some printer can not obtain IP address

[li jun]

Today morning,something happened strangely,all the PC can obtain IP address
as usual from the DHCP server,but some printers can not. 
I looked up the log and found some  log  repeated as flowing: 
 
Jul 26 09:21:41 dhcp-svr dhcpd: DHCPREQUEST for 10.96.36.181 from
00:c0:ee:60:fd:4b (design_scaner) via 10.96.36.189
<mailto:dhcp-users at isc.org> 
Jul 26 09:21:41 dhcp-svr dhcpd: DHCPACK on 10.96.36.181 to 00:c0:ee:60:fd:4b
(design_scaner) via 10.96.36.189
Jul 26 09:21:41 dhcp-svr dhcpd: bind update on 10.96.36.181 got ack from
dhcpd-failover: xid mismatch.
09:21:42 dhcp-svr dhcpd: DHCPREQUEST for 10.96.36.181 from 00:c0:ee:60:fd:4b
(design_scaner) via 10.96.36.189
Jul 26 09:21:42 dhcp-svr dhcpd: DHCPACK on 10.96.36.181 to 00:c0:ee:60:fd:4b
(design_scaner) via 10.96.36.189
Jul 26 09:21:42 dhcp-svr dhcpd: bind update on 10.96.36.181 got ack from
dhcpd-failover: xid mismatch.
 
as the above logs shows,the printer(design_scaner) had obtained its ip,but
why it ask a ip address continously  
 
and here also a printer(hd03107) that can not obtain IP address's log:
 
Jul 26 10:19:11 dhcp-svr dhcpd: DHCPDISCOVER from 00:01:e6:9e:5e:97
(hd03107) via 10.96.37.189
Jul 26 10:19:12 dhcp-svr dhcpd: DHCPOFFER on 10.96.37.154 to 00:01:e6:9e:5e:
97 (hd03107) via 10.96.37.189

Jul 26 10:25:25 dhcp-svr dhcpd: DHCPDISCOVER from 00:01:e6:9e:5e:97
(hd03107) via 10.96.37.189
Jul 26 10:25:26 dhcp-svr dhcpd: DHCPOFFER on 10.96.37.154 to 00:01:e6:9e:5e:
97 (hd03107) via 10.96.37.189

Jul 26 10:25:29 dhcp-svr dhcpd: DHCPDISCOVER from 00:01:e6:9e:5e:97
(hd03107) via 10.96.37.189
Jul 26 10:25:29 dhcp-svr dhcpd: DHCPOFFER on 10.96.37.154 to 00:01:e6:9e:5e:
97 (hd03107) via 10.96.37.189
 
In a normal condition ,the client(hd03107) should send a DHCPREQUEST message
after the server's DHCPOFFER message's arrival.but the client started a new
process,who can tell
why？
 
Thanks in advance

 

 

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