I want to simulate OpenFlow to check its performance and efficiency in certain framework. How can I do that without using actual openflow enabled switches?
You can use Mininet, it's a openflow network prototyping tool that used openVSwitch. Mininet allows you to create large network topologies and simulate traffic.
To do performance testing or in general research in Software Defined Networking field you have several options for network simulator & emulator:
1) Mininet (Emulator; Learning curve: Easy; Open source)
2) Estinet (Simulator & Emulator; Learning curve: Moderate; Proprietary)
3) ns-3 (Simulator; Learning curve: Difficult; Open source)
Mininet, as mentioned should be your best shot. http://mininet.github.com/
Its strong points are:
active development
very active mailing list
preconfigured Ubuntu VM available
supports other distributions, too
Go vote on the area 51 proposal to make it a stackexchange site!!! http://area51.stackexchange.com/proposals/44914/openflow
I am in the process of building a Mininet installer for Fedora. It installs on a full install, once I get it to run completely and on a minimal install I will ask it to be forged back into mininet's trunk.
Related
Is there any GPON (gigabit-capable passive optical network) simulation model available for OMNET++? or is there any other alternate free simulator ?
A basic implementation of (1G) Ethernet Passive Optical Network (EPON) for OMNeT++ 4.1 ( an older version, latest version being OMNET++ 6) is available. For more details check the EPON project page.
https://omnetpp.org/download-items/EPON.html
Other simulators:
From sourceforge page I did find
XG-PON module for the NS-3 network simulator. This module is designed and implemented with aim to provide a standards-compliant, configurable, and extensible module that can simulate XG-PON with reasonable speed and can support a wide range of research topics.
Like OMNET++, NS3 is also a widely used network simulator.
I'm trying to learn network protocol stack(ie. Transport, IP, datalink layer library code implementation) along with linux. I'm confused where to start.
First question is whether these codes come as in-built features of linux kernel/above library layers.
If so why I can see 3rd party protocol stack in some applications (by blunk micro system - developer of protocol stack)
If Linux doesn't have it as core feature, is linux give only placeholders for network part(like just Macros to enable the 3rd party stack ). But an article says it has Net4 networking codebase.
If linux has in-built network features what are the linux modules I need to go through or where to start? Not only in the network perspective, if i'm guided to explore in linux in all aspects (process, memory, drivers) in the "code level", it would be helpful please.
Note: I'm greedy to write my own OS and protocol stack hence trying to understand an existing system.
Thanks in advance!
First question is whether these codes come as in-built features of linux kernel/above library layers.
Linux kernel has network stack up to including layer 4, i.e., TCP and UDP (well, kernel + a set of utilities needed to configure it). I think DNS is in kernel too, but I am not so sure. TLS used to be implemended as a library (OpenSSL and GnuTLS are I think the most common ones), but there seems to be kernel part too now (link.
Note, that some of the TCP functionality is offloaded to the network card (hardware). At high speeds (1Gb+) you won't get full performance without these features.
I am not familiar with all VoIP related protocols, but I think they are libraries, not kernel.
If so why I can see 3rd party protocol stack in some applications (by blunk micro system - developer of protocol stack)
I believe the reason is performance. If you implement a custom stack with a subset of features, it might work better for your applications. Also there are advanced features and protocols that might not be available in the kernel itself.
If Linux doesn't have it as core feature, is linux give only placeholders for network part(like just Macros to enable the 3rd party stack ). But an article says it has Net4 networking codebase.
there is a very large codebase
If linux has in-built network features what are the linux modules I need to go through or where to start? Not only in the network perspective, if i'm guided to explore in linux in all aspects (process, memory, drivers) in the "code level", it would be helpful please.
hmmm, this is a very good question, and I don't think there is an easy answer. In my experience reading the code is the only way to figure this out. However some people tried to fish LWN.net for information.
you could probably start somewhere here: include/net/
First question is whether these codes come as in-built features of linux kernel/above library layers.
If linux has in-built network features what are the linux modules I need to go through or where to start?
You can think of a protocol stack as of a library. Linux kernel has one which runs inside the kernel address space and uses kernel APIs unavailable in user-space: https://github.com/torvalds/linux/tree/master/net/ipv4
There are multiple in-depth books about Linux kernel networking. Reading one is required for good understanding.
If so why I can see 3rd party protocol stack in some applications (by blunk micro system - developer of protocol stack)
Zero-copy, low-latency and streaming (processing an Ethernet packet in CPU-L1-cache-line-sized chunks while it hasn't been read off the wire in full) networking have been problematic with Linux kernel network stack. For these reasons makers of networking hardware offered their own user-space network stacks, aka kernel bypass.
Linux kernel network stack is getting better these days with MSG_ZEROCOPY and io_uring.
I am new to GNS3 and Cisco's Packet Tracer. Besides using GNS3 to simulate complex networks, practice using it for the CCNA exam, and using Dynamips emulation software to simulate Cisco IOS, how is it used in the real world by big companies and corporations? Thanks.
It can also be used for documentation of the networks topology,Top Level Structure, IP address distribution and much more.
It' used for testing complex network configuration like firewall rules or SDN configuration.
You can use it to train on the firewall and servers and connect it to vmware, and also create large projects on the GNS3 and put it in the CV if you haven't experience
It can also be used to test how a network will behave by installing actual Operating system images and a sniffer. Basically it can be used to mimic the actual scenario with the proper resources.
I'm currently building a network monitoring system that will notify me if any interface errors or network issues. after building it we would like to be able to test if it works before implementing it to our network, so need a way of simulating network interface errors on a switch or networking device?
I was thinking about cutting ethernet cables or terminating them wrong, but ideally I need soemthing that can create loads of different types of interface errors
any help would be much appreciated
Sean
You could download Nagios which is a powerful, enterprise-class host, service, application, and network monitoring program. Designed to be fast, flexible, and rock-solid stable. Nagios runs on *NIX hosts and can monitor Windows, Linux/Unix/BSD, Netware, and network devices.
you can download other network monitoring systems from sourceforge they have many different network tools written in different languages most of them are open source. you can take notes of their
design and maybe add to the application you building.
if you want to test your application the best thing to do is to tested on real environment, I believe their might be one or two Virtual Lab.
But Ideally I would tested on real interfaces
One of the ways to simulate network failures would be to dynamically change the firewall settings. You can make packets drop, hosts, disappear, etc. This doesn't require any physical damage to anything :)
I'm working as a student-intern in a govt organization to complete my major-project at college.
My task is to simulate a dynamic-routing protocol for ad-hoc networks. As I've good programming experience in C++ thus I've chosen OMNET++ network simulator.
It was easy to adapt to the working environment and I could play around with the samples provide in OMNET IDE.
Problem Statement:
Now, I need to start working on my task i.e. [ http://www.mediafire.com/?s5ajo8gavhcf6sr ] pls have a look at the paper.
Could someone please give me a few general instructions on building an adhoc network model in omnet and then apply a routing protocol to it.
I would really appreciate if you could just read the abstract of that paper and provide me deeper insights if possible.
Unfortunately your uploaded file is deleted.
So I would suggest to use the INETMANET framework for simulating adhoc network.
There are Manet routing protocols like AODV
You have there Wifi b,g and also 802.15.4 link layers
And there are modules for the whole TCP/IP stack.