Migrate new file structure to crux (#435)

* order workflows and add submodule

* rename gitmodules file

* delete docs/.gitignore

* add vyos custom linter

* correct __pycache__ in gitignore

* add test-coverage.py

* move draw.io folder

* arrange changelog, install history and about

* arrange: firewall

* arrange: highavailability

* arrange: loadbalancing

* arrange: nat

* arrange: services

* sort configexamples and configuration interfaces

* wireles: rename wireless

* rearrange: Protocols and Policy

* rearrange: Firewall and Zone Policy

* rearrange: Interfaces

* rearrange: Interfaces

* rearrange: dynamic DNS

* hostinfo: add page to index

* rearrange: appendix

* venv: add Pipfile

* rearrange: contributing

* index: remove debugging

* rearrange: fix all figure and refs

* rearrange: commandtree

* fix: cli, openvpn, install headline level

* protocols: change headline

* firewall: move mss clamping

* ip: separate ipv4 and ipv6

* arp: move to static page

* igmp: rename multicast page

* Update to year 2021

1 files changed, 19 insertions, 0 deletions

diff --git a/docs/configuration/system/ntp.rst b/docs/configuration/system/ntp.rst
new file mode 100644
index 00000000..95ff0692
--- /dev/null
+++ b/docs/configuration/system/ntp.rst
@@ -0,0 +1,19 @@
+.. _ntp:
+
+NTP
+===
+
+there are 3 default NTP server set. You are able to change them.
+
+.. code-block:: none
+
+  set system ntp server 0.pool.ntp.org
+  set system ntp server 1.pool.ntp.org
+  set system ntp server 2.pool.ntp.org
+
+To set up VyOS as an NTP responder, you must specify the listen address and optionally the permitted clients.
+
+.. code-block:: none
+
+  set system ntp listen-address 192.168.199.1
+  set system ntp allow-clients address 192.168.199.0/24