== Clean the console and output to serial ==
Into **/etc/inittab**:

Comment:
  # TERMINALS
  #x1:12345:respawn:/sbin/agetty 38400 console linux
  #c1:12345:respawn:/sbin/agetty 38400 tty1 linux
  #c2:2345:respawn:/sbin/agetty 38400 tty2 linux
  #c3:2345:respawn:/sbin/agetty 38400 tty3 linux
  #c4:2345:respawn:/sbin/agetty 38400 tty4 linux
  #c5:2345:respawn:/sbin/agetty 38400 tty5 linux
  #c6:2345:respawn:/sbin/agetty 38400 tty6 linux

And set:
  s0:12345:respawn:/sbin/agetty -L 115200 ttymxc0 linux
  
== Other files ==
  * Set the correct entry into **/etc/fstab** with /dev/mmcblk0pX in case of uSD
  * Set your password into **/etc/shadow**
  * Add your ssh key
  * /etc/ssh/sshd_config put:
    * Banner none
    * AllowUsers root
    * #AcceptEnv LANG LC_*
    * AllowAgentForwarding no
    * AllowTcpForwarding no
    * GatewayPorts no
    * X11Forwarding no
    * PermitRootLogin yes
    * StrictModes yes
    * RhostsRSAAuthentication no
    * HostbasedAuthentication no
    * AuthorizedKeysFile      .ssh/authorized_keys
  * Edit and set your network configuration
  * /etc/resolv.conf
  nameserver 8.8.8.8
  options timeout:1

  * Into **/etc/portage/make.conf** put:

  CHOST="armv7a-hardfloat-linux-gnueabi"
  CFLAGS="-O2 -pipe -mfpu=vfpv4 -mfloat-abi=hard -march=native -mtune=native"
  CXXFLAGS="${CFLAGS}"
  MAKEOPTS="-j2"
  PORTAGE_IONICE_COMMAND="ionice -c 3 -p \${PID}"
  PORTAGE_NICENESS="19"
  FEATURES="parallel-fetch sandbox fail-clean noman noinfo nodoc"
  PORTAGE_RSYNC_EXTRA_OPTS="-z --compress-level=9 -4 --exclude=/metadata/md5-cache --
  exclude=/metadata/cache"
  LC_MESSAGES=C
  
  CURL_SSL="openssl"
  PYTHON_SINGLE_TARGET="python2_7"
  PYTHON_TARGETS="python3_4 python2_7"
  U_DEVICES="custom-cflags custom-cxxflags"
  U_SYSTEM="ipv6 hardened glibc-omitfp cxx minimal nptl zlib threads lzma xz xtpax xattr openrc inotify openmp"
  USE="-* ${U_DEVICES} ${U_SYSTEM}"
  INPUT_DEVICES="keyboard"
  PAX_MARKINGS="XT"

  * echo 'en_US.UTF-8 UTF-8' > /etc/locale.gen
  * Content of **/etc/portage/package.use**:

  app-editors/nano -minimal
  app-shells/bash readline
  dev-lang/python xml ssl
  net-analyzer/wireshark netlink pcap
  net-dns/dnsmasq -dhcp -id -inotify
  net-misc/wget ipv6 zlib ssl
  sys-apps/openrc netifrc
  sys-apps/net-tools arp hostname
  sys-apps/iproute2 -minimal
  sys-apps/kmod tools
  sys-apps/hwids udev pci net usb
  sys-fs/cryptsetup kernel
  sys-process/procps ncurses
== System packages ==
  * emerge --sync
  * emerge -DaNuv world
  * emerge -av hdparm parted iptables dnsmasq ethtool app-misc/screen gentoolkit u-boot-tools net-analyzer/nmap net-misc/bridge-utils net-misc/dhcp net-misc/dibbler net-misc/iperf net-misc/quagga net-misc/radvd net-misc/telnet-bsd sys-power/cpupower sys-process/vixie-cron net-misc/ntp syslog-ng
  * Set the hostname
  * /etc/conf.d/ip* SAVE_ON_STOP="no"
  * rc-update del keymaps boot;rc-update del netmount;rc-update del termencoding boot
  * rc-update add iptables boot default;rc-update add ip6tables boot default
  * cp /usr/share/zoneinfo/America/La_Paz /etc/localtime

== Firewall ==
{{ :iot-gate-imx7-iptables.txt |}}
{{ :iot-gate-imx7-ip6tables.txt |}}

== /etc/sysctl.conf ==
  net.ipv4.conf.default.rp_filter = 1
  net.ipv4.conf.all.rp_filter = 1
  net.ipv4.tcp_syncookies = 1
  net.ipv4.icmp_echo_ignore_broadcasts = 1
  kernel.panic = 3
  net.ipv6.conf.all.accept_ra=0
  net.ipv4.ip_forward = 1
  net.ipv6.conf.all.autoconf=0
  net.ipv6.conf.default.autoconf=0
  net.ipv6.conf.all.accept_ra_defrtr = 0
  net.ipv6.conf.default.accept_ra_defrtr = 0
  net.ipv6.conf.all.accept_ra = 0
  net.ipv6.conf.default.accept_ra = 0
  net.ipv4.conf.all.accept_source_route=0
  net.ipv4.conf.default.accept_source_route=0
  net.ipv4.conf.all.accept_redirects=0
  net.ipv4.conf.default.accept_redirects=0
  net.ipv4.conf.all.secure_redirects=0
  net.ipv4.conf.default.secure_redirects=0
  
Into the **/etc/fstab**
  none            /tmp                                            tmpfs   defaults,nosuid,size=32M,mode=1777
  none            /var/tmp                                        tmpfs   defaults,nosuid,size=128M,mode=1777
  none            /var/lib/ntp                                    tmpfs   defaults,nosuid,size=32M,mode=755,uid=123,gid=123
  none            /var/spool/cron/lastrun                         tmpfs   defaults,nosuid,size=1M,mode=750
  
== Tweak ==
/etc/local.d/baselayout1.start
  echo -e "\033[9;0]" >/dev/console
  echo 5 > /proc/sys/vm/laptop_mode
  echo 10 > /proc/sys/vm/swappiness
  /usr/bin/cpupower frequency-set -g ondemand