/etc/network/interfaces

address 192.168.10.x
network 192.168.10.0
netmask 255.255.255.0
broadcast 192.168.10.255
gateway 192.168.10.254

192.168.20.x
network 192.168.20.0
netmask 255.255.255.0
broadcast 192.168.20.255
gateway 192.168.20.254

192.168.21.x
network 192.168.21.0
netmask 255.255.255.0
broadcast 192.168.21.255
gateway 192.168.21.254

apagar la interfaz
ifdown enp0s3

encender la interfaz
ifup enp0s3

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Apache2
/var/www/html

VirtualHost
/etc/apache2/sites-available/

---   ---   ---   ---   ---
apt install proftpd
/etc/proftpd/proftpd.conf
UseIPv6 off
DefaultRoot ~

reiniciar el demonio
systemctl restart proftpd

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UserDir
sudo a2enmod userdir

Editar el archivo de configuración de userdir
/etc/apache2/mods-enabled/userdir.conf
En la línea 7 agregar
AllowOverride All

comentar las ultimas 5 líneas con #
/etc/apache2/mods-enabled/php7.4.conf

reiniciar el apache2
systemctl restart apache2

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MySQL
apt install gnupg
cd /tmp 
wget https://repo.mysql.com/mysql-apt-config_0.8.33-1_all.deb
sudo dpkg -i mysql-apt-config* 
apt install default-mysql-server

otorgar todos los permisos al usuario phpmyadmin
mysql -u root -p
use mysql;
GRANT ALL PRIVILEGES ON *.* TO 'phpmyadmin'@'localhost' IDENTIFIED BY 'debian' WITH GRANT OPTION;
FLUSH PRIVILEGES;
EXIT;

apt install phpmyadmin
apt remove phpmyadmin
apt purge phpmyadmin
apt clean phpmyadmin

DHCP
apt install isc-dhcp-server
/etc/default/isc-dhcp-server
INTERFACESV4="enp0s8"


/etc/dhcp/dhcpd.conf
dns-update-style none;
option domain-name "fimaz.net";
option domain-name-servers 192.168.1.100, 192.168.1.1;
default-lease-time 600;
max-lease-time 7200;
authoritative;

## SubNet fimaz.net
subnet 192.168.1.0 netmask 255.255.255.0 {
  range 192.168.1.32 192.168.1.63;
  option routers 192.168.1.254;
  option broadcast-address 192.168.1.255;
}

## Asignacion de direccionamiento ip estatico
host desktop {
  hardware ethernet 00:00:00:00:00:11;
  fixed-address 192.168.1.2;
}


IPTables
cd /etc
mkdir iptables
cd iptables

nano iptables.sh
#!/bin/sh
iptables="/sbin/iptables"
/sbin/modprobe ip_tables
/sbin/modprobe iptable_nat
/sbin/modprobe ip_conntrack_ftp
/sbin/modprobe ip_nat_ftp
/sbin/modprobe ipt_REDIRECT
/sbin/modprobe ip_conntrack
/sbin/modprobe iptable_filter
/sbin/modprobe ipt_MASQUERADE
echo "Refrescando las reglas"
/sbin/iptables -F
/sbin/iptables -F -t nat
/sbin/iptables -A FORWARD -j ACCEPT
echo "1" > /proc/sys/net/ipv4/ip_forward
echo "1" >/proc/sys/net/ipv4/tcp_syncookies
/sbin/iptables -t nat -A POSTROUTING -s 192.168.1.0/255.255.255.0 -d 0/0 -o enp0s3 -j MASQUERADE

bash iptables.sh

CronTab
nano /etc/crontab
al final del archivo agregar lo siguiente
* *     * * *   root    bash /etc/iptables/iptables.sh
hacer pruebas de comunicacion hacia el internet publico de alguna pc cliente dentro del dhcp