nix/nixos/hosts/osaka-linode-01/firewall.nix

{ config, lib, pkgs, ... }: {
  networking.firewall.allowedUDPPorts = [
    3478  # Headscale DERP UDP
    10000 # Jitsi
  ];
  networking.firewall.allowedTCPPorts = [
    80    # HTTP
    443   # HTTPS
    25    # SMTP  (explicit TLS => STARTTLS)
    465   # ESMTP (implicit TLS)
    587   # ESMTP (explicit TLS => STARTTLS)
    143   # IMAP4 (explicit TLS => STARTTLS)
    993   # IMAP4 (implicit TLS)
    4190  # Sieve support
    42420 # Vintage Story
    25565 # Minecraft
    1443  # Headscale DERP
    4443  # jitsi-jvb
    5222  # Jitsi
    5347  # Jitsi
    5280  # Jitsi
  ];

  networking.firewall.extraCommands     = '' 
    iptables -t nat -A PREROUTING -i enp0s4 -d 172.234.84.222 --dport 80    -j DNAT --to-destination 10.100.0.2
    iptables -t nat -A PREROUTING -i enp0s4 -d 172.234.84.222 --dport 443   -j DNAT --to-destination 10.100.0.2
    iptables -t nat -A PREROUTING -i enp0s4 -d 172.234.84.222 --dport 25    -j DNAT --to-destination 10.100.0.2
    iptables -t nat -A PREROUTING -i enp0s4 -d 172.234.84.222 --dport 465   -j DNAT --to-destination 10.100.0.2
    iptables -t nat -A PREROUTING -i enp0s4 -d 172.234.84.222 --dport 587   -j DNAT --to-destination 10.100.0.2
    iptables -t nat -A PREROUTING -i enp0s4 -d 172.234.84.222 --dport 143   -j DNAT --to-destination 10.100.0.2
    iptables -t nat -A PREROUTING -i enp0s4 -d 172.234.84.222 --dport 993   -j DNAT --to-destination 10.100.0.2
    iptables -t nat -A PREROUTING -i enp0s4 -d 172.234.84.222 --dport 4190  -j DNAT --to-destination 10.100.0.2
    iptables -t nat -A PREROUTING -i enp0s4 -d 172.234.84.222 --dport 42420 -j DNAT --to-destination 10.100.0.2
    iptables -t nat -A PREROUTING -i enp0s4 -d 172.234.84.222 --dport 25565 -j DNAT --to-destination 10.100.0.2
    iptables -t nat -A PREROUTING -i enp0s4 -d 172.234.84.222 --dport 1443  -j DNAT --to-destination 10.100.0.2
    iptables -t nat -A PREROUTING -i enp0s4 -d 172.234.84.222 --dport 4443  -j DNAT --to-destination 10.100.0.2
    iptables -t nat -A PREROUTING -i enp0s4 -d 172.234.84.222 --dport 5222  -j DNAT --to-destination 10.100.0.2
    iptables -t nat -A PREROUTING -i enp0s4 -d 172.234.84.222 --dport 5347  -j DNAT --to-destination 10.100.0.2
    iptables -t nat -A PREROUTING -i enp0s4 -d 172.234.84.222 --dport 5280  -j DNAT --to-destination 10.100.0.2
    iptables -t nat -A PREROUTING -i enp0s4 -d 172.234.84.222 --dport 10000 -j DNAT --to-destination 10.100.0.2
    iptables -t nat -A PREROUTING -i enp0s4 -d 172.234.84.222 --dport 3478  -j DNAT --to-destination 10.100.0.2
  '';
}