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Fail2Ban: how to unban IPs that are blocked?
Fail2ban is a great tool for server owners to automatically ban suspicious IP addresses in server firewall. Here are the steps to unban an IP in Fail2ban.
fail2bain  sshd  security  firewall  iptables  hardening  servers  linux  systemadministration 
14 days ago by setecastronomy
How to configure ufw to forward port 80/443 to internal server hosted on LAN - nixCraft
I am using UFW to protect my network. How do I forward TCP HTTP port # 80 and 443 to an internal server hosted at and using UFW on Ubuntu Linux server?

UFW is an acronym for uncomplicated firewall. It is used for managing a Linux firewall and aims to provide an easy to use interface for the user. In this tutorial, you will learn how to forward incoming traffic to your server running ufw on port 80/443 to port 80/443 on another internal server hosted in your LAN/VLAN.
2017  iptables  ubuntu  firewall  networking  configuration  sysadmin  linux  cli  example  tips  blogpost 
5 weeks ago by ezequiel
How to do local port forwarding with iptables - Stack Overflow
Q: I have an application (server) listening on port 8080. I want to be able to forward port 80 to it, such that hitting http://localhost resolves my application (on localhost:8080).

This should be generalized for any port mapping (e.g. 80:8080 => P_src:P_target), and use best practices for modern *nix machines (e.g. Ubuntu).

N.B. This is all done locally, so there is no need to accept connections from anyone but localhost.
2015  forumthread  iptables  linux  firewall  cli  howto  tips  stackexchange  sysadmin  example  configuration  networking 
5 weeks ago by ezequiel
port forwarding - iptables redirect outside requests to - Unix & Linux Stack Exchange
The iptables rule you are using will work, but there is one additional change you need to make:

sysctl -w net.ipv4.conf.eth0.route_localnet=1
2014  2018  forumthread  iptables  linux  firewall  networking  configuration  sysadmin  cli  howto  tips  example  stackexchange 
5 weeks ago by ezequiel
Securing CoreOS with iptables | Jimmy Cuadra
[...] One of the issues I ran into was how to secure a CoreOS machine's public network. By default, a fresh CoreOS installation has no firewall rules, allowing all inbound network traffic.

In order to secure a CoreOS machine, I had to learn how to configure the firewall. I use the common iptables utility for this purpose. [...]
2015  blogpost  coreos  iptables  howto  guide  configuration  firewall  sysadmin  networking  linux 
5 weeks ago by ezequiel
[Solved] Wireguard - Help with Firewall Rules - Installing and Using OpenWrt - OpenWrt Forum
Q: I have managed to get a split tunnel wireguard vpn working on my road warrior android devices, but I am not sure if I did it properly.

In my current setup, I created a wireguard zone, and added the following rules: [...]
2019  forumthread  iptables  openwrt  configuration  sysadmin  networking  firewall  example  images  tips  wireguard  vpn 
6 weeks ago by ezequiel

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