Editing Networking

== Networking ==

[https://www.opnfv.org/ Open Platform for NFV (OPNFV)] is a collaborative project under the Linux Foundation that is transforming global networks through open source Network Functions Virtualization (NFV)

[https://osm.etsi.org/ OSM] is delivering an open source Management and Orchestration (MANO) stack aligned with ETSI NFV Information Models. As an community-led community, OSM offers a production-quality MANO stack that meets operators' requirements for commercial NFV deployments.

ETSI, [https://www.etsi.org/technologies/nfv Home of NFV] and their short [https://www.youtube.com/watch?v=Q1Kzu2vyuqs video] explaining NFV.

Wikipedia [https://en.wikipedia.org/wiki/Network_function_virtualization NFV] article

=== Layer 2 Switching ===

[https://community.cisco.com/t5/networking-documents/understanding-span-rspan-and-erspan/ta-p/3144951 Understanding SPAN,RSPAN,and ERSPAN]

== Network Packet Brokers ==

[https://community.fs.com/blog/network-packet-broker-vs-network-tap.html Network Packet Broker vs Network TAP]

== TCP and IP ==

=== Excellent write up on basics of TCP ===
[https://accedian.com/enterprises/blog/diagnose-tcp-connection-setup-issues/ Diagnose TCP connection setup issues]

=== TCP/IP .NET Sockets FAQ ===

Excellent write up on some [http://blog.stephencleary.com/2009/04/tcpip-net-sockets-faq.html TCP/IP information] by Stephen Cleary

[http://blog.stephencleary.com/2009/05/detection-of-half-open-dropped.html Detection of half opened dropped] connections

=== Other resources ===

[https://networklessons.com/cisco/ccie-routing-switching/pppoe-mtu-troubleshooting-cisco-ios/ MTU Troubleshooting Cisco IOS]

[https://forum.networklessons.com/t/difference-between-ip-fragmentation-and-tcp-segmentation/1815 Difference between IP fragments and TCP segmentation]

=== TCP/IP Performance Tuning ===

[https://web.archive.org/web/20151107132003/http://www.psc.edu/index.php/networking/641-tcp-tune Enabling High Performance Data Transfers] notes for users and system administrators who want to maximize TCP/IP performance on their computer systems. 

[https://en.wikipedia.org/wiki/Bandwidth-delay_product bandwidth-delay product], aka "Long Fat Network" (LFN), is the product of a data link's capacity (in bits per second) and its round-trip delay time (in seconds)

[https://en.wikipedia.org/wiki/TCP_window_scale_option  TCP window scale] option is an option to increase the receive window size allowed in Transmission Control Protocol above its former maximum value of 65,535 bytes. This TCP option, along with several others, is defined in IETF RFC 1323 which deals with long fat networks (LFNs).

== Studies ==

[https://digitalcommons.lsu.edu/cgi/viewcontent.cgi?article=3101&context=gradschool_dissertations Study on the Performance of TCP over 10Gbps High Speed Networks]

[https://iopscience.iop.org/article/10.1088/1742-6596/513/1/012042 10 Gbps TCP/IP streams from the FPGA for High Energy Physics]

== Session Initiated Protocol (SIP) ==

[[My SIP notes]]

[https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml SIP parameters] on nicely formatted and ad free site.

[https://www.tutorialspoint.com/session_initiation_protocol/index.htm SIP tutorial]

=== SHAKEN ===

[https://transnexus.com/solutions/stir-and-shaken/understanding-stir-and-shaken Understanding STIR and SHAKEN]

== 3GPP Long Term Evolution (LTE) ==

[http://www.artizanetworks.com/resources/tutorials/sae_tec.html System Architecture Evolution (SAE) and the Evolved Packet Core (EPC)] tutorials

[https://www.cablefree.net/wirelesstechnology/4glte/lte-interfaces/ LTE interfaces]

[http://lteuniversity.com/get_trained/expert_opinion1/b/lpatterson/archive/2013/06/12/cscf-in-volte-the-p-cscf-part-1-of-4.aspx CSCF in VoLTE the P-CSCF part 1 of 4]

== Wireshark and related stuff ==

[https://www.wireshark.org/docs/ Wireshark docs]

[https://www.wireshark.org/docs/man-pages/ Wireshark Manual (man) pages]

[https://www.wireshark.org/docs/man-pages/editcap.html editcap man page]

[https://wiki.wireshark.org/CaptureFilters Capture Filters]

=== Capture filter examples ===

Filter by destination IP address <code>dst host x.x.x.x</code>

Filter by a set of TCP ports <code>tcp port 22 or tcp port 443 or tcp port 8080</code>

Filter by TCP/UPD port <code>port 5060</code>

=== Display filter examples ===

Filter out TCP Keep-Alive and TCP Keep-Alive ACK with this filter:

<code>!(tcp.flags.ack && tcp.len <=1)</code>

Filter by port 442 and remove TCP Keep-Alive and TCP Keep-Alive ACK with this filter:

<code>tcp.port == 443 && !(tcp.flags.ack && tcp.len <= 1)</code>

=== Add custom columns ===

Add TCP length column to Wireshark

[[File:Tcp.len.png|border|TCP length column]]

=== tshark ===
Export from network capture all TCP payloads using a display filter as octet stream (ASCII hex stream)

<pre>tshark -r <file_name> -Y "ip.src==192.168.1.100 && tcp.port==22222" -T fields -e data > output_file_name.txt</pre>

=== Editcap ===

Reference [https://www.wireshark.org/docs/man-pages/editcap.html editcap man] page

Saves only packets whose timestamp is on or after start time. The time is given in the following format YYYY-MM-DD HH:MM:SS.

Example of timestamps after 2018-12-26 00:00:00 using PowerShell:
<pre>& 'C:\Program Files\Wireshark\editcap.exe' -A "2018-12-26 00:00:00" infile outfile</pre>

Example to limit capture file from frame number 890000 to 910000 (inclusive) using PowerShell:

<pre>& 'C:\Program Files\Wireshark\editcap.exe' -r infile.pcap smallerOutFile.pcap 890000-910000</pre>

'''Note: smallerOutFile.pcap in above example will have different frame numbers (counting starts over when you open file).'''

== Gigabit Ethernet ==
=== Throughput ===
Rickard Nobel article on [http://rickardnobel.se/actual-throughput-on-gigabit-ethernet/ actual gigabit ethetnet throughput]

== Cisco ==

[[My Cisco ASA Notes]]

== Juniper ==

[https://www.juniper.net/documentation/en_US/junos/topics/topic-map/security-interface-ds1.html T1/E1 info]

== NetFlow & IPFIX ==

[https://en.wikipedia.org/wiki/NetFlow NetFlow]

[https://en.wikipedia.org/wiki/IP_Flow_Information_Export IP Flow Information Export]

<center>[[Computing | To Computing]]</center>