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Questions tagged [sdn]

Software-defined networking (SDN)

Software-defined networking (SDN) is an approach to computer networking which evolved from work done at UC Berkeley and Stanford University around 2008. SDN allows network administrators to manage network services through abstraction of lower level functionality. This is done by decoupling the system that makes decisions about where traffic is sent (the control plane) from the underlying systems that forward traffic to the selected destination (the data plane). (source)

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Kubernetes Pod communication across nodes, How does it work?

I have been studying how kubernetes pod communication works across nodes and here is my intake so far: Basically, the following figure describes. how each pod has network interface eth0 that is linked to the veth and than bridged to the hosts eth0…
Ezwig
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How to log all flow table entries periodically in mininet by Python code?

In my understanding, dpctl dump-flows command only helps to view current state of flow table. Flow table gets flushed often. I want to record the flow table entries. Which class do I need to look into to record flow table? I am using POX controller…
Sangeetha Sangeetha
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How to add flow table on each two switches? (mininet)

I set topology as can seen in the image below. I want to add different flow-tables to each switch. But if I type dpctl add-flow in_port=1,nw_dst=10.0.0.2,actions=output:3 the flow table is added to both s1 and s2! How can I add a different…
Jungwon
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Not able to install the GUI package(odl-dlux-all) related to OpenDaylight Carbon version

I am not able to install the package odl-dlux-all on the Ubuntu 16.04 machine. Following is the error message Error executing command: Can't install feature odl-dlux-all/0.0.0: null VM : Ubuntu 16.04 Opendaylight version : Carbon What is the…
Prashant
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Dual activation of both WiFi and Cellular Network Interface at the same time

On Android, when both WiFi and Cellular Network are available, WiFi has higher priority and cellular network will be deactivated automatically. This can be verified by the results of ifconfig/netcfg commands, also possible by checking the route…
Max Li
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mininet simulation without controller and with

Whats the difference between using mininet simulation without controller and with controller? Whats the point to use simulation without controller? Sorry for noob question. Many thanks,
Boruncik
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Ryu Controller Drop Packet

How do I send a flow entry to drop a package using Ryu? I've learned from tutorials how to send package out flow entry: I define the action: actions = [ofp_parser.OFPActionOutput(ofp.OFPP_FLOOD)] Then the entry itself: out =…
HSC
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Difference between instructions and actions in OpenFlow

In OpenFlow protocol we have a flow table (or multiple flow tables). Each flow table in the switich contains a set of flow entries. Each flow entry contains header fields, counters and a set of instructions or actions to be applied. Instrucions are…
Filip Kowalski
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connecting open vswitch with two virtual machines

I'm running an Open VSwitch on a VirtualBox VM, i want to connect 2 VMs that are running on VirtualBox into OpenVswitch. i did these things: 1)first i made an VM running ubuntu (lubuntu), and installed ovs using the following command sudo apt-get…
pouya
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move hosts dynamically in mininet

How to dynamically move hosts in mininet? Any CLI commands or a script? I tried the code at https://github.com/mininet/mininet/blob/master/examples/mobility.py but I get this error: anusha@anusha-Lenovo-IdeaPad-Z500:~$ sudo python…
Anusha
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ImportError: No module named oslo_config.cfg - Ryu App

I am running a sample Ryu application as outlined here: https://ryu-zhdoc.readthedocs.org/en/latest/writing_ryu_app.html But I am getting the following error: Traceback (most recent call last): File "/usr/local/bin/ryu-manager", line 9, in…
alamba
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Unable to compile swig generated wrapper for c++ python extension

Hi I am trying the swig python extension, in c++, example - on an Mit page My header is - shapes.h #include class Shape { public: Shape() { nshapes++; } ~Shape() { nshapes--; } double x,…
Ankit Mishra
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How to execute a python program in Mininet environment in multiple xterm windows simultaneously?

I have a python program (mypro.py) in which i want to run on all the hosts of my topology simultaneously (i.e., without going to each xtrem window and typing python mypro.py). Is there a way to do that on the xterm of Mininet environment by using a…
OiaSam
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Mininet - Can a host be connected to two switches?

I have implemented the following topology in Python: from mininet.topo import Topo class internTopo(Topo): def build(self): h1 = self.addHost('h1') h2 = self.addHost('h2') h3 = self.addHost('h3') s1 =…
Ziad Ismaili Alaoui
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ovs-ofctl add a flow to allow only ARP ethernet frames

I am starting to learn SDN with ovs-ofctl and mininet, and I am configuring a switch following some tutorials, but there's something I don't catch. When I start my topology with: sudo mn --topo single,2 --controller remote --switch ovsk Now if I…
juan carlos
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