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napatech: auto-config documentation update

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Added documentation describing how to configure suricata to automaticly
configure sreams and host buffers without using NTPL.  I.e. from
suricata.yaml.
pull/3788/head
Phil Young 7 years ago committed by Victor Julien
parent 05271bfbe5
commit 6cfc39d7c9
1 changed files with 235 additions and 113 deletions
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doc/userguide/capture-hardware/napatech.rst
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@ -1,11 +1,8 @@
Napatech Suricata Installation Guide
=============================================================
Napatech
========
Contents
--------
* Introduction
* Package Installation
@ -34,13 +31,10 @@ hardware based features:
* Accurate time synchronization
The Napatech Software Suite (driver package) comes in two varieties, NAC and OEM.
The NAC package distributes deb and rpm packages to ease the installation.
The OEM package uses a proprietary shell script to handle the installation process.
The package uses a proprietary shell script to handle the installation process.
In either case, gcc, make and the kernel header files are required to compile the kernel module and
install the software.
Package Installation
--------------------
@ -48,42 +42,10 @@ Package Installation
*Root privileges are also required*
Napatech NAC Package
^^^^^^^^^^^^^^^^^^^^
Red Hat Based Distros::
$ yum install kernel-devel-$(uname -r) gcc make ncurses-libs
$ yum install nac-pcap-<release>.x86_64.rpm
Some distributions will require you to use the --nogpgcheck option with yum for the NAC Software Suite package file::
$ yum --nogpgcheck install nac-pcap-<release>.x86_64.rpm
Debian Based Distros::
$ apt-get install linux-headers-$(uname .r) gcc make libncurses5
$ dpkg .i nac-pcap_<release>_amd64.deb
To complete installation for all distros stop ntservice::
$ /opt/napatech3/bin/ntstop.sh -m
Remove these existing setup files::
$ cd /opt/napatech3/config
$ rm ntservice.ini setup.ini
Restart ntservice (a new ntservice.ini configuration file will be generated automatically)::
$ /opt/napatech3/bin/ntstart.sh -m
Napatech OEM Package
^^^^^^^^^^^^^^^^^^^^
The latest driver and tools installation package can be downloaded from: https://www.napatech.com/downloads.
*Note that you will be prompted to install the Napatech libpcap library. Answer "yes" if you would like to
use the Napatech card to capture packets in WIreshark, tcpdump, or another pcap based application.
use the Napatech card to capture packets in Wireshark, tcpdump, or another pcap based application.
Libpcap is not needed for Suricata as native Napatech API support is included*
Red Hat Based Distros::
@ -110,105 +72,173 @@ prepare for compilation::
$ make
$ make install-full
Now edit the suricata.yaml file to configure the maximum number of streams to use. If you plan on using the load distribution
(RSS - like) feature in the Napatech accelerator, then the list should contain the same number of streams as host buffers defined in
ntservice.ini::
Suricata configuration
----------------------
Napatech:
# The Host Buffer Allowance for all streams
# (-1 = OFF, 1 - 100 = percentage of the host buffer that can be held back)
hba: -1
Now edit the suricata.yaml file to configure the system. There are three ways
the system can be configured:
# use_all_streams set to "yes" will query the Napatech service for all configured
# streams and listen on all of them. When set to "no" the streams config array
# will be used.
use-all-streams: yes
1. Auto-config without cpu-affinity: In this mode you specify the stream
configuration in suricata.yaml file and allow the threads to
roam freely. This is good for single processor systems where NUMA node
configuration is not a performance concern.
# The streams to listen on
streams: [0, 1, 2, 3, 4, 5, 6, 7]
2. Auto-config with cpu-affinity: In this mode you use the cpu-affinity
of the worker threads to control the creation and configuration of streams.
One stream and one worker thread will be created for each cpu identified in
suricata.yaml. This is best in systems with multiple NUMA nodes (i.e.
multi-processor systems) as the NUMA node of the host buffers is matched
to the core on which the thread is running.
Note: hba is useful only when a stream is shared with another application. When hba is enabled packets will be dropped
(i.e. not delivered to suricata) when the host-buffer utilization reaches the high-water mark indicated by the hba value.
This insures that, should suricata get behind in it's packet processing, the other application will still receive all
of the packets. If this is enabled without another application sharing the stream it will result in sub-optimal packet
buffering.
3. Manual-config (legacy): In this mode the underlying Napatech streams are configured
by issuing NTPL commands prior to running suricata. Suricata then connects
to the existing streams on startup.
Example Configuration - Auto-config without cpu-affinity:
---------------------------------------------------------
If cpu-affinity is not used it is necessary to explicitly define the streams in
the Suricata configuration file. To use this option the following options should
be set in the suricata configuration file:
1. Turn off cpu-affinity
2. Enable the napatech "auto-config" option
Basic Configuration
-------------------
3. Specify the streams that should be created on startup
For the basic installation we will setup the Napatech capture accelerator to merge all physical
ports into single stream that Suricata can read from. for this configuration, Suricata will
handle the packet distribution to multiple threads.
4. Specify the ports that will provide traffic to suricata
Here are the lines that need changing in /opt/napatech3/bin/ntservice.ini for best single buffer performance::
5. Specify the hashmode used to distribute traffic to the streams
Below are the options to set::
threading:
set-cpu-affinity: no
.
.
.
napatech:
auto-config: yes
streams: ["0-3"]
ports: [all]
hashmode: hash5tuplesorted
Now modify ntservice.ini. You also need make sure that you have allocated enough
host buffers in ntservice.ini for the streams. It's a good idea to also set the
TimeSyncReferencePriority. To do this make the following changes to ntservice.ini:
HostBuffersRx = [4,16,-1] # [number of host buffers, Size(MB), NUMA node]
TimeSyncReferencePriority = OSTime # Timestamp clock synchronized to the OS
HostBuffersRx = [1,16,0] # [number of host buffers, Size(MB), NUMA node]
Stop and restart ntservice after making changes to ntservice::
$ /opt/napatech3/bin/ntstop.sh -m
$ /opt/napatech3/bin/ntstart.sh -m
$ /opt/napatech3/bin/ntstop.sh
$ /opt/napatech3/bin/ntstart.sh
Now we need to execute a few NTPL (Napatech Programming Language) commands to complete the setup. Create
a file will the following commands::
Now you are ready to start suricata::
Delete=All # Delete any existing filters
Setup[numaNode=0] = streamid==0 # Set stream ID 0 to NUMA 0
Assign[priority=0; streamid=0]= all # Assign all phisical ports to stream ID 0
$ suricata -c /usr/local/etc/suricata/suricata.yaml --napatech --runmode workers
Next execute those command using the ntpl tool::
Example Configuration - Auto-config with cpu-affinity:
------------------------------------------------------
This option will create a single worker-thread and stream for each CPU defined in the
worker-cpu-set. To use this option make the following changes to suricata.yaml:
1. Turn on cpu-affinity
2. Specify the worker-cpu-set
3. Enable the napatech "auto-config" option
4. Specify the ports that will provide traffic to suricata
5. Specify the hashmode that will be used to control the distribution of
traffic to the different streams/cpus.
When you are done it should look similar to this::
threading:
set-cpu-affinity: yes
cpu-affinity:
management-cpu-set:
cpu: [ 0 ]
receive-cpu-set:
cpu: [ 0 ]
worker-cpu-set:
cpu: [ all ]
.
.
.
napatech:
auto-config: yes
ports: [all]
hashmode: hash5tuplesorted
Prior to running Suricata in this mode you also need to configure a sufficient
number of host buffers on each NUMA node. So, for example, if you have a two
processor server with 32 total cores and you plan to use all of the cores you
will need to allocate 16 host buffers on each NUMA node. It is also desirable
to set the Napatech cards time source to the OS.
To do this make the following changes to ntservice.ini::
$ /opt/napatech3/bin/ntpl -f <my_ntpl_file>
TimeSyncReferencePriority = OSTime # Timestamp clock synchronized to the OS
HostBuffersRx = [16,16,0],[16,16,1] # [number of host buffers, Size(MB), NUMA node]
Stop and restart ntservice after making changes to ntservice::
$ /opt/napatech3/bin/ntstop.sh -m
$ /opt/napatech3/bin/ntstart.sh -m
Now you are ready to start suricata::
$ suricata -c /usr/local/etc/suricata/suricata.yaml --napatech --runmode workers
Advanced Multithreaded Configuration
------------------------------------
Example Configuration - Manual Configuration
--------------------------------------------
For Manual Configuration the Napatech streams are created by running NTPL
commands prior to running Suricata. In this example we will setup the Napatech
capture accelerator to merge all physical ports, and then distribute the merged
traffic to four streams that Suricata will ingest.
Now let's do a more advanced configuration where we will use the load distribution (RSS - like) capability in the
accelerator. We will create 8 streams and setup the accelerator to distribute the load based on a 5 tuple hash.
Increasing buffer size will minimize packet loss only if your CPU cores are fully saturated. Setting the minimum
buffer size (16MB) will gave the best performance (minimize L3 cache hits) if your CPU cores are keeping up.
The steps for this configuration are:
1. Disable the napatech auto-config option in suricata.yaml
2. Specify the streams that suricata is to use in suricata.yaml
3. Create a file with NTPL commands to create the underlying Napatech streams.
*Note that it is extremely important that the NUMA node the host buffers are define in is the same physical CPU
socket that the Napatech accelerator is plugged into*
First suricata.yaml should be configured similar to the following::
First let's modify the ntservice.ini file to increase the number and size of the host buffers::
napatech:
auto-config: no
streams: ["0-3"]
HostBuffersRx = [8,256,0] # [number of host buffers, Size (MB), NUMA node]
Next you need to make sure you have enough host buffers defined in ntservice.ini. As
it's also a good idea to set up the TimeSync. Here are the lines to change::
TimeSyncReferencePriority = OSTime # Timestamp clock synchronized to the OS
HostBuffersRx = [4,16,-1] # [number of host buffers, Size(MB), NUMA node]
Stop and restart ntservice after making changes to ntservice::
$ /opt/napatech3/bin/ntstop.sh -m
$ /opt/napatech3/bin/ntstart.sh -m
$ /opt/napatech3/bin/ntstop.sh
$ /opt/napatech3/bin/ntstart.sh
Now let's assign the streams to host buffers and configure the load distribution. The load distribution will be
setup to support both tunneled and non-tunneled traffic. Create a file that contains the ntpl commands below::
Now that ntservice is running we need to execute a few NTPL (Napatech Programming Language)
commands to complete the setup. Create a file will the following commands::
Delete=All # Delete any existing filters
Setup[numaNode=0] = streamid==0
Setup[numaNode=0] = streamid==1
Setup[numaNode=0] = streamid==2
Setup[numaNode=0] = streamid==3
Setup[numaNode=0] = streamid==4
Setup[numaNode=0] = streamid==5
Setup[numaNode=0] = streamid==6
Setup[numaNode=0] = streamid==7
HashMode[priority=4]=Hash5TupleSorted
Assign[priority=0; streamid=(0..7)]= all
Assign[streamid=(0..3)]= all # Assign all phisical ports to stream ID 0
Next execute those command using the ntpl tool::
$ /opt/napatech3/bin/ntpl -f <my_ntpl_file>
Now you are ready to start Suricata::
Now you are ready to start suricata::
$ suricata -c /usr/local/etc/suricata/suricata.yaml --napatech --runmode workers
It is possible to specify much more elaborate configurations using this option. Simply by
creating the appropriate NTPL file and attaching suricata to the streams.
Counters
--------
@ -228,8 +258,100 @@ In addition to counters host buffer utilization is tracked and logged. This is
debugging. Log messages are output for both Host and On-Board buffers when reach 25, 50, 75
percent of utilization. Corresponding messages are output when utilization decreases.
Debugging:
For debugging configurations it is useful to see what traffic is flowing as well as what streams are
created and receiving traffic. There are two tools in /opt/napatech3/bin that are useful for this:
- monitoring: this tool will, among other things, show what traffic is arriving at the port interfaces.
- profiling: this will show host-buffers, streams and traffic flow to the streams.
If suricata terminates abnormally stream definitions, which are normally removed at shutdown, may remain in effect.
If this happens they can be cleared by issuing the "delete=all" NTPL command as follows::
# /opt/napatech3/bin/ntpl -e "delete=all"
Napatech configuration options:
-------------------------------
These are the Napatech options available in the suricata configuration file::
napatech:
# The Host Buffer Allowance for all streams
# (-1 = OFF, 1 - 100 = percentage of the host buffer that can be held back)
# This may be enabled when sharing streams with another application.
# Otherwise, it should be turned off.
#hba: -1
# When use_all_streams is set to "yes" the initialization code will query
# the Napatech service for all configured streams and listen on all of them.
# When set to "no" the streams config array will be used.
#
# This option necessitates running the appropriate NTPL commands to create
# the desired streams prior to running suricata.
#use-all-streams: no
# The streams to listen on when cpu-affinity or auto-config is disabled.
# This can be either:
# a list of individual streams (e.g. streams: [0,1,2,3])
# or
# a range of streams (e.g. streams: ["0-3"])
#
#streams: ["0-7"]
#
# When auto-config is enabled the streams will be created and assigned to the
# NUMA node where the thread resides automatically. The streams will be created
# according to the number of worker threads specified in the worker cpu set.
# (I.e. the value of threading.cpu-affinity.worker-cpu-set.cpu.)
#
# This option cannot be used simultaneous with "use-all-streams".
#
auto-config: yes
#
# Ports indicates which napatech ports are to be used in auto-config mode.
# these are the port ID's of the ports that will merged prior to the traffic
# being distributed to the streams.
#
# This can be specified in any of the following ways:
#
# a list of individual ports (e.g. ports: [0,1,2,3])
#
# a range of ports (e.g. ports: [0-3])
#
# "all" to indicate that all ports are to be merged together
# (e.g. ports: [all])
#
# This has no effect if auto-config is disabled.
#
ports: [all]
#
# When auto-config is enabled the hashmode specifies the algorithm for
# determining to which stream a given packet is to be delivered.
# This can be any valid Napatech NTPL hashmode command.
#
# The most common hashmode commands are: hash2tuple, hash2tuplesorted,
# hash5tuple, hash5tuplesorted and roundrobin.
#
# See Napatech NTPL documentation other hashmodes and details on their use.
#
# This has no effect if auto-config is disabled.
#
hashmode: hash5tuplesorted
*Note: hba is useful only when a stream is shared with another application. When hba is enabled packets will be dropped
(i.e. not delivered to suricata) when the host-buffer utilization reaches the high-water mark indicated by the hba value.
This insures that, should suricata get behind in it's packet processing, the other application will still receive all
of the packets. If this is enabled without another application sharing the stream it will result in sub-optimal packet
buffering.*
Make sure that there are enough host-buffers declared in ntservice.ini to
accommodate the number of cores/streams being used.
Support
-------
Contact a support engineer at: ntsupport@napatech.com
Napatech Documentation can be found at: https://docs.napatech.com (Click the search icon, with no search text,
to see all documents in the portal.)
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