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-.. _troubleshooting:
-
-###############
-Troubleshooting
-###############
-
-Sometimes things break or don't work as expected. This section describes
-several troubleshooting tools provided by VyOS that can help when something
-goes wrong.
-
-******************
-Connectivity Tests
-******************
-
-Basic Connectivity Tests
-========================
-
-Verifying connectivity can be done with the familiar `ping` and `traceroute`
-commands. The options for each are shown (the options for each command were
-displayed using the built-in help as described in the :ref:`cli`
-section and are omitted from the output here):
-
-.. opcmd:: ping <destination>
-
-   Send ICMP echo requests to destination host. There are multiple options to
-   ping, inkl. VRF support.
-
-   .. code-block:: none
-
-     vyos@vyos:~$ ping 10.1.1.1
-     Possible completions:
-       <Enter>       Execute the current command
-       adaptive      Ping options
-       allow-broadcast
-       audible
-       bypass-route
-       count
-       deadline
-       flood
-       interface
-       interval
-       mark
-       no-loopback
-       numeric
-       pattern
-       quiet
-       record-route
-       size
-       timestamp
-       tos
-       ttl
-       verbose
-       vrf
-
-
-.. opcmd:: traceroute <destination>
-
-   Trace path to target.
-
-   .. code-block:: none
-
-     vyos@vyos:~$ traceroute
-     Possible completions:
-       <hostname>    Track network path to specified node
-       <x.x.x.x>
-       <h:h:h:h:h:h:h:h>
-       ipv4          Track network path to <hostname|IPv4 address>
-       ipv6          Track network path to <hostname|IPv6 address>
-
-
-Advanced Connectivity Tests
-===========================
-
-.. opcmd:: monitor traceroute <destination>
-
-   However, another helper is available which combines ping and traceroute
-   into a single tool. An example of its output is shown:
-
-   .. code-block:: none
-
-     vyos@vyos:~$ mtr 10.62.212.12
-
-                                My traceroute  [v0.85]
-     vyos (0.0.0.0)
-     Keys:  Help   Display mode   Restart statistics   Order of fields   quit
-                                       Packets               Pings
-     Host                            Loss%   Snt   Last   Avg  Best  Wrst StDev
-     1. 10.11.110.4                   0.0%    34    0.5   0.5   0.4   0.8   0.1
-     2. 10.62.255.184                 0.0%    34    1.1   1.0   0.9   1.4   0.1
-     3. 10.62.255.71                  0.0%    34    1.4   1.4   1.3   2.0   0.1
-     4. 10.62.212.12                  0.0%    34    1.6   1.6   1.6   1.7   0.0
-
-   .. note:: The output consumes the screen and will replace your command
-      prompt.
-
-   Several options are available for changing the display output. Press `h` to
-   invoke the built in help system. To quit, just press `q` and you'll be
-   returned to the VyOS command prompt.
-
-IPv6 Topology Discovery
-=======================
-
-IPv6 uses different techniques to discover its Neighbors/topology.
-
-Router Discovery
-----------------
-
-.. opcmd:: force ipv6-rd interface <interface> [address <ipv6-address>]
-
-   Discover routers via eth0.
-
-   Example:
-
-   .. code-block:: none
-
-     vyos@vyos:~$ force ipv6-rd interface eth0
-     Soliciting ff02::2 (ff02::2) on eth0...
-
-     Hop limit                 :           60 (      0x3c)
-     Stateful address conf.    :           No
-     Stateful other conf.      :           No
-     Mobile home agent         :           No
-     Router preference         :         high
-     Neighbor discovery proxy  :           No
-     Router lifetime           :         1800 (0x00000708) seconds
-     Reachable time            :  unspecified (0x00000000)
-     Retransmit time           :  unspecified (0x00000000)
-      Prefix                   : 240e:fe:8ca7:ea01::/64
-       On-link                 :          Yes
-       Autonomous address conf.:          Yes
-       Valid time              :      2592000 (0x00278d00) seconds
-       Pref. time              :        14400 (0x00003840) seconds
-      Prefix                   : fc00:470:f1cd:101::/64
-       On-link                 :          Yes
-       Autonomous address conf.:          Yes
-       Valid time              :      2592000 (0x00278d00) seconds
-       Pref. time              :        14400 (0x00003840) seconds
-      Recursive DNS server     : fc00:470:f1cd::ff00
-       DNS server lifetime     :          600 (0x00000258) seconds
-      Source link-layer address: 00:98:2B:F8:3F:11
-      from fe80::298:2bff:fef8:3f11
-
-Neighbor Discovery
-------------------
-
-.. opcmd:: force ipv6-nd interface <interface> address <ipv6-address>
-
-
-   Example:
-
-   .. code-block:: none
-
-     vyos@vyos:~$ force ipv6-nd interface eth0 address fc00:470:f1cd:101::1
-
-     Soliciting fc00:470:f1cd:101::1 (fc00:470:f1cd:101::1) on eth0...
-     Target link-layer address: 00:98:2B:F8:3F:11 from fc00:470:f1cd:101::1
-
-
-***************
-Interface names
-***************
-
-If you find the names of your interfaces have changed, this could be because your MAC addresses have changed.
-
-* For example, you have a VyOS VM with 4 Ethernet interfaces named eth0, eth1, eth2 and eth3. Then, you migrate your VyOS VM to a different host and find your interfaces now are eth4, eth5, eth6 and eth7.
-
-  One way to fix this issue **taking control of the MAC addresses** is:
-
-  Log into VyOS and run this command to display your interface settings.
-
-  .. code-block:: none
-
-     show interfaces detail
-
-  Take note of MAC addresses.
-
-  Now, in order to update a MAC address in the configuration, run this command specifying the interface name and MAC address you want.
-
-  .. code-block:: none
-
-     set interfaces eth0 hw-id 00:0c:29:da:a4:fe
-
-  If it is a VM, go into the settings of the host and set the MAC address to the settings found in the config.boot file. You can also set the MAC to static if the host allows so.
-
-
-* Another example could be when cloning VyOS VMs in GNS3 and you get into the same issue: interface names have changed.
-  
-  And **a more generic way to fix it** is just deleting every MAC address at the configuration file of the cloned machine. They will be correctly regenerated automatically.
-
-
-**********
-Monitoring
-**********
-
-VyOS features several monitoring tools.
-
-.. code-block:: none
-
-  vyos@vyos:~$ monitor
-  Possible completions:
-    bandwidth     Monitor interface bandwidth in real time
-    bandwidth-test
-                  Initiate or wait for bandwidth test
-    cluster       Monitor clustering service
-    command       Monitor an operational mode command (refreshes every 2 seconds)
-    conntrack-sync
-                  Monitor conntrack-sync
-    content-inspection
-                  Monitor Content-Inspection
-    dhcp          Monitor Dynamic Host Control Protocol (DHCP)
-    dns           Monitor a Domain Name Service (DNS) daemon
-    firewall      Monitor Firewall
-    https         Monitor the Secure Hypertext Transfer Protocol (HTTPS) service
-    lldp          Monitor Link Layer Discovery Protocol (LLDP) daemon
-    log           Monitor last lines of messages file
-    nat           Monitor network address translation (NAT)
-    ndp           Monitor the NDP information received by the router through the device
-    openvpn       Monitor OpenVPN
-    protocol      Monitor routing protocols
-    snmp          Monitor Simple Network Management Protocol (SNMP) daemon
-    stop-all      Stop all current background monitoring processes
-    traceroute    Monitor the path to a destination in realtime
-    traffic       Monitor traffic dumps
-    vpn           Monitor VPN
-    vrrp          Monitor Virtual Router Redundancy Protocol (VRRP)
-    webproxy      Monitor Webproxy service
-
-
-Traffic Dumps
-=============
-
-To monitor interface traffic, issue the :code:`monitor traffic interface <name>`
-command, replacing `<name>` with your chosen interface.
-
-.. code-block:: none
-
-  vyos@vyos:~$ monitor traffic interface eth0
-  tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
-  listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
-  15:54:28.581601 IP 192.168.0.1 > vyos: ICMP echo request, id 1870, seq 3848, length 64
-  15:54:28.581660 IP vyos > 192.168.0.1: ICMP echo reply, id 1870, seq 3848, length 64
-  15:54:29.583399 IP 192.168.0.1 > vyos: ICMP echo request, id 1870, seq 3849, length 64
-  15:54:29.583454 IP vyos > 192.168.0.1: ICMP echo reply, id 1870, seq 3849, length 64
-  ^C
-  4 packets captured
-  4 packets received by filter
-  0 packets dropped by kernel
-  vyos@vyos:~$
-
-To quit monitoring, press `Ctrl-c` and you'll be returned to the VyOS command
-prompt.
-
-Traffic can be filtered and saved.
-
-.. code-block:: none
-
-  vyos@vyos:~$ monitor traffic interface eth0
-  Possible completions:
-    <Enter>       Execute the current command
-    filter        Monitor traffic matching filter conditions
-    save          Save traffic dump from an interface to a file
-
-
-Interface Bandwidth Usage
-=========================
-
-to take a quick view on the used bandwidth of an interface use the ``monitor
-bandwidth`` command
-
-.. code-block:: none
-
-  vyos@vyos:~$ monitor bandwidth interface eth0
-
-show the following:
-
-.. code-block:: none
-
-         B                      (RX Bytes/second)
-    198.00 .|....|.....................................................
-    165.00 .|....|.....................................................
-    132.00 ||..|.|.....................................................
-     99.00 ||..|.|.....................................................
-     66.00 |||||||.....................................................
-     33.00 |||||||.....................................................
-           1   5   10   15   20   25   30   35   40   45   50   55   60
-
-       KiB                      (TX Bytes/second)
-      3.67 ......|.....................................................
-      3.06 ......|.....................................................
-      2.45 ......|.....................................................
-      1.84 ......|.....................................................
-      1.22 ......|.....................................................
-      0.61 :::::||.....................................................
-           1   5   10   15   20   25   30   35   40   45   50   55   60
-
-Interface Performance
-=====================
-
-To take a look on the network bandwidth between two nodes, the ``monitor
-bandwidth-test`` command is used to run iperf.
-
-.. code-block:: none
-
-  vyos@vyos:~$ monitor bandwidth-test
-  Possible completions:
-    accept        Wait for bandwidth test connections (port TCP/5001)
-    initiate      Initiate a bandwidth test
-
-* The ``accept`` command opens a listening iperf server on TCP Port 5001
-* The ``initiate`` command connects to that server to perform the test.
-
-.. code-block:: none
-
-  vyos@vyos:~$ monitor bandwidth-test initiate
-  Possible completions:
-    <hostname>    Initiate a bandwidth test to specified host (port TCP/5001)
-    <x.x.x.x>
-    <h:h:h:h:h:h:h:h>
-
-
-Monitor command
-===============
-
-The ``monitor command`` command allows you to repeatedly run a command to view
-a continuously refreshed output. The command is run and output every 2 seconds,
-allowing you to monitor the output continuously without having to re-run the
-command. This can be useful to follow routing adjacency formation.
-
-.. code-block:: none
-
-  vyos@router:~$ monitor command "show interfaces"
-
-Will clear the screen and show you the output of ``show interfaces`` every
-2 seconds.
-
-.. code-block:: none
-
-  Every 2.0s: /opt/vyatta/bin/vyatta-op-cmd-wrapper    Sun Mar 26 02:49:46 2019
-
-  Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
-  Interface        IP Address                        S/L  Description
-  ---------        ----------                        ---  -----------
-  eth0             192.168.1.1/24                    u/u
-  eth0.5           198.51.100.4/24                   u/u  WAN
-  lo               127.0.0.1/8                       u/u
-                   ::1/128
-  vti0             172.25.254.2/30                   u/u
-  vti1             172.25.254.9/30                   u/u
-
-****************
-Terminal/Console
-****************
-
-Sometimes you need to clear counters or statistics to troubleshoot better.
-
-To do this use the ``clear`` command in Operational mode.
-
-to clear the console output
-
-.. code-block:: none
-
-  vyos@vyos:~$ clear console
-
-to clear interface counters
-
-.. code-block:: none
-
-  # clear all interfaces
-  vyos@vyos:~$ clear interface ethernet counters
-  # clear specific interface
-  vyos@vyos:~$ clear interface ehternet eth0 counters
-
-The command follow the same logic as the ``set`` command in configuration mode.
-
-.. code-block:: none
-
-  # clear all counters of a interface type
-  vyos@vyos:~$ clear interface <interface_type> counters
-  # clear counter of a interface in interface_type
-  vyos@vyos:~$ clear interface <interface_type> <interace_name> counters
-
-
-to clear counters on firewall rulesets or single rules
-
-.. code-block:: none
-
-  vyos@vyos:~$ clear firewall name <ipv4 ruleset name> counters
-  vyos@vyos:~$ clear firewall name <ipv4 ruleset name> rule <rule#> counters
-
-  vyos@vyos:~$ clear firewall ipv6-name <ipv6 ruleset name> counters
-  vyos@vyos:~$ clear firewall ipv6-name <ipv6 ruleset name> rule <rule#> counters
-
-
-******************
-System Information
-******************
-
-.. _boot-steps:
-
-Boot Steps
-==========
-
-VyOS 1.2 uses `Debian Jessie`_ as the base Linux operating system. Jessie was
-the first version of Debian that uses systemd_ as the default init system.
-
-These are the boot steps for VyOS 1.2
-
-1. The BIOS loads Grub (or isolinux for the Live CD)
-2. Grub then starts the Linux boot and loads the Linux Kernel ``/boot/vmlinuz``
-3. Kernel Launches Systemd ``/lib/systemd/systemd``
-4. Systemd loads the VyOS service file
-   ``/lib/systemd/system/vyos-router.service``
-5. The service file launches the VyOS router init script
-   ``/usr/libexec/vyos/init/vyos-router`` - this is part of the vyatta-cfg_
-   Debian package
-
-  1. Starts FRR_ - successor to `GNU Zebra`_ and Quagga_
-
-  2. Initialises the boot configuration file - copies over
-     ``config.boot.default`` if there is no configuration
-  3. Runs the configuration migration, if the configuration is for an older
-     version of VyOS
-  4. Runs The pre-config script, if there is one
-     ``/config/scripts/vyos-preconfig-bootup.script``
-  5. If the config file was upgraded, runs any post upgrade scripts
-     ``/config/scripts/post-upgrade.d``
-  6. Starts ``rl-system`` and ``firewall``
-  7. Mounts the ``/boot`` partition
-  8. The boot configuration file is then applied by ``/opt/vyatta/sbin/
-     vyatta-boot-config-loader/opt/vyatta/etc/config/config.boot``
-
-    1. The config loader script writes log entries to
-       ``/var/log/vyatta-config-loader.log``
-
-  10. Runs ``telinit q`` to tell the init system to reload ``/etc/inittab``
-  11. Finally it runs the post-config script
-      ``/config/scripts/vyos-postconfig-bootup.script``
-
-.. _Quagga: https://www.quagga.net/
-.. _`GNU Zebra`: https://www.gnu.org/software/zebra/
-.. _FRR: https://frrouting.org/
-.. _vyatta-cfg: https://github.com/vyos/vyatta-cfg
-.. _systemd: https://freedesktop.org/wiki/Software/systemd/
-.. _`Debian Jessie`: https://www.debian.org/releases/jessie/
-.. _tshark: https://www.wireshark.org/docs/man-pages/tshark.html
-.. _`PCAP filter expressions`: http://www.tcpdump.org/manpages/pcap-filter.7.html