![]() Under certain types of network congestion, it will improve your latency. Implement BBRīottleneck Bandwidth and Round-trip propagation time (BBR) is a TCP congestion control algorithm developed at Google. Save the iptables rules so that they persist after reboots: apt update & apt upgrade -y apt install iptables-persistent -y 1.2. iptables -A INPUT -p tcp -dport 22 -j ACCEPTĪdd a rule to open port 443, the HTTPS port: iptables -A INPUT -p tcp -dport 443 -j ACCEPTĭrop all unexpected input: iptables -P INPUT DROP ![]() If you can restrict the port 22 rule so that only certain source IP addresses are whitelisted for SSH access ( -s xx.xx.xx.xx/32), then so much the better. ![]() Issue each of these commands in turn: iptables -A INPUT -m conntrack -ctstate ESTABLISHED,RELATED -j ACCEPT iptables -A INPUT -i lo -j ACCEPT iptables -A INPUT -p icmp -icmp-type echo-request -j ACCEPT Therefore we will use iptables to build our basic firewall. However, in a moment we are going to install OpenVPN with a script that uses iptables. There are multiple ways to implement a firewall: nftables, iptables, ufw, and firewalld. The same server configuration can handle a client running Linux, Windows, or Android. The server in this article runs Debian 10 or a recent version of Ubuntu. We include server name indicator (SNI) in the TLS to make the connection look a bit more like a real HTTPS connection. It may work in some countries but not in others. Whether or not this gets through Deep Packet Inspection (DPI) depends on the sophistication of the DPI. OpenVPN is tunneled through Stunnel, thus resembling a TLS connection on port 443. This article describes one possible solution. People in not-free countries often have a problem with OpenVPN connections being blocked by government censors.
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