In today's WAN, network administrators need to complement traditional SNMP-based tools with active monitoring. NetBeez lets administrators constantly monitor end-to-end connectivity and performance for every site.
The post Simplifying WAN Complexity With Active Monitoring appeared first on Packet Pushers.
Here he comes to save the day! Serving, protecting, and troubleshooting -- 24-7-365.
This post was written by Marek Vavruša and Jaime Cochran, who found out they were both independently working on the same glibc vulnerability attack vectors at 3am last Tuesday.
A buffer overflow error in GNU libc DNS stub resolver code was announced last week as CVE-2015-7547. While it doesn't have any nickname yet (last year's Ghost was more catchy), it is potentially disastrous as it affects any platform with recent GNU libc—CPEs, load balancers, servers and personal computers alike. The big question is: how exploitable is it in the real world?
It turns out that the only mitigation that works is patching. Please patch your systems now, then come back and read this blog post to understand why attempting to mitigate this attack by limiting DNS response sizes does not work.
But first, patch!
Let's start with the PoC from Google, it uses the first attack vector described in the vulnerability announcement. First, a 2048-byte UDP response forces buffer allocation, then a failure response forces a retry, and finally the last two answers smash the stack.
$ echo "nameserver 127.0.0.1" | sudo tee /etc/resolv.conf
$ sudo python poc. Continue reading
Today we are pleased to announce the release of Galaxy 2.0.1. In this release we fixed a few nagging bugs, improved the UI on the My Roles page, and took steps to make the role import process more reliable.
Here’s a rundown of the issues addressed in this release:
130 - Plural for ‘minutes ago’ is currently ‘minutess ago’
129 - When Travis notifies on a new tag, tag is not imported into Galaxy
126 - Search - make keyword search less fuzzy
123 - Edit role name changes shouldn’t result in broken links
122 - Edit role name changes should be reflected on import roles page
119 - Search on Browse Authors results in 500 error
117 - Duplication in roles list
115 - An error occurred while saving the role: value too long for type character varying(256)
114 - Link to Travis-CI not loading
113 - Move user repository refresh task to separate queue
109 - Role listed multiple (2) times
107 - My Roles not displaying all roles
105 - Users have to refresh browser cache to get new CSS
A look at the vendor-neutral WiFi certifications offered by the Certified Wireless Network Professional program.
Hopes run high for 5G at Mobile World Congress as the industry awaits a standard for the emerging technology.
Everyone talks about public or hybrid clouds, whitebox switching with home-grown networking operating system, or SDN nirvana, but whenever I talk with enterprise-focused architects, consultants or vendor SEs, I see a totally different story.
Here's a typical response I'm getting from engineers in this group: “I work with multinational financial customers, and in this group hybrid cloud is not even a topic. They do private cloud projects, with some of them looking into public cloud deployments of isolated projects on base AWS functionality.”
Read more ...OSPF Area Types – Different Areas in OSPF are used to create smaller fault domains.There are totally two OSPF area types. OSPF Backbone area and OSPF non backbone area. Backbone area in OSPF is Area 0. OSPF prevents loop by using backbone area concept.All the non-backbone areas should be connected to the Backbone area. There are […]
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OSPF Area Types – Different Areas in OSPF are used to create smaller fault domains. There are two OSPF area types in total. OSPF Backbone area and OSPF non-backbone area Backbone area in OSPF is Area 0. OSPF prevents loop by using backbone area concept.All the non-backbone areas should be connected to the Backbone area. There […]
The post OSPF Area Types appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
OSPF Area Types – Different Areas in OSPF are used to create smaller fault domains. There are two OSPF area types in total. OSPF Backbone area and OSPF non-backbone area Backbone area in OSPF is Area 0. OSPF prevents loop by using backbone area concept.All the non-backbone areas should be connected to the Backbone area. There […]
The post OSPF Area Types appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net/newwp.
Today, Pica8 announced support for Table Type Patterns (TTP) in PicOS, our leading SDN operating system. The premise of this announcement is that with TTP, network engineers and operators can now implement SDN at greater scale – in some cases, up to two million flows (a 1,000x increase from previous methodologies) – while still using standard, white box hardware.
The magic of the technology is how PicOS can seamlessly leverage the capabilities of different switch ASICs. This empowers users with greater choice, and enables them to take advantage of unique capabilities of the ASIC they choose – such as memory space, programmable pipelines, and table management.
In terms of how we achieve greater flow scale with TTP, it’s similar to what I wrote about OpenFlow scale last year: all tables within the ASIC (VLAN, MAC, IP, TCAM, etc) are exposed and can be programmed via OpenFlow. But what’s more interesting is how we are seeing customers put this functionality to use.
Example 1: Cloud Brokering
For ISPs, automation and self-service portals are nirvana for the reduction in OpEx alone. If a customer wants to increase their bandwidth from 10Mbps to 100Gbps, but only wants to do it from Continue reading
OpenDaylight (ODL) is a popular open-source SDN controller framework. To learn more about OpenDaylight, it is helpful to use it to manage an emulated network of virtual switches and virtual hosts. Most people use the Mininet network emulator to create a virtual SDN network for OpenDaylight to control.
In this post, I will show how to set up OpenDaylight to control an emulated Mininet network using OpenFlow 1.3. Because I am using virtual machines, the procedure I use will work the same in all commonly used host systems: Linux, Windows, and Mac OS X.
In this lab example, I will use two virtual machines. One will run the Mininet emulated network and the other will run the OpenDaylight controller. I will connect both VMs to a host-only network so they can communicate with each other and with programs running on the host computer, such as ssh and the X11 client.
I will use VirtualBox to run the Mininet VM that I downloaded from the mininet project web site, which is the easiest way to experiment with Mininet. The Mininet project team provides an Ubuntu 14.04 LTS VM image with Mininet 2.2.1, Wireshark Continue reading
Last time I wrote about drawing L3-diagrams. Since then, I have been planning to write generally about drawing techniques. This blog post will cover some useful layouts as well as MS Visio tips for network engineers. I think MS Visio is not quite optimal for network diagrams and is lacking some key features from network diagramming […]
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