• Rucne zvolit variantu update-alternatives --config iptables
• Revertnout na legacy rezim update-alternatives --set iptables /usr/sbin/iptables-legacy
• Zrusit revert a pouzit Debian default update-alternatives --auto iptables

Nainstalujeme modul xt_geoip

• apt-get install iptables-dev xtables-addons-common libtext-csv-xs-perl pkg-config

V adresari /usr/lib/xtables-addons spustime prikaz xt_geoip_dl

• ./xt_geoip_dl

A potom vytvorime GeoIP databazi

• ./xt_geoip_build -D /usr/share/xt_geoip/ *.csv

138540 entries total
    0 IPv6 ranges for A1 Anonymous Proxy
   91 IPv4 ranges for A1 Anonymous Proxy
    0 IPv6 ranges for A2 Satellite Provider
  337 IPv4 ranges for A2 Satellite Provider
    3 IPv6 ranges for AD Andorra
   13 IPv4 ranges for AD Andorra
   46 IPv6 ranges for AE United Arab Emirates
  182 IPv4 ranges for AE United Arab Emirates
   14 IPv6 ranges for AF Afghanistan
   88 IPv4 ranges for AF Afghanistan
...

Nyni muzeme v iptables pracovat s databazi IP adres:

• -A FORWARD -m geoip --src-cc CN -d a.b.c.d/32 -j DROP

Seznam kodu jednotlivych statu nalezneme napr. zde ve wiki

apt install xtables-addons-common xtables-addons-dkms libtext-csv-xs-perl libnet-cidr-lite-perl

modprobe xt_geoip

Modul pridame take do /etc/modules-load.d/geoip.conf mkdir -p /usr/share/xt_geoip

#!/bin/bash
cd /tmp
/usr/libexec/xtables-addons/xt_geoip_dl
/usr/libexec/xtables-addons/xt_geoip_build -D /usr/share/xt_geoip *.csv

• Pokud pouzivame kernel verze 5.x v debianu 11, musime stahnout balicky xtables verze 3.18 z debianu testing (v debianu 11 je verze 3.11, kde nejde kompilovat dkms modul oproti 5.x kernelu