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1# IPv6 Configuration {#sec-ipv6}
2
3IPv6 is enabled by default. Stateless address autoconfiguration is used
4to automatically assign IPv6 addresses to all interfaces, and Privacy
5Extensions (RFC 4946) are enabled by default. You can adjust the default
6for this by setting [](#opt-networking.tempAddresses). This option
7may be overridden on a per-interface basis by
8[](#opt-networking.interfaces._name_.tempAddress). You can disable
9IPv6 support globally by setting:
10
11```nix
12{
13 networking.enableIPv6 = false;
14}
15```
16
17You can disable IPv6 on a single interface using a normal sysctl (in
18this example, we use interface `eth0`):
19
20```nix
21{
22 boot.kernel.sysctl."net.ipv6.conf.eth0.disable_ipv6" = true;
23}
24```
25
26As with IPv4 networking interfaces are automatically configured via
27DHCPv6. You can configure an interface manually:
28
29```nix
30{
31 networking.interfaces.eth0.ipv6.addresses = [ {
32 address = "fe00:aa:bb:cc::2";
33 prefixLength = 64;
34 } ];
35}
36```
37
38For configuring a gateway, optionally with explicitly specified
39interface:
40
41```nix
42{
43 networking.defaultGateway6 = {
44 address = "fe00::1";
45 interface = "enp0s3";
46 };
47}
48```
49
50See [](#sec-ipv4) for similar examples and additional information.