跳到主要内容

Networking in Linux

Network Card​

  • modify the default network card name starting from eth0
sed -Ei 's/^(GRUB_CMDLINE_LINUX=".*)"/\1 net.ifnames=0"/' /etc/default/grub

grub2-mkconfig -o /boot/grub2/grub.cfg || grub-mkconfig -o /boot/grub/grub.cfg
reboot

Network Service​

  • view the system's default network service
systemctl list-units --type=service | grep -P "NetworkManager|networkd|networking"
NetworkManager.service
# yum install -y NetworkManager || yum install -y network-manager
# sed -i '/^\[ifupdown\]/,/^\[/{s/^managed=.*/managed=true/}' /etc/NetworkManager/NetworkManager.conf
nmcli con add type ethernet ifname eth0 con-name con-eth0 ip4 10.0.0.100/24 gw4 10.0.0.254 ipv4.dns 223.5.5.5
nmci con mod con-eth0 +ipv4.routes "20.0.0.0/24 10.0.0.254"
nmcli con up con-eth0
systemd-networkd.service
cat > "/etc/netplan/00-eth0.conf" << EOF
network:
  ethernets:
    eth0:
      addresses:
        - "10.0.0.1/24"
      routes:
        - to: default
          via: 10.0.0.254
      nameservers:
        search: [blog.hsieh.top] 
        addresses: [223.5.5.5,223.6.6.6]  
EOF

netplan apply
networking.service
# apt install -y ifupdown resolvconf
ifdown ens33
cat > "/etc/network/interfaces.d/eth0.cfg" <<EOF
auto eth0
# iface eth0 inet auto
iface eth0 inet static
  address 10.0.0.100
  netmask 255.255.255.0
  gateway 10.0.0.254
  dns-nameservers 223.5.5.5
EOF
ifup eth0
echo 'nameserver 223.5.5.5' >> /etc/resolve.conf

Bond​

nmcli dev
nmcli con add type bond ifname bond0 con-name con-bond0 mode active-backup ip4 10.0.0.100/24 gw4 10.0.0.254
nmcli con add type bond-slave  ifname eth1 con-name bond0-slave-eth1 master bond0
nmcli con add type bond-slave  ifname eth2 con-name bond0-slave-eth1 master bond0
nmcli con reload

Bridge​

# yum install -y bridge-utils
brctl addbr br0
brctl addif br0 eth1
brctl show