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tests/nat64-pref64: init
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‎tests/nat64-pref64/README.md‎

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# NAT64 with PREF64
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This configuration extends the [nat64-dns64](../nat64-dns64/) test by replacing DNS64
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functionality with PREF64. Instead of using a DNS64-enabled DNS server, the NAT64 gateway
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now uses radvd (Router Advertisement Daemon) to advertise IPv6 prefixes that embed IPv4 addresses,
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allowing the client to generate IPv6 addresses for IPv4 destinations automatically using clatd.
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```mermaid
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flowchart LR
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server["**Server**
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nginx HTTP server
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bind DNS server"]
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nat64gw["**NAT64 Gateway**
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jool NAT64
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dnsmasq DNS server
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radvd"]
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client["**Client**
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clatd"]
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server <-- ipv4 only --> nat64gw <-- ipv6 only --> client
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```

‎tests/nat64-pref64/client.nix‎

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{ lib, pkgs, ... }:
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{
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virtualisation.interfaces.eth1 = {
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vlan = 2;
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assignIP = false;
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};
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networking = {
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interfaces.eth1 = { };
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nameservers = [ "2001:db8::1" ];
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};
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services.clatd = {
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enable = true;
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settings = {
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plat-prefix = "64:ff9b::/96";
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debug = 1;
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};
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};
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systemd.services.clatd.preStart =
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let
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ip = lib.getExe' pkgs.iproute2 "ip";
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jq = lib.getExe pkgs.jq;
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in
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''
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while [ $(${ip} -j -6 address show eth1 | ${jq} '.[] | .addr_info | map(select((.scope == "global") and (.tentative == true))) | length') -ne 0 ]
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do
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sleep 0.1
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done
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'';
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}

‎tests/nat64-pref64/default.nix‎

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{
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lib,
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pkgs,
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...
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}:
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{
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name = "nat64-pref64";
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defaults = {
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networking = {
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useDHCP = false;
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firewall.enable = false;
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};
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};
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nodes = {
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server = import ./server.nix { inherit pkgs; };
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nat64gw = import ./nat64gw.nix;
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client = import ./client.nix { inherit lib pkgs; };
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};
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interactive.nodes = lib.listToAttrs (
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map
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(name: {
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inherit name;
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value.environment.systemPackages = with pkgs; [
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curl
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dig
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tcpdump
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pwru
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];
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})
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[
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"server"
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"client"
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"nat64gw"
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]
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);
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testScript =
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let
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curl = lib.getExe pkgs.curl;
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dig = lib.getExe pkgs.dig;
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jq = lib.getExe pkgs.jq;
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in
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''
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start_all()
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for m in [server, nat64gw, client]:
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m.wait_for_unit("network.target")
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server.wait_for_unit("nginx.service")
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server.wait_for_unit("bind.service")
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nat64gw.wait_for_unit("dnsmasq.service")
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nat64gw.wait_for_unit("jool-nat64-eth2.service")
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nat64gw.wait_for_unit("radvd.service")
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with subtest('ensure "public" dns server is working properly'):
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assert server.succeed("${dig} +short A example.com").strip() == "192.0.2.2"
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assert server.succeed("${dig} +short AAAA example.com").strip() == ""
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with subtest('ensure http server is online'):
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server.succeed("${curl} -sI http://example.com")
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with subtest('ensure ipv4 network between server and gateway is working'):
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server.succeed("ping -c 1 192.0.2.1")
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nat64gw.succeed("ping -c 1 192.0.2.2")
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# first dig fails for whatever reason
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nat64gw.succeed("${dig} A example.com @2001:db8::1")
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with subtest('ensure dns server on nat64gw works as expected'):
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assert nat64gw.succeed("${dig} +short A example.com @2001:db8::1").strip() == "192.0.2.2"
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assert nat64gw.succeed("${dig} +short AAAA example.com @2001:db8::1").strip() == ""
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with subtest('ensure ipv6 network between gateway and client is working'):
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client.wait_until_succeeds("""
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ip -j -6 a sh eth1 | \
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${jq} -r '.[] | .addr_info | .[] | select((.family == "inet6") and .dynamic == true) | .local' | \
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grep 2001:db8
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""")
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client.succeed("ping -6 -c 1 2001:db8::1")
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with subtest('ensure dns works as expected from client, and there is no aaaa record'):
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assert client.succeed("${dig} +short A example.com @2001:db8::1").strip() == "192.0.2.2"
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assert client.succeed("${dig} +short AAAA example.com @2001:db8::1").strip() == ""
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with subtest('ensure nat64 works as expected'):
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client.wait_until_succeeds("ping -6 -c 1 64:ff9b::192.0.2.2")
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client.wait_until_succeeds("${curl} -sI http://[64:ff9b::192.0.2.2] | grep 'HTTP/1.1 200 OK'")
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# clat needs to be started after slaac, restarting it now should be sufficient
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client.succeed("systemctl restart clatd")
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client.wait_for_unit("clatd.service")
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client.wait_until_succeeds("ip link show clat")
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with subtest('ensure clat uses correct address from ipv4 service continuity prefix'):
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client.wait_until_succeeds("""
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ip -j -4 address sh clat | ${jq} -e -r '.[].addr_info.[].local == "192.0.0.1"'
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""")
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with subtest('ensure clat created a ipv4 default route to attract ipv4 traffic'):
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client.wait_until_succeeds("""
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ip -4 -j route show default | ${jq} -e -r '.[].dev == "clat"'
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""")
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# for debugging purpose:
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print(client.succeed("${curl} -v http://example.com"))
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# connect to 192.0.2.2 port 80 from 192.0.0.1 port 37636 failed: No route to host
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with subtest('ensure clat works as expected'):
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client.succeed("${curl} -sI http://example.com | grep 'HTTP/1.1 200 OK'")
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'';
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}

‎tests/nat64-pref64/nat64gw.nix‎

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{
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virtualisation.interfaces.eth1 = {
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vlan = 1;
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assignIP = false;
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};
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virtualisation.interfaces.eth2 = {
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vlan = 2;
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assignIP = false;
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};
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networking.interfaces.eth1 = {
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ipv4.addresses = [
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{
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address = "192.0.2.1";
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prefixLength = 24;
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}
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];
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};
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networking.interfaces.eth2 = {
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ipv6.addresses = [
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{
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address = "2001:db8::1";
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prefixLength = 64;
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}
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];
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};
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# nat64
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boot.kernelModules = [ "jool" ];
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networking.jool = {
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enable = true;
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nat64.eth2.framework = "netfilter";
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};
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services.dnsmasq = {
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enable = true;
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alwaysKeepRunning = true;
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settings = {
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listen-address = "2001:db8::1";
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no-hosts = true;
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no-resolv = true;
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server = [
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"192.0.2.2"
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];
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};
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};
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services.radvd = {
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enable = true;
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config = ''
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interface eth2 {
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AdvSendAdvert on;
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prefix 2001:db8::/64 { };
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nat64prefix 64:ff9b::/96 { };
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};
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'';
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};
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}

‎tests/nat64-pref64/server.nix‎

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{ pkgs, ... }:
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{
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virtualisation.interfaces.eth1 = {
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vlan = 1;
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assignIP = false;
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};
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networking.interfaces.eth1 = {
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ipv4.addresses = [
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{
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address = "192.0.2.2";
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prefixLength = 24;
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}
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];
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};
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services.nginx = {
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enable = true;
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virtualHosts."example.com".locations."/".return = "200";
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};
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# public dns server
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services.resolved.enable = false;
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services.bind = {
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enable = true;
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cacheNetworks = [ "0.0.0.0/0" ];
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# first line (comment) is to align config
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extraOptions = ''
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#
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recursion yes;
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auth-nxdomain no;
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dnssec-validation no;
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'';
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zones."example.com" = {
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master = true;
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file = pkgs.writeText "zone-example.com.conf" ''
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$TTL 1
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@ IN SOA example.com. zonemaster.example.com. (
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2023013100 ; serial number
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86400 ; refresh: 1d
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900 ; update retry: 15m
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604800 ; expiry: 1w
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3600 ) ; negative caching 1h
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@ IN NS example.com.
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@ IN A 192.0.2.2
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'';
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};
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};
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networking.nameservers = [ "127.0.0.1" ];
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}

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