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-rw-r--r--modules/system/networking/default.nix33
-rw-r--r--modules/system/networking/dhcpcd.nix6
-rw-r--r--modules/system/networking/fail2ban.nix18
-rw-r--r--modules/system/networking/firewall.nix12
-rw-r--r--modules/system/networking/ipv6.nix9
-rw-r--r--modules/system/networking/loopback.nix7
-rw-r--r--modules/system/networking/networkmanager.nix22
-rw-r--r--modules/system/networking/optimise.nix73
-rw-r--r--modules/system/networking/resolved.nix15
-rw-r--r--modules/system/networking/tor.nix6
-rw-r--r--modules/system/networking/vpn/default.nix6
-rw-r--r--modules/system/networking/vpn/pia.nix10
-rw-r--r--modules/system/networking/vpn/tailscale.nix4
13 files changed, 221 insertions, 0 deletions
diff --git a/modules/system/networking/default.nix b/modules/system/networking/default.nix
new file mode 100644
index 0000000..96f89d0
--- /dev/null
+++ b/modules/system/networking/default.nix
@@ -0,0 +1,33 @@
+{
+ imports = [
+ ./vpn
+ ./dhcpcd.nix
+ ./fail2ban.nix
+ ./firewall.nix
+ ./ipv6.nix
+ ./loopback.nix
+ ./networkmanager.nix
+ ./optimise.nix
+ ./resolved.nix
+ ./tor.nix
+ ];
+
+ networking = {
+ hostName = "kansai";
+ nftables.enable = true;
+
+ nameservers = [
+ "1.1.1.1#one.one.one.one"
+ "1.0.0.1#one.one.one.one"
+ "9.9.9.9#dns.quad9.net"
+ "149.112.112.112#dns.quad9.net"
+ ];
+
+ timeServers = [
+ "0.nixos.pool.ntp.org"
+ "1.nixos.pool.ntp.org"
+ "2.nixos.pool.ntp.org"
+ "3.nixos.pool.ntp.org"
+ ];
+ };
+}
diff --git a/modules/system/networking/dhcpcd.nix b/modules/system/networking/dhcpcd.nix
new file mode 100644
index 0000000..99ac0f3
--- /dev/null
+++ b/modules/system/networking/dhcpcd.nix
@@ -0,0 +1,6 @@
+{
+ networking.dhcpcd = {
+ wait = "background";
+ extraConfig = "noarp";
+ };
+}
diff --git a/modules/system/networking/fail2ban.nix b/modules/system/networking/fail2ban.nix
new file mode 100644
index 0000000..fa45565
--- /dev/null
+++ b/modules/system/networking/fail2ban.nix
@@ -0,0 +1,18 @@
+{ lib, config, ... }:
+{
+ services.fail2ban = {
+ enable = false;
+
+ ignoreIP = [
+ "10.0.0.0/8"
+ "172.16.0.0/12"
+ "192.168.0.0/16"
+ ];
+
+ jails.sshd.settings = {
+ enabled = true;
+ filter = "sshd[mode=aggressive]";
+ port = lib.strings.concatStringsSep "," (map toString config.services.openssh.ports);
+ };
+ };
+}
diff --git a/modules/system/networking/firewall.nix b/modules/system/networking/firewall.nix
new file mode 100644
index 0000000..569089c
--- /dev/null
+++ b/modules/system/networking/firewall.nix
@@ -0,0 +1,12 @@
+{
+ networking.firewall = {
+ enable = true;
+ allowedUDPPorts = [ 53 ];
+ allowPing = false;
+
+ allowedTCPPorts = [
+ 80
+ 443
+ ];
+ };
+}
diff --git a/modules/system/networking/ipv6.nix b/modules/system/networking/ipv6.nix
new file mode 100644
index 0000000..274c1ae
--- /dev/null
+++ b/modules/system/networking/ipv6.nix
@@ -0,0 +1,9 @@
+{
+ boot.kernel.sysctl = {
+ "net.ipv6.conf.enp42s0.disable_ipv6" = true;
+ "net.ipv6.conf.wlp4s0.disable_ipv6" = true;
+ "net.ipv6.conf.tun0.disable_ipv6" = true;
+ };
+
+ networking.enableIPv6 = false;
+}
diff --git a/modules/system/networking/loopback.nix b/modules/system/networking/loopback.nix
new file mode 100644
index 0000000..62e745e
--- /dev/null
+++ b/modules/system/networking/loopback.nix
@@ -0,0 +1,7 @@
+{ config, ... }:
+{
+ boot = {
+ kernelModules = [ "v4l2loopback" ];
+ extraModulePackages = with config.boot.kernelPackages; [ v4l2loopback ];
+ };
+}
diff --git a/modules/system/networking/networkmanager.nix b/modules/system/networking/networkmanager.nix
new file mode 100644
index 0000000..e5fdfc1
--- /dev/null
+++ b/modules/system/networking/networkmanager.nix
@@ -0,0 +1,22 @@
+{ pkgs, ... }:
+{
+ environment.systemPackages = [ pkgs.networkmanagerapplet ];
+
+ networking.networkmanager = {
+ enable = true;
+ plugins = [ pkgs.networkmanager-openvpn ];
+ dns = "systemd-resolved";
+ wifi.backend = "iwd";
+
+ unmanaged = [
+ "interface-name:tailscale*"
+ "interface-name:br-*"
+ "interface-name:rndis*"
+ "interface-name:docker*"
+ "interface-name:virbr*"
+ "interface-name:vboxnet*"
+ "interface-name:waydroid*"
+ "type:bridge"
+ ];
+ };
+}
diff --git a/modules/system/networking/optimise.nix b/modules/system/networking/optimise.nix
new file mode 100644
index 0000000..c6f2bec
--- /dev/null
+++ b/modules/system/networking/optimise.nix
@@ -0,0 +1,73 @@
+{
+ boot = {
+ kernelModules = [
+ "tls"
+ "tcp_bbr"
+ ];
+
+ kernel.sysctl = {
+ # TCP hardening
+ # Prevent bogus ICMP errors from filling up logs.
+ "net.ipv4.icmp_ignore_bogus_error_responses" = 1;
+ # Reverse path filtering causes the kernel to do source validation of
+ # packets received from all interfaces. This can mitigate IP spoofing.
+ "net.ipv4.conf.default.rp_filter" = 1;
+ "net.ipv4.conf.all.rp_filter" = 1;
+ # Do not accept IP source route packets (we're not a router)
+ "net.ipv4.conf.all.accept_source_route" = 0;
+ "net.ipv6.conf.all.accept_source_route" = 0;
+ # Don't send ICMP redirects (again, we're on a router)
+ "net.ipv4.conf.all.send_redirects" = 0;
+ "net.ipv4.conf.default.send_redirects" = 0;
+ # Refuse ICMP redirects (MITM mitigations)
+ "net.ipv4.conf.all.accept_redirects" = 0;
+ "net.ipv4.conf.default.accept_redirects" = 0;
+ "net.ipv4.conf.all.secure_redirects" = 0;
+ "net.ipv4.conf.default.secure_redirects" = 0;
+ "net.ipv6.conf.all.accept_redirects" = 0;
+ "net.ipv6.conf.default.accept_redirects" = 0;
+ # Protects against SYN flood attacks
+ "net.ipv4.tcp_syncookies" = 1;
+ # Incomplete protection again TIME-WAIT assassination
+ "net.ipv4.tcp_rfc1337" = 1;
+ # And other stuff
+ "net.ipv4.conf.all.log_martians" = true;
+ "net.ipv4.conf.default.log_martians" = true;
+ "net.ipv4.icmp_echo_ignore_broadcasts" = true;
+ "net.ipv6.conf.default.accept_ra" = 0;
+ "net.ipv6.conf.all.accept_ra" = 0;
+ "net.ipv4.tcp_timestamps" = 0;
+
+ # TCP optimization
+ # TCP Fast Open is a TCP extension that reduces network latency by packing
+ # data in the sender’s initial TCP SYN. Setting 3 = enable TCP Fast Open for
+ # both incoming and outgoing connections:
+ "net.ipv4.tcp_fastopen" = 3;
+ # Bufferbloat mitigations + slight improvement in throughput & latency
+ "net.ipv4.tcp_congestion_control" = "bbr";
+ "net.core.default_qdisc" = "cake";
+
+ # Other stuff that I am too lazy to document
+ "net.core.optmem_max" = 65536;
+ "net.core.rmem_default" = 1048576;
+ "net.core.rmem_max" = 16777216;
+ "net.core.somaxconn" = 8192;
+ "net.core.wmem_default" = 1048576;
+ "net.core.wmem_max" = 16777216;
+ "net.ipv4.ip_local_port_range" = "16384 65535";
+ "net.ipv4.tcp_max_syn_backlog" = 8192;
+ "net.ipv4.tcp_max_tw_buckets" = 2000000;
+ "net.ipv4.tcp_mtu_probing" = 1;
+ "net.ipv4.tcp_rmem" = "4096 1048576 2097152";
+ "net.ipv4.tcp_slow_start_after_idle" = 0;
+ "net.ipv4.tcp_tw_reuse" = 1;
+ "net.ipv4.tcp_wmem" = "4096 65536 16777216";
+ "net.ipv4.udp_rmem_min" = 8192;
+ "net.ipv4.udp_wmem_min" = 8192;
+ "net.netfilter.nf_conntrack_generic_timeout" = 60;
+ "net.netfilter.nf_conntrack_max" = 1048576;
+ "net.netfilter.nf_conntrack_tcp_timeout_established" = 600;
+ "net.netfilter.nf_conntrack_tcp_timeout_time_wait" = 1;
+ };
+ };
+}
diff --git a/modules/system/networking/resolved.nix b/modules/system/networking/resolved.nix
new file mode 100644
index 0000000..632ca7a
--- /dev/null
+++ b/modules/system/networking/resolved.nix
@@ -0,0 +1,15 @@
+{
+ services.resolved = {
+ enable = true;
+ dnssec = "true";
+ domains = [ "~." ];
+ dnsovertls = "true";
+
+ fallbackDns = [
+ "1.1.1.1#one.one.one.one"
+ "1.0.0.1#one.one.one.one"
+ "9.9.9.9#dns.quad9.net"
+ "149.112.112.112#dns.quad9.net"
+ ];
+ };
+}
diff --git a/modules/system/networking/tor.nix b/modules/system/networking/tor.nix
new file mode 100644
index 0000000..3e3831f
--- /dev/null
+++ b/modules/system/networking/tor.nix
@@ -0,0 +1,6 @@
+{
+ services.tor = {
+ enable = true;
+ client.enable = true;
+ };
+}
diff --git a/modules/system/networking/vpn/default.nix b/modules/system/networking/vpn/default.nix
new file mode 100644
index 0000000..92a11b0
--- /dev/null
+++ b/modules/system/networking/vpn/default.nix
@@ -0,0 +1,6 @@
+{
+ imports = [
+ ./pia.nix
+ ./tailscale.nix
+ ];
+}
diff --git a/modules/system/networking/vpn/pia.nix b/modules/system/networking/vpn/pia.nix
new file mode 100644
index 0000000..d52dbf8
--- /dev/null
+++ b/modules/system/networking/vpn/pia.nix
@@ -0,0 +1,10 @@
+{ secrets, ... }:
+{
+ services.pia = {
+ enable = true;
+
+ authUserPass = {
+ inherit (secrets.pia) username password;
+ };
+ };
+}
diff --git a/modules/system/networking/vpn/tailscale.nix b/modules/system/networking/vpn/tailscale.nix
new file mode 100644
index 0000000..5d51594
--- /dev/null
+++ b/modules/system/networking/vpn/tailscale.nix
@@ -0,0 +1,4 @@
+{
+ services.tailscale.enable = true;
+ networking.firewall.trustedInterfaces = [ "tailscale0" ];
+}
generated by cgit v1.2.3 (git 2.25.1) at 2026-05-11 11:26:11 +0000