Create VLANs in Linux
ip link add link eth0 name eth0.3001 type vlan id 3001
ip addr add 192.168.100.1/24 brd 192.168.100.255 dev eth0.3001
ip link set dev eth0.3001 up
ip -d addr show
Reference: https://www.baeldung.com/linux/vlans-create
Login as Root in Ubuntu GUI
GDM – GNOME Display Manager
/etc/pam.d/gdm-autologin
/etc/pam.d/gdm-password
註解掉 # auth required pam_succeed_if.so user != root quiet_success
sudo service gdm restart
How to connect hidden ssid on debian 11
root@LINUX:~# rfkill unblock wifi
root@LINUX:~# killall wpa_supplicant
root@LINUX:~# wpa_passphrase SSID-NAME Password > wpa.conf
root@LINUX:~# wpa_supplicant -i wlan0 -c wpa.conf -B
root@LINUX:~# dhclient wlan0
changed its 'Version' value from '11.5' to '11.8'
N: Repository 'http://opensource.nchc.org.tw/debian bullseye InRelease' changed its 'Version' value from '11.5' to '11.8'
root@LINUX:~/tmp# apt-get update --allow-releaseinfo-change
Change root password using sed
1. Generate new root password & Su2Root
# openssl passwd -1 -salt root hello123
2. Replace first line in shadow file
# sed -i '1c root:$1$root$wrNKG1lgeNwlb0I1oJbR9/.:19613:0:99999:7:::' /etc/shadow
Using UserAccountControl Flags to Manipulate Properties (LDAP, AD)
userAccountControl == 66048 (512+65536)
userAccountControl == 66050 Disabled, Don’t Expire Password
userAccountControl == 514 (512+2) Account Disable
Reference: https://shellgeek.com/useraccountcontrol-flags-to-manipulate-properties/#UserAccountControl_66050_Disabled_and_Dont_Expire_Password
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