CentOS7でIPを固定する

IPを固定する

/etc/sysconfig/network-scripts/ifcfg-enp3s0

 DEVICE="enp3s0"
 ONBOOT=yes
 NETBOOT=yes
 UUID="0ebc2621-6086-4d9a-a15d-c52cdf6ade01"
 IPV6INIT=no
-BOOTPROTO=dhcp
 HWADDR="08:00:27:bf:e6:ec"
 TYPE=Ethernet
 NAME="enp3s0"

+BOOTPROTO=static
+DNS1="8.8.8.8"
+DNS2="8.8.4.4"
+DOMAIN=mydomain.com
+IPADDR=192.168.100.11
+NETMASK=255.255.255.0
+GATEWAY=192.168.100.1

IPを自動取得する場合

/etc/sysconfig/network-scripts/ifcfg-enp3s0

 DEVICE="enp3s0"
 ONBOOT=yes
 NETBOOT=yes
 UUID="0ebc2621-6086-4d9a-a15d-c52cdf6ade01"
 IPV6INIT=no
 BOOTPROTO=dhcp
 HWADDR="08:00:27:bf:e6:ec"
 TYPE=Ethernet
 NAME="enp3s0"
+DNS1="8.8.8.8"
+DNS2="8.8.4.4"

IPを固定しつつ自動取得もする

• BOOTPROTO=dhcpがミソ

/etc/sysconfig/network-scripts/ifcfg-enp3s0

 DEVICE="enp3s0"
 ONBOOT=yes
 NETBOOT=yes
 UUID="0ebc2621-6086-4d9a-a15d-c52cdf6ade01"
 IPV6INIT=no
 BOOTPROTO=dhcp
 HWADDR="08:00:27:bf:e6:ec"
 TYPE=Ethernet
 NAME="enp3s0"

+DNS1="8.8.8.8"
+DNS2="8.8.4.4"
+DOMAIN=mydomain.com
+IPADDR=192.168.100.11
+NETMASK=255.255.255.0
+GATEWAY=192.168.100.1

/etc/sysconfig/network

NETWORKING="yes"
GATEWAYDEV="enp3s0"
NETWORKING_IPV6="no"
IPV6_DEFAULTDEV="enp3s0"
GATEWAY=192.168.100.1

/etc/hostname

dell.mydomain.com

設定反映

systemctl daemon-reload
systemctl restart network

IPv6を無効

• How do i disable IPv6 on CentOS 7

/etc/sysctl.d/98-disableipv6.conf

net.ipv6.conf.all.disable_ipv6 = 1

/etc/sysconfig/network-scripts/ifcfg-enp3s0

- IPV6INIT=yes
+ IPV6INIT=no

reboot

確認

sysctl -a | grep disable_ipv6