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-rw-r--r--modules/networking/default.nix41
-rw-r--r--modules/networking/dhcpcd.nix12
-rw-r--r--modules/networking/firewall/default.nix11
-rw-r--r--modules/networking/firewall/fail2ban.nix20
-rw-r--r--modules/networking/i2p.nix48
-rw-r--r--modules/networking/ipv6.nix9
-rw-r--r--modules/networking/loopback.nix7
-rw-r--r--modules/networking/networkmanager.nix23
-rw-r--r--modules/networking/optimise.nix73
-rw-r--r--modules/networking/resolved.nix17
-rw-r--r--modules/networking/tor.nix27
-rw-r--r--modules/networking/vpn/default.nix6
-rw-r--r--modules/networking/vpn/pia.nix10
-rw-r--r--modules/networking/vpn/tailscale.nix15
14 files changed, 319 insertions, 0 deletions
diff --git a/modules/networking/default.nix b/modules/networking/default.nix
new file mode 100644
index 0000000..724693d
--- /dev/null
+++ b/modules/networking/default.nix
@@ -0,0 +1,41 @@
+{ secrets, ... }:
+{
+ imports = [
+ ./firewall
+ ./vpn
+ ./dhcpcd.nix
+ ./i2p.nix
+ ./ipv6.nix
+ ./loopback.nix
+ ./networkmanager.nix
+ ./optimise.nix
+ ./resolved.nix
+ ./tor.nix
+ ];
+
+ # https://discourse.nixos.org/t/rebuild-error-failed-to-start-network-manager-wait-online/41977/2
+ systemd.network.wait-online.enable = false;
+ boot.initrd.systemd.network.wait-online.enable = false;
+
+ # https://discourse.nixos.org/t/how-to-disable-networkmanager-wait-online-service-in-the-configuration-file/19963/2
+ systemd.services.NetworkManager-wait-online.enable = false;
+
+ networking = {
+ hostName = "kansai";
+ nftables.enable = true;
+
+ nameservers = [
+ "45.90.28.0#${secrets.nextdns_id}.dns.nextdns.io"
+ "2a07:a8c0::#${secrets.nextdns_id}.dns.nextdns.io"
+ "45.90.30.0#${secrets.nextdns_id}.dns.nextdns.io"
+ "2a07:a8c1::#${secrets.nextdns_id}.dns.nextdns.io"
+ ];
+
+ 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/networking/dhcpcd.nix b/modules/networking/dhcpcd.nix
new file mode 100644
index 0000000..f46b657
--- /dev/null
+++ b/modules/networking/dhcpcd.nix
@@ -0,0 +1,12 @@
+{
+ networking.dhcpcd = {
+ wait = "background";
+
+ extraConfig = ''
+ noarp
+ nooption domain_name_servers, domain_name, domain_search, host_name
+ nooption ntp_servers
+ nohook resolv.conf, wpa_supplicant
+ '';
+ };
+}
diff --git a/modules/networking/firewall/default.nix b/modules/networking/firewall/default.nix
new file mode 100644
index 0000000..074f398
--- /dev/null
+++ b/modules/networking/firewall/default.nix
@@ -0,0 +1,11 @@
+{
+ imports = [ ./fail2ban.nix ];
+
+ networking.firewall = {
+ enable = true;
+ allowPing = false;
+ logReversePathDrops = true;
+ logRefusedConnections = false;
+ checkReversePath = "loose";
+ };
+}
diff --git a/modules/networking/firewall/fail2ban.nix b/modules/networking/firewall/fail2ban.nix
new file mode 100644
index 0000000..6311b14
--- /dev/null
+++ b/modules/networking/firewall/fail2ban.nix
@@ -0,0 +1,20 @@
+{ pkgs, lib, ... }:
+{
+ services.fail2ban = {
+ enable = false;
+ banaction = "nftables-multiport";
+ banaction-allports = lib.mkDefault "nftables-allport";
+
+ extraPackages = with pkgs; [
+ nftables
+ ipset
+ ];
+
+ ignoreIP = [
+ "10.0.0.0/8"
+ "172.16.0.0/12"
+ "100.64.0.0/16"
+ "192.168.0.0/16"
+ ];
+ };
+}
diff --git a/modules/networking/i2p.nix b/modules/networking/i2p.nix
new file mode 100644
index 0000000..d94b5e4
--- /dev/null
+++ b/modules/networking/i2p.nix
@@ -0,0 +1,48 @@
+{
+ # https://voidcruiser.nl/rambles/i2p-on-nixos/
+ containers.i2pd = {
+ autoStart = true;
+
+ config = {
+ system.stateVersion = "24.05";
+
+ networking.firewall.allowedTCPPorts = [
+ 7656
+ 7070
+ 4447
+ 4444
+ ];
+
+ services.i2pd = {
+ enable = true;
+ address = "0.0.0.0";
+ upnp.enable = true;
+ bandwidth = 256;
+
+ proto = {
+ http.enable = true;
+ socksProxy.enable = true;
+ sam.enable = true;
+ i2cp.enable = true;
+
+ httpProxy = {
+ enable = true;
+ # outproxy = "http://false.i2p";
+ # outproxy = "http://purokishi.i2p:4444";
+ # outproxy = "http://outproxy.acetone.i2p:3128";
+ outproxy = "http://exit.stormycloud.i2p:4444";
+ # outproxy = "http://outproxy.bandura.i2p:4444";
+ };
+ };
+
+ addressbook.subscriptions = [
+ "http://inr.i2p/export/alive-hosts.txt"
+ "http://i2p-projekt.i2p/hosts.txt"
+ "http://stats.i2p/cgi-bin/newhosts.txt"
+ "http://reg.i2p/export/hosts.txt"
+ "http://notbob.i2p/hosts.txt"
+ ];
+ };
+ };
+ };
+}
diff --git a/modules/networking/ipv6.nix b/modules/networking/ipv6.nix
new file mode 100644
index 0000000..274c1ae
--- /dev/null
+++ b/modules/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/networking/loopback.nix b/modules/networking/loopback.nix
new file mode 100644
index 0000000..62e745e
--- /dev/null
+++ b/modules/networking/loopback.nix
@@ -0,0 +1,7 @@
+{ config, ... }:
+{
+ boot = {
+ kernelModules = [ "v4l2loopback" ];
+ extraModulePackages = with config.boot.kernelPackages; [ v4l2loopback ];
+ };
+}
diff --git a/modules/networking/networkmanager.nix b/modules/networking/networkmanager.nix
new file mode 100644
index 0000000..8672759
--- /dev/null
+++ b/modules/networking/networkmanager.nix
@@ -0,0 +1,23 @@
+{ pkgs, ... }:
+{
+ environment.systemPackages = [ pkgs.networkmanagerapplet ];
+
+ networking.networkmanager = {
+ enable = true;
+ plugins = [ pkgs.networkmanager-openvpn ];
+ # dns =
+ dns = "none"; # "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/networking/optimise.nix b/modules/networking/optimise.nix
new file mode 100644
index 0000000..c6f2bec
--- /dev/null
+++ b/modules/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/networking/resolved.nix b/modules/networking/resolved.nix
new file mode 100644
index 0000000..82effbe
--- /dev/null
+++ b/modules/networking/resolved.nix
@@ -0,0 +1,17 @@
+{ secrets, ... }:
+{
+ services.resolved = {
+ enable = false;
+ dnssec = "true";
+ domains = [ "~." ];
+ dnsovertls = "true";
+ llmnr = "false";
+
+ extraConfig = ''
+ DNS=45.90.28.0#${secrets.nextdns_id}.dns.nextdns.io
+ DNS=2a07:a8c0::#${secrets.nextdns_id}.dns.nextdns.io
+ DNS=45.90.30.0#${secrets.nextdns_id}.dns.nextdns.io
+ DNS=2a07:a8c1::#${secrets.nextdns_id}.dns.nextdns.io
+ '';
+ };
+}
diff --git a/modules/networking/tor.nix b/modules/networking/tor.nix
new file mode 100644
index 0000000..dfbfb3a
--- /dev/null
+++ b/modules/networking/tor.nix
@@ -0,0 +1,27 @@
+{ pkgs, ... }:
+{
+ services.tor = {
+ enable = true;
+ torsocks.enable = true;
+
+ client = {
+ enable = true;
+ dns.enable = true;
+ };
+ };
+
+ programs.proxychains = {
+ enable = true;
+ quietMode = false;
+ proxyDNS = true;
+ package = pkgs.proxychains-ng;
+
+ proxies = {
+ tor = {
+ type = "socks5";
+ host = "127.0.0.1";
+ port = 9050;
+ };
+ };
+ };
+}
diff --git a/modules/networking/vpn/default.nix b/modules/networking/vpn/default.nix
new file mode 100644
index 0000000..92a11b0
--- /dev/null
+++ b/modules/networking/vpn/default.nix
@@ -0,0 +1,6 @@
+{
+ imports = [
+ ./pia.nix
+ ./tailscale.nix
+ ];
+}
diff --git a/modules/networking/vpn/pia.nix b/modules/networking/vpn/pia.nix
new file mode 100644
index 0000000..d52dbf8
--- /dev/null
+++ b/modules/networking/vpn/pia.nix
@@ -0,0 +1,10 @@
+{ secrets, ... }:
+{
+ services.pia = {
+ enable = true;
+
+ authUserPass = {
+ inherit (secrets.pia) username password;
+ };
+ };
+}
diff --git a/modules/networking/vpn/tailscale.nix b/modules/networking/vpn/tailscale.nix
new file mode 100644
index 0000000..21f471a
--- /dev/null
+++ b/modules/networking/vpn/tailscale.nix
@@ -0,0 +1,15 @@
+{ config, ... }:
+{
+ networking.firewall.trustedInterfaces = [ "${config.services.tailscale.interfaceName}" ];
+
+ services.tailscale = {
+ enable = true;
+ useRoutingFeatures = "both";
+ };
+
+ # <https://tailscale.com/kb/1019/subnets/?tab=linux#step-1-install-the-tailscale-client>
+ boot.kernel.sysctl = {
+ "net.ipv4.ip_forward" = true;
+ "net.ipv6.conf.all.forwarding" = true;
+ };
+}
generated by cgit v1.2.3 (git 2.25.1) at 2026-05-11 10:41:33 +0000