Initial Settings : Network Settings2023/02/20 |
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If you did not configure networking during the CentOS Stream installation, Configure it like follows.
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| [1] | To set static IP address to the server, Modify settings like follows. ( Replace the interface name [enp1s0] to your own one because it's not the same on any System ) |
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# if you did not set HostName, set it like follows [root@localhost ~]# hostnamectl set-hostname dlp.srv.world
# display devices [root@localhost ~]# nmcli device DEVICE TYPE STATE CONNECTION enp1s0 ethernet connected enp1s0 lo loopback unmanaged -- # set IPv4 address [root@localhost ~]# nmcli connection modify enp1s0 ipv4.addresses 10.0.0.30/24 # set gateway [root@localhost ~]# nmcli connection modify enp1s0 ipv4.gateway 10.0.0.1 # set DNS # for multiple DNS, specify with space separated ⇒ ipv4.dns "10.0.0.10 10.0.0.11 10.0.0.12" [root@localhost ~]# nmcli connection modify enp1s0 ipv4.dns 10.0.0.10 # set DNS search base (your domain name -for multiple one, specify with space separated) [root@localhost ~]# nmcli connection modify enp1s0 ipv4.dns-search srv.world # set [manual] for static setting (it's [auto] for DHCP) [root@localhost ~]# nmcli connection modify enp1s0 ipv4.method manual # restart the interface to reload settings [root@localhost ~]# nmcli connection down enp1s0; nmcli connection up enp1s0 Connection 'enp1s0' successfully deactivated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/1) Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/2) # confirm settings [root@localhost ~]# nmcli device show enp1s0 GENERAL.DEVICE: enp1s0 GENERAL.TYPE: ethernet GENERAL.HWADDR: 52:54:00:DF:87:AD GENERAL.MTU: 1500 GENERAL.STATE: 100 (connected) GENERAL.CONNECTION: enp1s0 GENERAL.CON-PATH: /org/freedesktop/NetworkManager/ActiveC> WIRED-PROPERTIES.CARRIER: on IP4.ADDRESS[1]: 10.0.0.30/24 IP4.GATEWAY: 10.0.0.1 IP4.ROUTE[1]: dst = 10.0.0.0/24, nh = 0.0.0.0, mt = 1> IP4.ROUTE[2]: dst = 0.0.0.0/0, nh = 10.0.0.1, mt = 100 IP4.DNS[1]: 10.0.0.10 IP4.SEARCHES[1]: srv.world IP6.ADDRESS[1]: fe80::5054:ff:fedf:87ad/64 IP6.GATEWAY: -- IP6.ROUTE[1]: dst = fe80::/64, nh = ::, mt = 100 # confirm state [root@localhost ~]# ip address show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 52:54:00:df:87:ad brd ff:ff:ff:ff:ff:ff
inet 10.0.0.30/24 brd 10.0.0.255 scope global noprefixroute enp1s0
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fedf:87ad/64 scope link noprefixroute
valid_lft forever preferred_lft forever
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| [2] | If you don't need IPv6, it's possible to disable it like follows. |
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# disable IPv6 [root@localhost ~]# grubby --update-kernel ALL --args ipv6.disable=1 # verify kernel parameters [root@localhost ~]# grubby --info DEFAULT index=0 kernel="/boot/vmlinuz-5.14.0-17.el9.x86_64" args="ro crashkernel=1G-4G:192M,4G-64G:256M,64G-:512M resume=/dev/mapper/cs-swap rd.lvm.lv=cs/root rd.lvm.lv=cs/swap console=ttyS0,115200n8 selinux=0 ipv6.disable=1" root="/dev/mapper/cs-root" initrd="/boot/initramfs-5.14.0-17.el9.x86_64.img" title="CentOS Stream (5.14.0-17.el9.x86_64) 9" id="ab414d4792d04b9dbc1e2361f936e849-5.14.0-17.el9.x86_64"
[root@localhost ~]#
[root@localhost ~]# ip address show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 52:54:00:df:87:ad brd ff:ff:ff:ff:ff:ff
inet 10.0.0.30/24 brd 10.0.0.255 scope global noprefixroute enp1s0
valid_lft forever preferred_lft forever
# if falling back to enable, run like follows [root@localhost ~]# grubby --update-kernel ALL --remove-args ipv6.disable |
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