我需要一些build议，如果可能的话，关于DHCP服务器和IP地址保留。
该系统是一个Ubuntu服务器12.04 LTS。 DHCP是ISC DHCPd版本4.1。
这是/etc/dhcp/dhcpd.conf文件：
ddns-update-style interim; log-facility local7; subnet 100.1.1.0 netmask 255.255.255.0 { option ntp-servers ntp1.inrim.it; authoritative; option domain-name-servers 100.1.1.120 , 100.1.1.130; option domain-name "domain.local"; option subnet-mask 255.255.255.0; option routers 100.1.1.120; max-lease-time 7200; default-lease-time 600; range 100.1.1.150 100.1.1.170; # NEXUS_5 host android-72c7a71611f38b65 { hardware ethernet CC:FA:00:E8:7E:37; fixed-address 100.1.1.250; } } 这是当我的连接到局域网并获得一个IP地址的系统日志：
Jun 19 17:50:22 gate dhcpd: Unable to add forward map from android-72c7a71611f38b65.jodovit.local to 100.1.1.162: timed out Jun 19 17:50:22 gate dhcpd: DHCPREQUEST for 100.1.1.162 from cc:fa:00:e8:7e:37 (android-72c7a71611f38b65) via eth1 Jun 19 17:50:22 gate dhcpd: DHCPACK on 100.1.1.162 to cc:fa:00:e8:7e:37 (android-72c7a71611f38b65) via eth1
正如你所看到的..我的连接采取IP 100.1.1.162而不是100.1.1.250在configuration文件中…
有人能解释我更好的锄头预订工作吗？
谢谢你，我的英语对不起
卢卡
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在@Andrewbuild议之后，我将主机声明移到子网声明之外。 重新启动服务，并尝试连接我的Nexus，但IP是从DHCP池而不是从预留IP。
dhcpdump的结果是：
TIME: 2014-06-20 08:31:40.706 IP: 0.0.0.0 (cc:fa:0:e8:7e:37) > 255.255.255.255 (ff:ff:ff:ff:ff:ff) OP: 1 (BOOTPREQUEST) HTYPE: 1 (Ethernet) HLEN: 6 HOPS: 0 XID: 09ae4197 SECS: 0 FLAGS: 0 CIADDR: 0.0.0.0 YIADDR: 0.0.0.0 SIADDR: 0.0.0.0 GIADDR: 0.0.0.0 CHADDR: cc:fa:00:e8:7e:37:00:00:00:00:00:00:00:00:00:00 SNAME: . FNAME: . OPTION: 53 ( 1) DHCP message type 3 (DHCPREQUEST) OPTION: 61 ( 7) Client-identifier 01:cc:fa:00:e8:7e:37 OPTION: 50 ( 4) Request IP address 100.1.1.162 OPTION: 57 ( 2) Maximum DHCP message size 1500 OPTION: 60 ( 12) Vendor class identifier dhcpcd-5.5.6 OPTION: 12 ( 24) Host name android-72c7a71611f38b65 OPTION: 55 ( 10) Parameter Request List 1 (Subnet mask) 33 (Static route) 3 (Routers) 6 (DNS server) 15 (Domainname) 26 (Interface MTU) 28 (Broadcast address) 51 (IP address leasetime) 58 (T1) 59 (T2) --------------------------------------------------------------------------- TIME: 2014-06-20 08:31:40.710 IP: 100.1.1.120 (0:50:56:a5:eb:ed) > 100.1.1.162 (cc:fa:0:e8:7e:37) OP: 2 (BOOTPREPLY) HTYPE: 1 (Ethernet) HLEN: 6 HOPS: 0 XID: 09ae4197 SECS: 0 FLAGS: 0 CIADDR: 0.0.0.0 YIADDR: 100.1.1.162 SIADDR: 100.1.1.120 GIADDR: 0.0.0.0 CHADDR: cc:fa:00:e8:7e:37:00:00:00:00:00:00:00:00:00:00 SNAME: . FNAME: . OPTION: 53 ( 1) DHCP message type 5 (DHCPACK) OPTION: 54 ( 4) Server identifier 100.1.1.120 OPTION: 51 ( 4) IP address leasetime 600 (10m) OPTION: 1 ( 4) Subnet mask 255.255.255.0 OPTION: 3 ( 4) Routers 100.1.1.120 OPTION: 6 ( 8) DNS server 100.1.1.120,100.1.1.130 OPTION: 15 ( 13) Domainname jodovit.local OPTION: 58 ( 4) T1 300 (5m) OPTION: 59 ( 4) T2 525 (8m45s) ---------------------------------------------------------------------------
我认为这可能是一个范围界定问题。 我build议移动host声明以外的subnet声明。
DHCPD将首先查找host声明，然后根据分配的固定IP地址确定主机所属的哪个子网。
如果你想跟踪DHCP对话， dhcpdump包是非常有用的。
例：
ddns-update-style interim; log-facility local7; subnet 100.1.1.0 netmask 255.255.255.0 { option ntp-servers ntp1.inrim.it; authoritative; [... snip ...] range 100.1.1.150 100.1.1.170; } host android-72c7a71611f38b65 { hardware ethernet CC:FA:00:E8:7E:37; fixed-address 100.1.1.250; }