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# Module for the IPv6 Router Advertisement Daemon.
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.radvd;
confFile = pkgs.writeText "radvd.conf" cfg.config;
in
{
###### interface
options = {
services.radvd.enable = mkOption {
default = false;
description =
''
Whether to enable the Router Advertisement Daemon
(<command>radvd</command>), which provides link-local
advertisements of IPv6 router addresses and prefixes using
the Neighbor Discovery Protocol (NDP). This enables
stateless address autoconfiguration in IPv6 clients on the
network.
'';
};
services.radvd.config = mkOption {
example =
''
interface eth0 {
AdvSendAdvert on;
prefix 2001:db8:1234:5678::/64 { };
};
'';
description =
''
The contents of the radvd configuration file.
'';
};
};
###### implementation
config = mkIf cfg.enable {
environment.systemPackages = [ pkgs.radvd ];
jobs.radvd =
{ description = "IPv6 Router Advertisement Daemon";
startOn = "started network-interfaces";
preStart =
''
# !!! Radvd only works if IPv6 forwarding is enabled. But
# this should probably be done somewhere else (and not
# necessarily for all interfaces).
echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
'';
exec = "${pkgs.radvd}/sbin/radvd -m syslog -s -C ${confFile}";
daemonType = "fork";
};
};
}
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