Cài đặt mạng network trên LINUX

1 số lệnh show

+ Kiểm tra trạng thái mạng:

# systemctl status NetworkManager

# ip link

# ip addr show dev ens3

+ display devices:  # nmcli d

+ show settings: # nmcli d show eth0

+ show status:

# ip addr show

# ip a

Cấu hình mạng CentOS

+ ls /etc/sysconfig/network-scripts/

+ vi /etc/sysconfig/network-scripts/ifcfg-enp0s3

•  sửa:

BOOTPROTO=static
ONBOOT=yes

• Thêm cấu hình dưới BOOTPROTO=static:

IPADDR=192.168.18.100
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
DNS1=210.245.31.220
DNS2=115.84.181.20

+ # systemctl restart network.service (rocky linux thì # reboot)

Disable IPv6 CentOS 7, Rocky Linux 8

+ Sửa file: # vi /etc/default/grub
line 6 add: ipv6.disable=1
GRUB_CMDLINE_LINUX=”ipv6.disable=1 rd.lvm.lv=fedora-server/root…..
+ apply changing
# grub2-mkconfig -o /boot/grub2/grub.cfg
# reboot

+ enable lại IPv6 thì sửa ipv6.disable=0

Disable IPv6 CentOS Stream 8

# disable IPv6
[root@thanhdd ~]# grubby –update-kernel ALL –args ipv6.disable=1
# verify kernel parameters
[root@thanhdd ~]# grubby –info DEFAULT
[root@thanhdd ~]# reboot
# if falling back to enable, run like follows
[root@thanhdd ~]# grubby –update-kernel ALL –remove-args ipv6.disable

Network Settings Unbutu

+ Xem tên file cấu hình network: # ls /etc/netplan

+ # sudo vi /etc/netplan/01-netcfg.yaml
+ sửa file (thò thụt đầu dòng đúng):

network:
  version: 2
  renderer: networkd
  ethernets:
    ens3:
      dhcp4: no
      # IP address/subnet mask
      addresses: [10.0.0.30/24]
      # default gateway
      gateway4: 10.0.0.1
      nameservers:
        # name server this host refers
        addresses: [10.0.0.10,10.0.0.11]
      dhcp6: no

+ apply settings: # sudo netplan apply

Disable IPv6 Unbutu

+ # sudo vi /etc/sysctl.conf

+ Thêm dòng này vào file: net.ipv6.conf.all.disable_ipv6 = 1

+ # sysctl -p

+ Enable IPv6 lại thì đổi net.ipv6.conf.all.disable_ipv6 = 0