Add 1.2.1 release notes.

docs/releasenotes.rst

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+.. _releasenotes:
+
+Appendix D - Release notes
+##########################
+
+1.2 (Crux)
+==========
+
+1.2.1
+-----
+
+VyOS 1.2.1 is a maintenance release made in April 2019.
+
+Resolved issues
+^^^^^^^^^^^^^^^
+
+* Package updates: kernel 4.19.32, open-vm-tools 10.3, latest Intel NIC drivers.
+* The kernel now includes drivers for various USB serial adapters, which allows people to add a serial console to a machine without onboard RS232, or connect to something else from the router (`T1326 <https://phabricator.vyos.net/T1326>`_).
+* The collection of network card firmware is now much more extensive.
+* VRRP now correctly uses a virtual rather than physical MAC addresses in the RFC-compliant mode (`T1271 <https://phabricator.vyos.net/T1271>`_).
+* DHCP WPAD URL option works correctly again (`T1330 <https://phabricator.vyos.net/T1330>`_)
+* Many to many NAT rules now can use source/destination and translation networks of non-matching size (`T1312 <https://phabricator.vyos.net/T1312>`_). If 1:1 network bits translation is desired, it’s now user’s responsibility to check if prefix length matches.
+* IPv6 network prefix translation is fixed (`T1290 <https://phabricator.vyos.net/T1290>`_).
+* Non-alphanumeric characters such as “>” can now be safely used in PPPoE passwords (`T1308 <https://phabricator.vyos.net/T1308>`_).
+* “show | commands” no longer fails when a config section ends with a leaf node such as “timezone” in “show system | commands” (`T1305 <https://phabricator.vyos.net/T1305>`_).
+* “show | commands” correctly works in config mode now (`T1235 <https://phabricator.vyos.net/T1235>`_).
+* VTI is now compatible with the DHCP-interface IPsec option (`T1298 <https://phabricator.vyos.net/T1298>`_).
+* “show dhcp server statistics” command was broken in latest Crux (`T1277 <https://phabricator.vyos.net/T1277>`_).
+* An issue with TFTP server refusing to listen on addresses other than loopback was fixed (`T1261 <https://phabricator.vyos.net/T1261>`_).
+* Template issue that might cause UDP broadcast relay fail to start is fixed (`T1224 <https://phabricator.vyos.net/T1224>`_).
+* VXLAN value validation is improved (`T1067 <https://phabricator.vyos.net/T1067>`_).
+* Blank hostnames in DHCP updates no longer can crash DNS forwarding (`T1211 <https://phabricator.vyos.net/T1211>`_).
+* Correct configuration is now generated for DHCPv6 relays with more than one upstream interface (`T1322 <https://phabricator.vyos.net/T1322>`_).
+* “relay-agents-packets” option works correctly now (`T1234 <https://phabricator.vyos.net/T1234>`_).
+* Dynamic DNS data is now cleaned on configuration change (`T1231 <https://phabricator.vyos.net/T1231>`_).
+* Remote Syslog can now use a fully qualified domain name (`T1282 <https://phabricator.vyos.net/T1282>`_).
+* ACPI power off works again (`T1279 <https://phabricator.vyos.net/T1279>`_).
+* Negation in WAN load balancing rules works again (`T1247 <https://phabricator.vyos.net/T1247>`_).
+* FRR’s staticd now starts on boot correctly (`T1218 <https://phabricator.vyos.net/T1218>`_).
+* The installer now correctly detects SD card devices (`T1296 <https://phabricator.vyos.net/T1296>`_).
+* Wireguard peers can be disabled now (`T1225 <https://phabricator.vyos.net/T1225>`_).
+* The issue with wireguard interfaces impossible to delete is fixed (`T1217 <https://phabricator.vyos.net/T1217>`_).
+* Unintended IPv6 access is fixed in SNMP configuration (`T1160 <https://phabricator.vyos.net/T1160>`_).
+* It’s now possible to exclude hosts from the transparent web proxy (`T1060 <https://phabricator.vyos.net/T1060>`_).
+* An issue with rules impossible to delete from the zone-based firewall is fixed (`T484 <https://phabricator.vyos.net/T484>`_).
+
+Earlier releases
+================
+
+See `the wiki <https://wiki.vyos.net/wiki/1.2.0/release_notes>`_.