Centos project instance 2-DHCP Configuration

1. DHCP configuration on zzsrv1 1.1. Installation

# mkdir /mnt/cdrom/# mount /dev/cdrom  /mnt/cdrom# cd /mnt/cdrom/Packages/# ls dhcp*dhcp-4.2.5-27.el7.centos.x86_64.rpm  dhcp-common-4.2.5-27.el7.centos.x86_64.rpm  dhcp-libs-4.2.5-27.el7.centos.x86_64.rpm# rpm -Uvh dhcp-4.2.5-27.el7.centos.x86_64.rpmPreparing...                          ################################# [100%]Updating / installing...   1:dhcp-12:4.2.5-27.el7.centos      ################################# [100%]

1.2. Configuration

# Rpm-qc dhcp/etc/DHCP/DHCPD. conf/etc/DHCP/dhcpd6.conf/etc/OpenLDAP/Schema/DHCP. schema/etc/sysconfig/DHCPD/var/lib/DHCPD. leases/var/lib/DHCPD/dhcpd6.leases # cd/etc/DHCP/# cp DHCPD. conf DHCPD. conf. origin # Cat/etc/DHCP/DHCPD. conf ## DHCP server configuration file. # See/usr/share/doc/DHCP */DHCPD. conf. example # See DHCPD. conf (5) man page # view the sample file # vi/usr/share/doc/dhcp-4.2.5/DHCPD. conf. example

The IP address lease of vlan1 is three days, and the IP address lease of vlan2 is eight days.

[[email protected] dhcp]# echo  3*24*60*60 | bc259200[[email protected] dhcp]# echo  8*24*60*60 | bc691200

Background:

Default-lease-time; Time shoshould be the length in seconds that will be assigned to a lease if the client requesting the lease does not ask for a specific expiration time. this is used for both dhcpv4 and dhcpv6 leases (it is also known as the "valid lifetime" in dhcpv6 ). the default is 43200 seconds. Max-lease-time; Time shocould be the maximum length in seconds that will be assigned to a lease. if not defined, the default maximum lease time is 86400. the only exception to this is that dynamic BOOTP lease lengths, which are not specified by the client, are not limited by this maximum.

# Vi/etc/DHCP/DHCPD. conf

Option domain-name "bigcloud. Local "; Option domain-name-servers 192.168.188.11, 192.168.188.12; Default-lease-time 691200; Max-lease-time 691200; Subnet 192.168.188.0 netmask 255.255.255.0 { Range 192.168.188.100 192.168.188.159; Range 192.168.188.170 192.168.188.253; Default-lease-time 259200; Max-lease-time 259200; Option routers 192.168.188.2; } Subnet 192.168.189.0 netmask 255.255.255.0 { Range 192.168.189.100 192.168.189.253; Option routers 192.168.189.2; } Host printer1 { Hardware Ethernet 00: 12: 34: 56: 78: 90; Fixed-address 192.168.188.111; }

Start the service

# Service DHCPD start

Redirecting to/bin/systemctl start DHCPD. Service

View logs

Internet Systems Consortium DHCP server 4.2.5 Copyright 2004-2013 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ Not searching LDAP since LDAP-server, LDAP-port and LDAP-base-DN were not specified in the config file Wrote 0 deleted host decls to leases file. Wrote 0 New Dynamic Host decls to leases file. Wrote 0 leases to leases file. Listening on LPF/eno16777728/00: 0C: 29: A4: 2E: 39/192. 168.188.0/24 Sending on LPF/eno16777728/00: 0C: 29: A4: 2E: 39/192. 168.188.0/24 Sending on socket/fallback-Net

Configure DHCPD to auto start, which is a new change on centos 7

# chkconfig dhcpd onNote: Forwarding request to ‘systemctl enable dhcpd.service‘.ln -s ‘/usr/lib/systemd/system/dhcpd.service‘ ‘/etc/systemd/system/multi-user.target.wants/dhcpd.service‘# systemctl enable dhcpd# systemctl is-enabled dhcpdenabled

1.3. Test

Test on a Windows Client

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When the client rents an IP address, it will see in the log

Dhcpinform from 192.168.188.100 via eno16777728: not authoritative for subnet 192.168.188.0 Dhcprequest for 192.168.188.100 from 00: 0C: 29: B3: A2: 60 (tomsrv1) via eno16777728 Dhcpack on 192.168.188.100 to 00: 0C: 29: B3: A2: 60 (tomsrv1) via eno16777728 Dhcprequest for 192.168.188.100 from 00: 0C: 29: B3: A2: 60 (tomsrv1) via eno16777728 Dhcpack on 192.168.188.100 to 00: 0C: 29: B3: A2: 60 (tomsrv1) via eno16777728 Dhcprequest for 192.168.188.100 from 00: 0C: 29: B3: A2: 60 (tomsrv1) via eno16777728 Dhcpack on 192.168.188.100 to 00: 0C: 29: B3: A2: 60 (tomsrv1) via eno16777728

# Tail/var/lib/DHCPD. Leases

This article from the "Liu Qiong @ Tiandao reward diligence" blog, please be sure to keep this source http://lqiong.blog.51cto.com/8170814/1559058

Centos project instance 2-DHCP Configuration