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authorChristian Poessinger <christian@poessinger.com>2020-07-11 17:52:09 +0200
committerChristian Poessinger <christian@poessinger.com>2020-07-11 17:52:09 +0200
commitfae5afae2f38737c0a869efdcd837a040f4e4f82 (patch)
tree2be82443d4788efb10d18798c81d19eed6379ae2
parent2819eb76a3b3310bb59ef14a0831c7d2fe59a5f5 (diff)
downloadvyos-documentation-fae5afae2f38737c0a869efdcd837a040f4e4f82.tar.gz
vyos-documentation-fae5afae2f38737c0a869efdcd837a040f4e4f82.zip
snmp: adjust to latest CLI syntax
-rw-r--r--docs/services/snmp.rst101
1 files changed, 53 insertions, 48 deletions
diff --git a/docs/services/snmp.rst b/docs/services/snmp.rst
index c27cf02a..3f445ea8 100644
--- a/docs/services/snmp.rst
+++ b/docs/services/snmp.rst
@@ -1,11 +1,14 @@
+.. _snmp:
+
+####
SNMP
-----
+####
-Simple Network Management Protocol (SNMP_) is an Internet Standard protocol
-for collecting and organizing information about managed devices on IP networks
-and for modifying that information to change device behavior. Devices that
-typically support SNMP include cable modems, routers, switches, servers,
-workstations, printers, and more.
+:abbr:`SNMP (Simple Network Management Protocol)` is an Internet Standard
+protocol for collecting and organizing information about managed devices on
+IP networks and for modifying that information to change device behavior.
+Devices that typically support SNMP include cable modems, routers, switches,
+servers, workstations, printers, and more.
SNMP is widely used in network management for network monitoring. SNMP exposes
management data in the form of variables on the managed systems organized in
@@ -23,7 +26,7 @@ management, including an application layer protocol, a database schema, and a
set of data objects.
Overview and basic concepts
-^^^^^^^^^^^^^^^^^^^^^^^^^^^
+===========================
In typical uses of SNMP, one or more administrative computers called managers
have the task of monitoring or managing a group of hosts or devices on a
@@ -63,15 +66,15 @@ network.
.. note:: VyOS SNMP supports both IPv4 and IPv6.
-SNMP protocol versions
-^^^^^^^^^^^^^^^^^^^^^^
+SNMP Protocol Versions
+======================
VyOS itself supports SNMPv2_ (version 2) and SNMPv3_ (version 3) where the
later is recommended because of improved security (optional authentication and
encryption).
SNMPv2
-^^^^^^
+------
SNMPv2 is the original and most commonly used version. For authorizing clients,
SNMP uses the concept of communities. Communities may have authorization set
@@ -88,7 +91,7 @@ router. Note that SNMPv2 also supports no encryption and always sends data in
plain text.
Example
-*******
+^^^^^^^
.. code-block:: none
@@ -116,7 +119,7 @@ Example
SNMPv3
-^^^^^^
+------
SNMPv3 (version 3 of the SNMP protocol) introduced a whole slew of new security
related features that have been missing from the previous versions. Security
@@ -137,60 +140,64 @@ The securityapproach in v3 targets:
* Authentication – to verify that the message is from a valid source.
Example
-*******
-
-.. code-block:: none
+^^^^^^^
- set service snmp v3 engineid '0x0aa0d6c6f450'
- set service snmp v3 group defaultgroup mode 'ro'
- set service snmp v3 group defaultgroup seclevel 'priv'
- set service snmp v3 group defaultgroup view 'defaultview'
- set service snmp v3 view defaultview oid '1'
+* Let SNMP daemon listen only on IP address 192.0.2.1
+* Configure new SNMP user named "vyos" with password "vyos12345678"
+* New user will use SHA/AES for authentication and privacy
- set service snmp v3 user testUser1 auth plaintext-key testUserKey1
- set service snmp v3 user testUser1 auth type 'md5'
- set service snmp v3 user testUser1 engineid '0x0aa0d6c6f450'
- set service snmp v3 user testUser1 group 'defaultgroup'
- set service snmp v3 user testUser1 mode 'ro'
- set service snmp v3 user testUser1 privacy type aes
- set service snmp v3 user testUser1 privacy plaintext-key testUserKey1
-
-After commit the resulting configuration will look like:
+.. code-block:: none
-.. note:: SNMPv3 keys won't we stored in plaintext. On ``commit`` the keys
- will be encrypted and the encrypted key is based on the engineid!
+ set service snmp listen-address 192.0.2.1
+ set service snmp location 'VyOS Datacenter'
+ set service snmp v3 engineid '000000000000000000000002'
+ set service snmp v3 group default mode 'ro'
+ set service snmp v3 group default view 'default'
+ set service snmp v3 user vyos auth plaintext-password 'vyos12345678'
+ set service snmp v3 user vyos auth type 'sha'
+ set service snmp v3 user vyos group 'default'
+ set service snmp v3 user vyos privacy plaintext-password 'vyos12345678'
+ set service snmp v3 user vyos privacy type 'aes'
+ set service snmp v3 view default oid 1
+
+After commit the plaintext passwords will be hashed and stored in your
+configuration. The resulting LCI config will look like:
.. code-block:: none
vyos@vyos# show service snmp
+ listen-address 172.18.254.201 {
+ }
+ location "Wuerzburg, Dr.-Georg-Fuchs-Str. 8"
v3 {
- engineid 0x0aa0d6c6f450
- group defaultgroup {
+ engineid 000000000000000000000002
+ group default {
mode ro
- seclevel priv
- view defaultview
+ view default
}
- user testUser1 {
+ user vyos {
auth {
- encrypted-key 0x3b68d4162c2c817b8e9dfb6f08583e5d
- type md5
+ encrypted-password 4e52fe55fd011c9c51ae2c65f4b78ca93dcafdfe
+ type sha
}
- engineid 0x0aa0d6c6f450
- group defaultgroup
- mode ro
+ group default
privacy {
- encrypted-key 0x3b68d4162c2c817b8e9dfb6f08583e5d
+ encrypted-password 4e52fe55fd011c9c51ae2c65f4b78ca93dcafdfe
type aes
}
}
- view defaultview {
+ view default {
oid 1 {
}
}
}
+You can test the SNMPv3 functionality from any linux based system, just run the
+following command: ``snmpwalk -v 3 -u vyos -a SHA -A vyos12345678 -x AES
+-X vyos12345678 -l authPriv 192.0.2.1 .1``
+
VyOS MIBs
-^^^^^^^^^
+=========
All SNMP MIBs are located in each image of VyOS here: ``/usr/share/snmp/mibs/``
@@ -200,9 +207,8 @@ you are be able to download the files with the a activate ssh service like this
scp -r vyos@your_router:/usr/share/snmp/mibs /your_folder/mibs
-
SNMP Extensions
-^^^^^^^^^^^^^^^
+===============
To extend SNMP agent functionality, custom scripts can be executed every time
the agent is being called. This can be achieved by using
@@ -230,7 +236,7 @@ contain the output of the extension.
NET-SNMP-EXTEND-MIB::nsExtendResult."my-extension" = INTEGER: 0
SolarWinds
-^^^^^^^^^^
+==========
If you happen to use SolarWinds Orion as NMS you can also use the Device
Templates Management. A template for VyOS can be easily imported.
@@ -255,7 +261,6 @@ following content:
</Configuration-Management>
.. _MIB: https://en.wikipedia.org/wiki/Management_information_base
-.. _SNMP: https://en.wikipedia.org/wiki/Simple_Network_Management_Protocol
.. _SNMPv2: https://en.wikipedia.org/wiki/Simple_Network_Management_Protocol#Version_2
.. _SNMPv3: https://en.wikipedia.org/wiki/Simple_Network_Management_Protocol#Version_3