Rocky Linux 8 のIPアドレス変更

# 権限昇格
sudo su

# 現状確認
nmcli connection show
ip route show default

# 変更
nmcli connection modify "System eth0" ipv4.gateway 10.20.0.254
nmcli connection modify "System eth0" ipv4.dns "10.20.0.254"
nmcli connection up "System eth0"

# 動作確認
ip route show default
ping 8.8.8.8
ping google.com