1 # This test verifies that we can ping an IPv4-only server from an IPv6-only
2 # client via a NAT64 router. The hosts and networks are configured as follows:
5 # Client | eth1 Address: 2001:db8::2/64
6 # | | Route: 64:ff9b::/96 via 2001:db8::1
10 # | eth2 Address: 2001:db8::1/64
12 # | nat64 Address: 64:ff9b::1/128
13 # | Route: 64:ff9b::/96
14 # | Address: 192.0.2.0/32
15 # | Route: 192.0.2.0/24
17 # | eth1 Address: 100.64.0.1/24
21 # Server | eth1 Address: 100.64.0.2/24
22 # | Route: 192.0.2.0/24 via 100.64.0.1
25 import ./make-test-python.nix ({ pkgs, lib, ... }:
29 meta = with pkgs.lib.maintainers; {
30 maintainers = [ hax404 ];
34 # The server is configured with static IPv4 addresses. RFC 6052 Section 3.1
35 # disallows the mapping of non-global IPv4 addresses like RFC 1918 into the
36 # Well-Known Prefix 64:ff9b::/96. TAYGA also does not allow the mapping of
37 # documentation space (RFC 5737). To circumvent this, 100.64.0.2/24 from
38 # RFC 6589 (Carrier Grade NAT) is used here.
39 # To reach the IPv4 address pool of the NAT64 gateway, there is a static
40 # route configured. In normal cases, where the router would also source NAT
41 # the pool addresses to one IPv4 addresses, this would not be needed.
43 virtualisation.vlans = [
48 interfaces.eth1 = lib.mkForce {};
53 matchConfig.Name = "eth1";
58 { routeConfig = { Destination = "192.0.2.0/24"; Gateway = "100.64.0.1"; }; }
64 # The router is configured with static IPv4 addresses towards the server
65 # and IPv6 addresses towards the client. For NAT64, the Well-Known prefix
66 # 64:ff9b::/96 is used. NAT64 is done with TAYGA which provides the
67 # tun-interface nat64 and does the translation over it. The IPv6 packets
68 # are sent to this interfaces and received as IPv4 packets and vice versa.
69 # As TAYGA only translates IPv6 addresses to dedicated IPv4 addresses, it
70 # needs a pool of IPv4 addresses which must be at least as big as the
71 # expected amount of clients. In this test, the packets from the pool are
72 # directly routed towards the client. In normal cases, there would be a
73 # second source NAT44 to map all clients behind one IPv4 address.
75 boot.kernel.sysctl = {
76 "net.ipv4.ip_forward" = 1;
77 "net.ipv6.conf.all.forwarding" = 1;
80 virtualisation.vlans = [
88 firewall.enable = false;
89 interfaces.eth1 = lib.mkForce {
91 addresses = [ { address = "100.64.0.1"; prefixLength = 24; } ];
94 interfaces.eth2 = lib.mkForce {
96 addresses = [ { address = "2001:db8::1"; prefixLength = 64; } ];
104 address = "192.0.2.0";
106 address = "192.0.2.1";
109 address = "192.0.2.0";
114 address = "2001:db8::1";
116 address = "64:ff9b::1";
119 address = "64:ff9b::";
127 boot.kernel.sysctl = {
128 "net.ipv4.ip_forward" = 1;
129 "net.ipv6.conf.all.forwarding" = 1;
132 virtualisation.vlans = [
139 firewall.enable = false;
140 interfaces.eth1 = lib.mkForce {
142 addresses = [ { address = "100.64.0.1"; prefixLength = 24; } ];
145 interfaces.eth2 = lib.mkForce {
147 addresses = [ { address = "2001:db8::1"; prefixLength = 64; } ];
155 address = "192.0.2.0";
157 address = "192.0.2.1";
160 address = "192.0.2.0";
165 address = "2001:db8::1";
167 address = "64:ff9b::1";
170 address = "64:ff9b::";
177 # The client is configured with static IPv6 addresses. It has also a static
178 # route for the NAT64 IP space where the IPv4 addresses are mapped in. In
179 # normal cases, there would be only a default route.
181 virtualisation.vlans = [
187 interfaces.eth1 = lib.mkForce {};
193 matchConfig.Name = "eth1";
198 { routeConfig = { Destination = "64:ff9b::/96"; Gateway = "2001:db8::1"; }; }
202 environment.systemPackages = [ pkgs.mtr ];
207 # start client and server
208 for machine in client, server:
209 machine.wait_for_unit("network-online.target")
210 machine.log(machine.execute("ip addr")[1])
211 machine.log(machine.execute("ip route")[1])
212 machine.log(machine.execute("ip -6 route")[1])
214 # test systemd-networkd and nixos-scripts based router
215 for router in router_systemd, router_nixos:
217 router.wait_for_unit("network-online.target")
218 router.wait_for_unit("tayga.service")
219 router.log(machine.execute("ip addr")[1])
220 router.log(machine.execute("ip route")[1])
221 router.log(machine.execute("ip -6 route")[1])
223 with subtest("Wait for tayga"):
224 router.wait_for_unit("tayga.service")
226 with subtest("Test ICMP"):
227 client.wait_until_succeeds("ping -c 3 64:ff9b::100.64.0.2 >&2")
229 with subtest("Test ICMP and show a traceroute"):
230 client.wait_until_succeeds("mtr --show-ips --report-wide 64:ff9b::100.64.0.2 >&2")
232 router.log(router.execute("systemd-analyze security tayga.service")[1])