diff --git a/Linux_reinstall/Ubuntu/CloudInit/dhcp_interfaces.cfg b/Linux_reinstall/Ubuntu/CloudInit/dhcp_interfaces.cfg
index d63fff6..e747d2d 100644
--- a/Linux_reinstall/Ubuntu/CloudInit/dhcp_interfaces.cfg
+++ b/Linux_reinstall/Ubuntu/CloudInit/dhcp_interfaces.cfg
@@ -59,6 +59,10 @@ runcmd:
   - sed -ri '/set nocompatible/a\set backspace=2' /etc/vim/vimrc.tiny
   - mv /etc/netplan/50-cloud-init.yaml /etc/netplan/20-netcfg.yaml
   - netplan apply
+  - sed -i '/\[Definition\]/a allowipv6 = auto' /etc/fail2ban/fail2ban.conf
+  - sed -ri 's/backend.*/backend = systemd/g' /etc/fail2ban/jail.conf
+  - update-rc.d fail2ban enable
+  - /etc/init.d/fail2ban restart
   - rm -rf /etc/cloud/cloud.cfg.d/99-fake_cloud.cfg
   - touch /etc/cloud/cloud-init.disabled