15:26:56 dhcpd DHCPDISCOVER from 00:26:08:e8:04:3e via br0
Oct 17 15:26:56 dhcpd DHCPOFFER on 172.16.3.206 to 00:26:08:e8:04:3e via br0
Oct 17 15:26:56 dhcpd DHCPDISCOVER from 00:1f:3a:1e:b8:2d (DCZXYKF1) via br0
Oct 17 15:26:57 dhcpd DHCPOFFER on 172.16.1.219 to 00:1f:3a:1e:b8:2d (DCZXYKF1) via br0
Oct 17 15:26:57 dhcpd DHCPDISCOVER from 00:1f:3a:99:d5:54 (DariusKelly) via br0
Oct 17 15:26:57 dhcpd DHCPREQUEST for 172.16.3.202 from 00:23:6c:93:87:d1 (SILVER-STALLION) via br0
Oct 17 15:26:57 dhcpd DHCPACK on 172.16.3.202 to 00:23:6c:93:87:d1 (SILVER-STALLION) via br0
Oct 17 15:26:58 dhcpd DHCPOFFER on 172.16.2.199 to 00:1f:3a:99:d5:54 (DariusKelly) via br0
Oct 17 15:26:58 dhcpd DHCPDISCOVER from 00:26:08:e8:04:3e via br0
Oct 17 15:26:58 dhcpd DHCPOFFER on 172.16.3.206 to 00:26:08:e8:04:3e via br0
Oct 17 15:27:00 dhcpd DHCPDISCOVER from 00:1f:3a:1e:b8:2d (DCZXYKF1) via br0
Oct 17 15:27:00 dhcpd DHCPOFFER on 172.16.1.219 to 00:1f:3a:1e:b8:2d (DCZXYKF1) via br0
Oct 17 15:27:01 dhcpd DHCPDISCOVER from 00:1f:3a:99:d5:54 (DariusKelly) via br0

HERE IS SPECIFICALLY THE DHCPAK RESPONSES

Oct 17 15:05:17 dhcpd DHCPACK on 172.16.1.209 to 00:21:63:ca:d4:6a (Extravagant-PC) via br0
Oct 17 15:05:22 dhcpd DHCPACK on 172.16.1.209 to 00:21:63:ca:d4:6a (Extravagant-PC) via br0
Oct 17 15:05:29 dhcpd DHCPACK on 172.16.1.209 to 00:21:63:ca:d4:6a (Extravagant-PC) via br0
Oct 17 15:05:44 dhcpd DHCPACK on 172.16.1.209 to 00:21:63:ca:d4:6a (Extravagant-PC) via br0
Oct 17 15:06:02 dhcpd DHCPACK on 172.16.1.235 to 00:02:6f:5f:11:4e via br0
Oct 17 15:06:57 dhcpd DHCPACK on 172.16.3.230 to 00:02:6f:5e:c4:b2 via br0
Oct 17 15:07:06 dhcpd DHCPACK on 172.16.3.206 to 00:26:08:e8:04:3e via br0
Oct 17 15:07:09 dhcpd DHCPACK on 172.16.1.254 to 00:13:f7:78:d9:87 (optiplex-gx270) via br0
Oct 17 15:07:13 dhcpd DHCPACK on 172.16.1.254 to 00:13:f7:78:d9:87 (optiplex-gx270) via br0
Oct 17 15:07:14 dhcpd DHCPACK on 172.16.1.251 to 00:22:b0:e4:a3:49 (greg-PC) via br0
Oct 17 15:07:19 dhcpd DHCPACK on 172.16.1.251 to 00:22:b0:e4:a3:49 (greg-PC) via br0
Oct 17 15:07:21 dhcpd DHCPACK on 172.16.1.254 to 00:13:f7:78:d9:87 (optiplex-gx270) via br0
Oct 17 15:07:26 dhcpd DHCPACK on 172.16.1.251 to 00:22:b0:e4:a3:49 (greg-PC) via br0
Oct 17 15:07:37 dhcpd DHCPACK on 172.16.1.254 to 00:13:f7:78:d9:87 (optiplex-gx270) via br0
Oct 17 15:07:42 dhcpd DHCPACK on 172.16.1.251 to 00:22:b0:e4:a3:49 (greg-PC) via br0
Oct 17 15:08:45 dhcpd DHCPACK on 172.16.2.224 to 00:02:6f:5f:12:a8 via br0
Oct 17 15:08:55 dhcpd DHCPACK on 172.16.1.224 to 00:02:6f:5f:11:52 via br0
Oct 17 15:09:55 dhcpd DHCPACK on 172.16.3.206 to 00:26:08:e8:04:3e via br0
Oct 17 15:10:04 dhcpd DHCPACK on 172.16.3.202 to 00:23:6c:93:87:d1 (SILVER-STALLION) via br0

[npeterson]

A DHCPACK is a responce from the server that its ok to use a address essentialy. There was most likely a DHCPREQUEST before this entry for the host pc. So the server is responding back. I would start looking up stream more for something blocking dhcp requests or a router or switch that relays dhcp requests. It may be your network cards as well, I have had many older 3com cards stop working with newer switches I've put in. if you have access to a sniffer, i would hook it up and watch the clients mac address and see if it is sending and receiving the DHCP offers correctly. If you see it sending and you see the dhcpack back to the pc, I would say its the nic.