DHCP——分配固定IP地址

小半 • 2023年1月12日下午8:41 • 操作系统 • 阅读 483

一、通过DHCP服务器租约文件查看具体租约

从这里可以获取网卡的Mac地址。

[root@DHCP ~]# cat /var/lib/dhcpd/dhcpd.leases
# The format of this file is documented in the dhcpd.leases(5) manual page.
# This lease file was written by isc-dhcp-4.3.6

# authoring-byte-order entry is generated, DO NOT DELETE
authoring-byte-order little-endian;

server-duid "\000\001\000\001**\343\350\000\014)u\037\310";

lease 192.168.9.145 {
  starts 4 2022/06/02 06:11:09; // 租约开始时间
  ends 4 2022/06/02 08:11:09;   // 租约结束时间
  cltt 4 2022/06/02 06:11:09;
  binding state active;
  next binding state free;
  rewind binding state free;
  hardware ethernet 00:0c:29:8e:d3:14; // Mac地址
  client-hostname "Oracle19c"; // 主机名
}
lease 192.168.9.146 {
  starts 4 2022/06/02 06:12:28;
  ends 4 2022/06/02 08:12:28;
  cltt 4 2022/06/02 06:12:28;
  binding state active;
  next binding state free;
  rewind binding state free;
  hardware ethernet 00:0c:29:8e:d3:1e;
}

注：当你发现这里的时间和你的服务器时间不一致的时候，建议你修改时区解决问题，一般是差8个小时。

二、修改DHCP配置文件

[root@DHCP ~]# vim /etc/dhcp/dhcpd.conf
host fantasia {  // 主机名称，可自定义
  hardware ethernet 00:0c:29:8e:d3:1e; // 需要分配客户端的Mac地址 
  fixed-address 192.168.9.150; // 需要分配的固定ip
}

[root@DHCP ~]# systemctl restart dhcpd

三、客户端测试

[root@Oracle19c ~]# dhclient -r ens34
[root@Oracle19c ~]# ifconfig ens34

[root@Oracle19c ~]# dhclient -d ens34
Internet Systems Consortium DHCP Client 4.2.5
Copyright 2004-2013 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/ens34/00:0c:29:8e:d3:1e
Sending on   LPF/ens34/00:0c:29:8e:d3:1e
Sending on   Socket/fallback
DHCPDISCOVER on ens34 to 255.255.255.255 port 67 interval 6 (xid=0x59f82759)
DHCPREQUEST on ens34 to 255.255.255.255 port 67 (xid=0x59f82759)
DHCPOFFER from 192.168.9.132
DHCPACK from 192.168.9.132 (xid=0x59f82759)
bound to 192.168.9.150 -- renewal in 3323 seconds.
^C

[root@Oracle19c ~]# ifconfig ens34

测试成功，获取ip150：