Waze, the “…world’s largest community-based traffic and navigation app” failed its users in the Santa Cruz, California area during the month of February 2017. These users who depend on Waze to find out traffic conditions and alternate routes were not able to do so. The same was true for Google Maps. For example, when traffic stalled for up to three hours, Waze and Google Maps happily reported that conditions were just fine.
A New York City based start-up company, Confide, offers a text messaging system “with encrypted messages that self-destruct.” You can download the app at getconfide.com
Confide lets its users “discuss sensitive topics, brainstorm ideas or give unfiltered opinions without fear of the Internet’s permanent, digital record and with no copies left behind.” “Messages disappear forever after they are read once, making them as private and secure as the spoken word.”
What a description! Everyone’s dream come true, right? Certainly a perfect app for individuals wanting to communicate about classified information, military plans, or other top secret information.
Cisco Systems recently announced a patch for a vulnerability in Simple Network Management Protocol (SNMP) functions of some Cisco routers. “This vulnerability could allow an authenticated, remote attacker to cause high CPU usage on an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to an incorrect initialized variable. An attacker could exploit this vulnerability by performing SNMP polling on MIBs and using only Interface Index (ifIndex) values. A successful exploit could allow the attacker to increase CPU usage to 99% on an affected device and cause a DoS condition.” 1
Whether or not you have Cisco routers, it is important to execute all the SNMP vulnerability tests in SilverCreek to verify that your SNMP agent is not vulnerable to attacks.
How to Manage Your Network Using SNMP by Marshall T. Rose and Keith McCloghrie
Performance and Fault Management by Paul L. Della Maggiora, Christopher E. Elliott, et. al.
Practical Guide to SNMPv3 and Network Management, A by David Zeltserman
The Building Automation and Control network (BACnet) protocol defines a network communication standard for building control systems to communicate. These building control systems include devices and applications for heating, ventilating, and air-conditioning (HVAC) control, lighting control, access...
Definition: SDN: Software Defined Networks
“SDN Complexity and Reality” by Russ White and Shawn Zandi, was published on page 31 of The Internet Protocol Journal, November 2016 (Volume 19, Number 3). You can download ipj19-3.pdf at http://ipj.dreamhosters.com/.
In the article, White and Zandi, examine the original three crucial elements to the SDN story:
First, SDNs were supposed to remove the intelligence from the distributed control planes and consolidate that intelligence in a centralized controller.
Second, SDNs were supposed to provide a more granular level of control – down to the flow level.
Third, SDNs would enable the network to be programmable…
IWL provides the SilverCreek SNMP Test Suite, Libraries and APIs for engineers to find and fix bugs in their SNMP agent implementations.
Often developers and quality assurance engineers will need to test the SNMP management appli...
The world is an imperfect place. The internet is no exception. The internet has its good days and it has its bad days. Or to be more precise, the internet has its good seconds and its bad seconds.
Blemishes in internet performance arise from many sources.
Real network conditions are rarely static. Real life networks suffer transient conditions – congestion builds up and dissipates, tree branches wave in the wind across radio links, long distance routing paths change, VoIP call trunks are filled with more calls during working hours than during the evening. Even something as small as a person standing near a wi-fi access point can change the carrying capacity of a network.
You’re better off going straight to StackOverflow.com.
That’s the current situation with many technologies, platforms, SDK libraries and command-line interfaces: the documentation is so badly written, or so poorly organized, or so skimpy, that you can safely skip it and just use Stack Overflow as your answer-it-all search engine.
Or, to put it another way, most SDK documentation has a low cache hit rate, which I call a measure of documentation efficiency. If the efficiency is less than about 50%, then you’re better off skipping the docs entirely, and fetching the answer directly from the collective main memory of SO.
And you may have noticed that SDK documentation falls into one of two extremes. Here’s my experience:
The ESP8266 is very popular among the maker set as a platform for experimentation in the realm of Internet of Things (IoT).
Now that we’re reasonably familiar with its capabilities, it’s time we put ESP8266/NodeMCU to test.