Linux
/var/log/messages 中的 DHCP 請求過多:DHCPINFORM、DHCPACK 和 DHCPREQUEST 重複
我有一個為多個子網執行 DHCP 的 CentOS 5 系統。在 /var/log/messages 中,我看到不斷的 DHCPINFORM、DHCPACK 和 DHCPREQUEST 消息。我不明白為什麼這些請求在這裡比在其他安裝中更頻繁。消息每隔幾秒就會爆發一次,導致日誌文件非常大。
這裡的大部分設備是無線手持設備(使用 Windows CE TCP 堆棧)。對於平息不斷的消息,我將不勝感激。
/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/日誌/消息
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
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我已經
ip helper-address
從一些 DHCP 伺服器端路由器中刪除了一些無關的條目。大部分流量已經消退,但是我仍然收到很多 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
看起來您的客戶端連接到多個子網(或將 dhcp 幫助程序相互中繼的路由器)。由於我不了解您的拓撲結構,因此我不能肯定地說。
需要檢查的幾件事:
- 所有客戶都會出現這種情況嗎?或者只是位於特定網段的那些?
- 這些客戶端是否連接到多個子網?
- 您是否已確認子網之間沒有橋接?
您應該查看您的每個客戶端,可能使用 ethreal,並確定它們是否從多個路由器接收多個 DHCPACK(它們可能是)。