Network

https://qiita.com/liqsuq/items/1474702cb01c9cc9e781
https://endy-tech.hatenablog.jp/entry/2018/09/08/140950
https://endy-tech.hatenablog.jp/entry/2019/01/14/012743
https://densan-hoshigumi.com/server/centos-nmcli-operation

systemctl start NetworkManager
systemctl stop NetworkManager
systemctl restart NetworkManager
systemctl status NetworkManager

nmcli networking off
nmcli networking on

nmcli gen

nmcli dev
nmcli dev show ens192

nmcli con show ens192

## Address
nmcli con mod ens192 ipv4.method manual ipv4.addresses 192.168.100.123/24
#nmcli con mod ens192 ipv4.method auto -ipv4.addresses 192.168.100.123/24
#nmcli con mod ens192 +ipv4.addresses 192.168.100.124/24
#nmcli con mod ens192 -ipv4.addresses 192.168.100.124/24

## Gateway
nmcli con mod ens192 ipv4.gateway 192.168.100.1
#nmcli con mod ens192 ipv4.gateway 0.0.0.0

## DNS
#nmcli con mod ens192 ipv4.dns 8.8.8.8
#nmcli con mod ens192 +ipv4.dns 8.8.4.4
#nmcli con mod ens192 -ipv4.dns 8.8.8.8 -ipv4.dns 8.8.4.4

## Auto Connect
nmcli con mod ens192 connection.autoconnect yes

nmcli con reload
nmcli con down ens192 && nmcli con up ens192

## Additional NIC for NAT
nmcli con mod "Wired connection 1" connection.id ens34
nmcli con mod ens34 connection.autoconnect yes

nmcli con reload
nmcli con down ens34 && nmcli con up ens34

https://access.redhat.com/sites/default/files/attachments/rh_ip_command_cheatsheet_1214_jcs_print_ja4.pdf

ip addr
ip route
ss

ifconfig -a
route -n
arp
netstat

ifconfig ens192 192.168.100.123 netmask 255.255.255.0 broadcast 192.168.100.255
ifconfig ens192 down && ifconfig ens192 up

systemctl start firewalld
systemctl stop firewalld
systemctl restart firewalld
systemctl status firewalld

systemctl enable firewalld
systemctl disable firewalld

firewall-cmd --list-service

https://qiita.com/legitwhiz/items/2e7c975ae1bbe4da911a

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