Désactivation IPv6 :
    net.ipv6.conf.all.disable_ipv6 = 1
    net.ipv6.conf.default.disable_ipv6 = 1
    net.ipv6.conf.lo.disable_ipv6 = 1

==> VOIR script désactive_ipv6.sh



SUR CentOS 7 / Red Hat 7 :

 systemctl disable NetworkManager
 systemctl stop NetworkManager

 ONBOOT="yes"   #  dans fichier /etc/sysconfig/network-scripts/ifcfg-<NIC>

 reboot



POUR CHARGER INCONDITIONNELLEMENT UN MODULE [AVEC PARAMÈTRE(S)] AU LANCEMENT DE LINUX :

# cat /etc/modules-load.d/bond.conf
bonding

# cat /etc/modprobe.d/bond.conf
options bonding mode=802.3ad miimon=100 updelay=100 lacp_rate=fast




SI besoin de générer des adresses MAC :

openssl rand -hex 6 | sed 's/\(..\)/\1:/g; s/.$//'

  OU

GetMAC () 
{ 
    if [ -n "$1" ]; then
        echo -n "$1" | tr A-Z a-z | md5sum | sed 's/^\(..\)\(..\)\(..\)\(..\)\(..\).*$/02:\1:\2:\3:\4:\5/' | tr a-z A-Z;
    else
        echo "ERROR: please supply hostname to create MAC address from, e.g.:";
        echo "       $FUNCNAME myhost";
    fi
}

EXEMPLE # GetMAC truc
02:45:72:3A:2A:F3

EXEMPLE CHANGEMENT SUR "VRAIE" CARTE RÉSEAU :

ip link set enx74dadaf4a322 down                         
ip link set dev enx74dadaf4a322 address 02:45:72:3A:2A:F3
ip link set enx74dadaf4a322 up                           




Using ip, what does LOWER_UP mean? (https://stackoverflow.com/questions/36715664/using-ip-what-does-lower-up-mean  et aussi  https://unix.stackexchange.com/questions/153136/ip-addr-command-shows-up-even-there-is-no-address-associated-with-that-inter)
    LOWER_UP is a physical layer link flag (the layer below the network layer, where IP is generally located). LOWER_UP indicates that an Ethernet cable was plugged in and that the device is connected to the network.
    LOWER_UP differs from UP, which additionally requires the network interface to be enabled.





UTILISATION AVANCÉE DE tcpdump : https://www.wains.be/pub/networking/tcpdump_advanced_filters.txt