Musing: Subscription License Economics

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The rise of software licensing in networking changes some of my assumptions about the 5 year cost of ownership of products. Roughly, lets assume that you are buying virtual appliances like firewalls, DNS/DHCP, IDS/IPS, proxy servers and load balancers and that you pay some type of yearly license to use the product. Capital Upfront The legacy […]

Response: I’m Terrified of My New TV

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Smart Televisions are tracking everything you do and sending that data to unknown services: The amount of data this thing collects is staggering. It logs where, when, how, and for how long you use the TV. It sets tracking cookies and beacons designed to detect “when you have viewed particular content or a particular email […]

Response: Cisco Announces Membership of Open Compute Project

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A blog post on the Cisco’s website announces Cisco joins Open Compute Project as a Gold member: To that list, I am pleased to announce that we recently joined the Open Compute Project as a Gold member. The motivation behind our membership is similar to our involvement in the aforementioned open networking projects: we see […]

Tech Notes: Ping Sweep an IP Subnet

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This is my current goto code snippet for using the BASH command line to perform a ping sweep through an IPv4 subnet. for i in `seq 1 255`; do ping -c 1 192.168.1.$i | tr \\n ‘ ‘ | awk ‘/1 received/ {print $2}'; done This script is deliberately simple, only works for /24 subnets but […]

Thoughts of My Day: VCE Always Was An EMC Property

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EMC announced during it’s quarterly results that it was taking a larger position in VCE. VCE was always an EMC asset, co-operation with partners Cisco, Intel and VMware has never been strong and this simply closes out the current chapter.  The end result positions EMC to also be a “IBM style” company with a full […]

Response: HowTo Configure IP Multicast PIM on ECMP| Mellanox Interconnect Community

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Today I spent several hours reading up on PIM Bidirectional for an customer implementation on an ECMP networking. I realise that somewhere inside my head there is a lot of IP Multicast knowledge that hasn’t been lost but it is definitely hiding. I had to re-learn a number of concepts before I started feel confident. […]

Confusing Times in Networking and Cognition Jumps

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I’ve been researching four different and distinct types of networking in the last few weeks. I’m finding that the cognition required to jump between technologies is making my head hurt. Here is a summary of four technology areas that interest me this week. Optical Networking As part of research project I have been getting deep […]

Response: http2 explained

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Been researching HTTP2 protocol on the basis that is will, more or less, be the dominant protocol on the Internet and everywhere else. Aside from the sense of excitement I get from looking at solving old problems, HTTP2 is a huge change for networking and this site has the best explanation I’ve found so far. Check […]

IOS: show tcp vty

On Cisco IOS, this is a very useful command “show tcp vty xx” to show TCP statistics of the VTY session. If you think your terminal is running slow because of packet loss or delay then this command will provide visibility. The other cause is the CPU/Memory running slow if you don’t see any errors on the TCP (as you can see below).