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README.md
clatd - CLAT and SIIT-DC Edge Relay for Linux
clatd implements the CLAT component of the 464XLAT network architecture specified in RFC 6877. It allows an IPv6-only host to have IPv4 connectivity that is translated to IPv6 before being routed to an upstream PLAT (which is typically a Stateful NAT64 operated by the ISP) and there translated back to IPv4 before being routed to the IPv4 internet. This is especially useful when local applications on the host requires actual IPv4 connectivity or cannot make use of DNS64 (for example because they use legacy AF_INET socket calls, or if they are simply not using DNS64).
clatd may also be used to implement an SIIT-DC Edge Relay as described in
RFC 7756. In this scenario, the PLAT is in reality a SIIT-DC Border Relay
(see RFC 7755) instead of a Stateful NAT64 (see RFC 6146). When used as a
SIIT-DC Edge Relay, you will probably want to manually configure the settings
clat-v4-addr, clat-v6-addr, and plat-prefix to mirror the SIIT-DC
Border Relay's configuration.
It relies either on the software package TAYGA by Nathan Lutchansky or on the kernel module nat46 by Andrew Yourtchenko for the actual translation of packets between IPv4 and IPv6 (RFC 6145) TAYGA may be downloaded from its home page at http://www.litech.org/tayga/, nat46 from its repository at https://github.com/ayourtch/nat46.
Installing
clatd is available in the following distributions:
Probably others also. If clatd is not available from your distribution or you would like to test the bleeding-edge version of clatd from git use the following commands:
$ git clone https://github.com/toreanderson/clatd
$ sudo make -C clatd installdeps start
This will install clatd, dependencies, systemd services, NetworkManager dispatcher integration scripts on your system, enable and start the clatd.service. Really only recommended for testing.
Beware that TAYGA isn't available in all RPM-based distros (in particular RHEL and its clones). It is however available in EPEL (see https://fedoraproject.org/wiki/EPEL).
Using
For extensive usage instruction please refer to the clatd(8) manpage.
Bugs
If you are experiencing any bugs or have any feature requests, head over to
https://github.com/toreanderson/clatd/issues and submit a new issue (if
someone else hasn't already done so). Please make sure to include logs with
full debugging output (using -d -d on the command line or debug=2 in
the configuration file) when reporting a bug.
License
Copyright (c) 2014-2025 Tore Anderson tore@fud.no
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.