I have a CentOS 5 system running DHCP for several subnets. In /var/log/messages, I'm seeing constant DHCPINFORM, DHCPACK and DHCPREQUEST messages. I don't understand why these requests are more frequent here than in other installations. The messages come in bursts every few seconds, resulting in extremely large logfiles.
The bulk of the devices here are wireless handheld devices (using a Windows CE TCP stack). I'd appreciate any insight into quelling the constant messages.
/etc/dhcpd.conf
default-lease-time 28800;
authoritative;
allow bootp;
ddns-update-style none;
option subnet-mask 255.255.255.0;
option domain-name-servers 10.1.1.3;
option domain-name "xxxinc.com";
option tftp-server-name "10.1.1.3";
option ntp-servers 17.151.16.21;
subnet 10.1.1.0 netmask 255.255.255.0 {
range dynamic-bootp 10.1.1.120 10.1.1.211;
option tftp-server-name "10.1.1.3";
next-server 10.1.1.3;
filename "/dsl/pxelinux.0";
option routers 10.1.1.1;
}
subnet 10.1.2.0 netmask 255.255.255.0 {
range dynamic-bootp 10.1.2.130 10.1.2.199;
option tftp-server-name "10.1.1.3";
next-server 10.1.1.3;
filename "/dsl/pxelinux.0";
option routers 10.1.2.1;
}
/var/log/messages
Apr 4 10:59:44 General dhcpd: DHCPINFORM from 10.1.1.136 via eth0
Apr 4 10:59:44 General dhcpd: DHCPACK to 10.1.1.136 (00:16:35:07:1e:61) via eth0
Apr 4 10:59:44 General dhcpd: DHCPINFORM from 10.1.1.136 via eth0
Apr 4 10:59:44 General dhcpd: DHCPACK to 10.1.1.136 (00:16:35:07:1e:61) via eth0
Apr 4 10:59:44 General dhcpd: DHCPINFORM from 10.1.1.136 via 10.1.1.254
Apr 4 10:59:44 General dhcpd: DHCPACK to 10.1.1.136 (00:16:35:07:1e:61) via eth0
Apr 4 10:59:44 General dhcpd: DHCPINFORM from 10.1.1.136 via 10.1.1.254
Apr 4 10:59:44 General dhcpd: DHCPACK to 10.1.1.136 (00:16:35:07:1e:61) via eth0
Apr 4 10:59:44 General dhcpd: DHCPINFORM from 10.1.1.136 via 10.1.1.2
Apr 4 10:59:44 General dhcpd: DHCPACK to 10.1.1.136 (00:16:35:07:1e:61) via eth0
Apr 4 10:59:46 General dhcpd: DHCPREQUEST for 10.1.1.137 from 00:15:70:85:9b:ea via eth0
Apr 4 10:59:46 General dhcpd: DHCPACK on 10.1.1.137 to 00:15:70:85:9b:ea via eth0
Apr 4 10:59:46 General dhcpd: DHCPREQUEST for 10.1.1.137 from 00:15:70:85:9b:ea via eth0
Apr 4 10:59:46 General dhcpd: DHCPACK on 10.1.1.137 to 00:15:70:85:9b:ea via eth0
Apr 4 10:59:46 General dhcpd: DHCPREQUEST for 10.1.1.137 from 00:15:70:85:9b:ea via 10.1.1.254
Apr 4 10:59:46 General dhcpd: DHCPACK on 10.1.1.137 to 00:15:70:85:9b:ea via 10.1.1.254
Apr 4 10:59:46 General dhcpd: DHCPREQUEST for 10.1.1.137 from 00:15:70:85:9b:ea via 10.1.1.254
Apr 4 10:59:46 General dhcpd: DHCPACK on 10.1.1.137 to 00:15:70:85:9b:ea via 10.1.1.254
Apr 4 10:59:46 General dhcpd: DHCPREQUEST for 10.1.1.137 from 00:15:70:85:9b:ea via 10.1.1.2
Apr 4 10:59:46 General dhcpd: DHCPACK on 10.1.1.137 to 00:15:70:85:9b:ea via 10.1.1.2
Apr 4 10:59:47 General dhcpd: DHCPINFORM from 10.1.2.193 via 10.1.2.1
Apr 4 10:59:47 General dhcpd: DHCPACK to 10.1.2.193 (00:1a:4b:c0:e0:a4) via eth0
Apr 4 10:59:47 General dhcpd: DHCPINFORM from 10.1.1.147 via eth0
Apr 4 10:59:47 General dhcpd: DHCPACK to 10.1.1.147 (00:19:bb:d3:bc:e8) via eth0
Apr 4 10:59:47 General dhcpd: DHCPINFORM from 10.1.1.147 via eth0
Apr 4 10:59:47 General dhcpd: DHCPACK to 10.1.1.147 (00:19:bb:d3:bc:e8) via eth0
Apr 4 10:59:47 General dhcpd: DHCPINFORM from 10.1.1.147 via 10.1.1.254
Apr 4 10:59:47 General dhcpd: DHCPACK to 10.1.1.147 (00:19:bb:d3:bc:e8) via eth0
Apr 4 10:59:47 General dhcpd: DHCPINFORM from 10.1.1.147 via 10.1.1.254
Apr 4 10:59:47 General dhcpd: DHCPACK to 10.1.1.147 (00:19:bb:d3:bc:e8) via eth0
Apr 4 10:59:47 General dhcpd: DHCPINFORM from 10.1.1.147 via 10.1.1.2
Apr 4 10:59:47 General dhcpd: DHCPACK to 10.1.1.147 (00:19:bb:d3:bc:e8) via eth0
Apr 4 10:59:49 General dhcpd: DHCPREQUEST for 10.1.1.198 from 00:15:70:86:dc:b9 via eth0
Apr 4 10:59:49 General dhcpd: DHCPACK on 10.1.1.198 to 00:15:70:86:dc:b9 via eth0
Apr 4 10:59:49 General dhcpd: DHCPREQUEST for 10.1.1.198 from 00:15:70:86:dc:b9 via eth0
Apr 4 10:59:49 General dhcpd: DHCPACK on 10.1.1.198 to 00:15:70:86:dc:b9 via eth0
Apr 4 10:59:49 General dhcpd: DHCPREQUEST for 10.1.1.198 from 00:15:70:86:dc:b9 via 10.1.1.254
Apr 4 10:59:49 General dhcpd: DHCPACK on 10.1.1.198 to 00:15:70:86:dc:b9 via 10.1.1.254
Apr 4 10:59:49 General dhcpd: DHCPREQUEST for 10.1.1.198 from 00:15:70:86:dc:b9 via 10.1.1.254
Apr 4 10:59:49 General dhcpd: DHCPACK on 10.1.1.198 to 00:15:70:86:dc:b9 via 10.1.1.254
Apr 4 10:59:49 General dhcpd: DHCPREQUEST for 10.1.1.198 from 00:15:70:86:dc:b9 via 10.1.1.2
Apr 4 10:59:49 General dhcpd: DHCPACK on 10.1.1.198 to 00:15:70:86:dc:b9 via 10.1.1.2
UPDATE
I've removed some extraneous ip helper-address
entries from some the DHCP server-side routers. Much of the traffic has subsided, however I'm still getting a lot of DHCPINFORM,DHCPACK...
Oct 26 17:22:23 General dhcpd: DHCPINFORM from 10.1.1.140 via eth0
Oct 26 17:22:23 General dhcpd: DHCPACK to 10.1.1.140 (00:16:35:07:1e:2c) via eth0
Oct 26 17:22:27 General dhcpd: DHCPINFORM from 10.1.1.147 via eth0
Oct 26 17:22:27 General dhcpd: DHCPACK to 10.1.1.147 (00:19:bb:d3:bc:e8) via eth0
Oct 26 17:22:27 General dhcpd: DHCPINFORM from 10.1.1.140 via eth0
Oct 26 17:22:27 General dhcpd: DHCPACK to 10.1.1.140 (00:16:35:07:1e:2c) via eth0
Oct 26 17:22:39 General dhcpd: DHCPINFORM from 10.1.1.182 via eth0
Oct 26 17:22:39 General dhcpd: DHCPACK to 10.1.1.182 (00:19:bb:d3:ec:f1) via eth0
Oct 26 17:22:43 General dhcpd: DHCPINFORM from 10.1.1.182 via eth0
Oct 26 17:22:43 General dhcpd: DHCPACK to 10.1.1.182 (00:19:bb:d3:ec:f1) via eth0
Oct 26 17:22:49 General dhcpd: DHCPINFORM from 10.1.2.198 via 10.1.2.1
Oct 26 17:22:49 General dhcpd: DHCPACK to 10.1.2.198 (00:1e:0b:79:e5:15) via eth0
Oct 26 17:23:01 General dhcpd: DHCPINFORM from 10.1.1.194 via eth0
Oct 26 17:23:01 General dhcpd: DHCPACK to 10.1.1.194 (00:1e:0b:7b:2d:d6) via eth0
Oct 26 17:23:04 General dhcpd: DHCPINFORM from 10.1.1.136 via eth0
Oct 26 17:23:04 General dhcpd: DHCPACK to 10.1.1.136 (00:16:35:07:1e:61) via eth0
Oct 26 17:23:07 General dhcpd: DHCPINFORM from 10.1.1.136 via eth0
Oct 26 17:23:07 General dhcpd: DHCPACK to 10.1.1.136 (00:16:35:07:1e:61) via eth0
Oct 26 17:23:09 General dhcpd: DHCPINFORM from 10.1.2.193 via 10.1.2.1
Oct 26 17:23:09 General dhcpd: DHCPACK to 10.1.2.193 (00:1a:4b:c0:e0:a4) via eth0
Oct 26 17:23:12 General dhcpd: DHCPINFORM from 10.1.2.179 via 10.1.2.1
Oct 26 17:23:12 General dhcpd: DHCPACK to 10.1.2.179 (00:19:bb:d3:f6:26) via eth0
Oct 26 17:23:13 General dhcpd: DHCPINFORM from 10.1.2.193 via 10.1.2.1
Oct 26 17:23:13 General dhcpd: DHCPACK to 10.1.2.193 (00:1a:4b:c0:e0:a4) via eth0
Oct 26 17:23:15 General dhcpd: DHCPINFORM from 10.1.2.179 via 10.1.2.1
Oct 26 17:23:15 General dhcpd: DHCPACK to 10.1.2.179 (00:19:bb:d3:f6:26) via eth0
Oct 26 17:23:36 General dhcpd: DHCPINFORM from 10.1.1.140 via eth0
Oct 26 17:23:36 General dhcpd: DHCPACK to 10.1.1.140 (00:16:35:07:1e:2c) via eth0
Oct 26 17:23:37 General dhcpd: DHCPINFORM from 10.1.1.147 via eth0
Oct 26 17:23:37 General dhcpd: DHCPACK to 10.1.1.147 (00:19:bb:d3:bc:e8) via eth0
Oct 26 17:23:40 General dhcpd: DHCPINFORM from 10.1.1.140 via eth0
Oct 26 17:23:40 General dhcpd: DHCPACK to 10.1.1.140 (00:16:35:07:1e:2c) via eth0
Oct 26 17:23:41 General dhcpd: DHCPINFORM from 10.1.1.147 via eth0
Oct 26 17:23:41 General dhcpd: DHCPACK to 10.1.1.147 (00:19:bb:d3:bc:e8) via eth0
Oct 26 17:23:50 General dhcpd: DHCPINFORM from 10.1.2.198 via 10.1.2.1
Oct 26 17:23:50 General dhcpd: DHCPACK to 10.1.2.198 (00:1e:0b:79:e5:15) via eth0
Oct 26 17:23:51 General dhcpd: DHCPINFORM from 10.1.1.182 via eth0
Oct 26 17:23:51 General dhcpd: DHCPACK to 10.1.1.182 (00:19:bb:d3:ec:f1) via eth0