I'm planning to build a network visualization tool for open thread networks. Does anyone know a way to use wpanctl to get all the nodes and hops under the current network?
By design, no Thread device maintains state about all devices within its Thread network. As a result, wpanctl does not provide a single command to provide a listing of all nodes in the network.
What you can do is get a listing of neighboring devices using the following command:
wpanctl get thread:NeighborTable
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I have a created two different virtual interfaces by using iw utility commands "iw wlan0 interface add p2p0 type managed", i can able to create and configured as SoftAP using hostapd. We can make it that interfaces up and we can able to get the beacon frame also. if do manual hardware reboot sometime the SoftAP name is not discovering in the WIFI scan list but the beacon frame data received in sniffer logs.
If you guys have an idea please suggest to solve this issue.
I have a question regarding how to enable Multihop in LoRa (that is to communicate between two end devices without the LoRaWAN gateway). I have tried doing it using transparent bridging but it won't work.
Although it works with LoRaBlink the issue is flooding. If the number of devices increases the channel utilization as well as the performance goes down rapidly.
Can someone please suggest if there is any other way to do it or how to do it efficiently through LoRaBlink?
Thanks
If you check the wiki of Radiohead library, you will find RHRouter and RHMesh under topic Managers with the following description:
RHRouter Multi-hop delivery of RHReliableDatagrams from source node to destination node via 0 or more intermediate nodes, with manual, pre-programmed routing.
RHMesh Multi-hop delivery of RHReliableDatagrams with automatic route discovery and rediscovery.
There are raw LoRa libraries for a mesh network. It's implemented on the Pycom devices, and the library for it is called PyMesh. The technology is based on Thread by Thread groop.
I am new with the NFV+SDN technologies. I have downloaded the OpenDayLight and cloudstack. I have mininet network as underlying physical topology. I want to set up a multi cloud that must contain cloudstack and another IAAS technology, and finally manage the interconnection of resources created on these clouds. I already integrated opendaylight with cloudstack but still don't have a clear image on how to start.
My confusions are:
which technology can guide me to realize a multi-cloud, NFV or SDN? Also is the opendaylight the solution for this? Or there are other frameworks or projects that can help me better.
I shall be grateful to you for any information that could get me started on this project.
It depends on what you want to achieve.
OpenDayLight already supports inter-domain routing through BGP, hence having two OpenDayLight talking to each other through BGP will allow you to get L3 (IP based) traffic back-n-forth which is going to be sufficient to interconnect L3-as-a-Service tenants between the two cloud systems.
BGP (as it is today in ODL) will not cut it for L2-as-a-Service or complex multi-cloud deployments. To achieve connectivity across cloud-domains for L2aaS / Complex-tenants, you will need to
Control Plane: An extension to East-West signaling between SDNc of each cloud to handle L2aaS service requirements (OpenDayLight supports multiple options here)
Data Plane:
A cloud fabric that can carry L2aaS (you don't want to lose the L2aaS identifiers when you move from one domain to the other domain).
An anchor node (ex. DC-GW) to get SDNc to configure the data-plane L2 fabric cross-connects (through interfaces such as OVSDB, ML2 or other).
The above two bullets are not trivial work and don't expect them to be done without some customization. Not to mention that the DC-GW vendor compatibility with ODL (ML2 plugin capabilities) will define a lot of what can and can't be done.
Final point, there are a couple of companies building their SDN go-to-market around the above problem you are trying to fix (Cisco, Arista, Nokia, Ericsson ...etc.). Keep us posted with the progress you are making on that front; you may end up putting a foundation for a new framework in the industry.
I encountered such situation with one master student three years ago. She was trying to do intra-cloud computing work, where there are many resources from two or more providers needed to be managed or outsourced.
She was working on Open nebula.
To answer you on your specific questions, SDN is a network controller no more!
it responsible for installing the path in underlying switches so two hosts can communicate to each other.
NFV is responsible to manage network functions installed in the network. They could be integrated into SDN or only in a simple cloud computing Environment.
As you can see, there are nothing for both of them to help you inter connects two cloud computing environments. They only responsible to manage network component.
YOu can provide us more information about the requirements you are trying to implement.
My objective is to create multiple link/channels to connect with different wifi nodes surrounding it. In the example "wifi-simple-adhoc-grid", only one channel per wifi node is created. How can I extend this to multiple channels?
There are two options:
install multiple NetDevices. This configuration is known as
multi-radio scenario.
have a look at the WAVE module that has
support for multi-channel, implementing the IEEE 1609.4. This
installs single radio with multi-channel.
I am using ryu controller (3.22) to monitor switches (Open vSwitch 2.0.2, supporting Open Flow 1.3), which are a part of virtual network created using mininet (2.1.0). It is a tree topology with depth = 2, and fanout = 5. I am using switch_monitor.py
With the help of controller, I can get port statistics using the EventOFPPortStatsReply decorator. I can get values of rx_packets, rx_bytes, rx_errors, tx_packets, tx_bytes, tx_errors, rx_dropped, tx_dropped etc.
But the values of rx_dropped, tx_dropped come out to be zero always, even when the switches are actually dropping packets, as reported by qdisc (linux command).
How to get packet loss statistics from an Open Flow switch?
a. How to get a non zero value?
b. Is there any alternate way?
qdisc reports what the kernel is dropping, not what the network is dropping. You're getting zero's because the switch isn't dropping frames.
(I don't know if your virtual network system supports simulating frame drops.)
I believe that dropped only cares about packets that are dropped due to actual drop rules or due to buffer overflows.
Another way to calculate packet loss is to compare the packet counts for the two switches on the edge of a link. Suppose you have A <--> B and want to calculate the packet loss rate from A to B. Then you take:
plr(A,B) = (tx_packets(A) - rx_packets(B)) / tx_packets(A))
Beware though that sometimes the counters are reset leading to rx_packets being higher that tx_packets. I am facing this behavior in my SDN software and tend to invalidate the results, if there are strange combinations.