Making JSON more Readable with Sublime Text
I saw Scott Lowe’s post on how he is making JSON more readable in BBEdit and I thought I’d share how I’m doing this in Sublime Text.
If you aren’t using Package Control, you should be, so install it using the instructions here.
Open the prompt with ^⌘P then type Install and press Enter Then type
Pretty JSON and press enter on more time.
Then to make your JSON pretty, you can simply ^⌘J or ^⌘P and type
pretty
Making JSON more Readable with Sublime Text
I saw Scott Lowe’s post on how he is making JSON more readable in BBEdit and I thought I’d share how I’m doing this in Sublime Text.
F5 Networks iRule Event Order – HTTP
I hit an issue recently where I thought I knew what was what but found myself doubting my knowledge. To that end, here’s a diagram detailing the iRule event order where HTTP traffic is concerned – I’ll follow up shortly with one for HTTPS flows. I’d be grateful to any F5’ers out there that can […]
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The post F5 Networks iRule Event Order – HTTP appeared first on Packet Pushers Podcast and was written by Steven Iveson.
ACI Launch
Tech Field Day brought me to the Cisco Application Centric Infrastructure launch event last week in New York. I attended at someone else's expense, but that doesn't mean my opinions are for sale, etc...If you're totally unfamiliar with ACI (formerly Insieme), I recommend listening to Episode 12 of the Class C Block podcast with guest Joe Onisick. This was far more informative than anything I encountered at the actual launch event, probably because the Tech Field Day crew went straight from the John Chambers presentation into a room where we recorded a roundtable discussion. There may have been some technical discussion going on next door, but I missed it.
There's no shortage of people expressing opinions about ACI and what it will or won't do for you, most of whom have beaten me to the punch by several days. I'm going to post instead about a few details of the launch that I found interesting.
Defining Policy Might Not Be Easy
ACI requires that applications (really application owners) express to it the relationships between nodes before any traffic is allowed to flow. There are countless ways this might happen, but they all boil down to figuring out which ports Continue reading
On IPSec complexity – maybe AWS VPC’s IPSec will emerge as a de-facto standard
Here is a delayed reaction to the posts about IPSec complexity by Jason Edelman and Ivan Pepelnjak last month. AWS might give us decent IPSec ‘standard’ to rally around. There has been plenty of discussion of the past few years about whether it’s a good idea for providers and orchestration stacks to adopt the AWS APIs. There’s no need to […]
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The post On IPSec complexity – maybe AWS VPC’s IPSec will emerge as a de-facto standard appeared first on Packet Pushers Podcast and was written by Nik Weidenbacher.
Show 167 – Cisco ACI Software Defined Networking – A First Look
Ethan and Greg got together to talk over the Cisco Application Centric Infrastructure (ACI) announcement this week. From the information that we have available to us, we look at some of the early concepts and technology that we know about. 40 GB BiDir optics and what it means for data centre design Nexus 9000 hardware […]
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The post Show 167 – Cisco ACI Software Defined Networking – A First Look appeared first on Packet Pushers Podcast and was written by Greg Ferro.
Packet Design CTO to Discuss SDN Management Challenges
Session to cover need for route analytics to facilitate SDN across wide area networks
SANTA CLARA, Calif. – Nov. 11, 2013 – Packet Design CTO Cengiz Alaettinoglu will conduct a technical session during the 16th annual MPLS/SDN 2013 International Conference about how route analytics can address software defined networking (SDN) management challenges. Specifically, he will introduce the need for a network access broker to verify if the wide area network (WAN) can handle the traffic demands of SDN applications without impacting other applications adversely.
Session Title: “Challenges in Operating a Software Defined Network: How Route Analytics Alleviates the Risks”
Session Description: Northbound SDN APIs allow creation of network-aware applications. Cloud and data center applications have successfully taken advantage of these APIs to provide seamless virtual machine mobility and elasticity. However, these applications are unaware of whether or not the underlying WAN can provide acceptable performance.
Technology vendors have toyed with bandwidth on demand, demand placement and rapid provisioning as SDN applications for carriers. The ability to provide performance guarantees for these applications as well as cloud applications requires deep understanding of underlying real-time network topology and traffic demands. Route analytics is the state-of-the-art-technology needed to provide this information.
In this presentation, Cengiz will Continue reading
Cisco ACI: As The Dust Settles
So, the industry is sufficiently abuzz about the Cisco ACI launch last week, and the stats on my introductory series I wrote tells me that, like it or not, this is having a pretty big impact. The focus on the application is clearly the right approach - all of this talk about SDN and network virtualization is taking place because the current network model’s complexity results in bad kluges and long provisioning times, and the applications folks are always waiting on the network to respond.Making JSON more Readable with Sublime Text
I saw Scott Lowe’s post on how he is making JSON more readable in BBEdit and I thought I’d share how I’m doing this in Sublime Text.
Cisco ACI: As The Dust Settles
So, the industry is sufficiently abuzz about the Cisco ACI launch last week, and the stats on my introductory series I wrote tells me that, like it or not, this is having a pretty big impact. The focus on the application is clearly the right approach - all of this talk about SDN and network virtualization is taking place because the current network model’s complexity results in bad kluges and long provisioning times, and the applications folks are always waiting on the network to respond.Install Open vSwitch v2 from Source on Red Hat Fedora 19
This is a walk through for installing Open vSwitch v2.0+ on RedHat Fedora 19 from source. If you want to build Open vSwitch from RPM binaries please see this post There are some new OVS tables included in the latest builds that include some neat concepts. OVS is often regarded as the SDN reference data plane implementation in the early ......
Who Uses Google’s DNS?
Much has been said about how Google uses the services they provide, including their mail service, their office productivity tools, file storage and similar services, as a means of gathering an accurate profile of each individual user of their services. The company has made a very successful business out of measuring users, and selling those metrics to advertisers. But can we measure Google as they undertake this activity? How many users avail themselves of their services? Perhaps that's a little ambitious at this stage, so maybe a slightly smaller scale may be better, so let's just look at one Google service. Can we measure how many folk use Google's Public DNS Service?Handy Tshark Expressions
Tshark is the CLI version of Wireshark, and it's amazing. I'm going to start collecting some of my favorite tshark one-liners here. Check back often.Find All Unique Filenames Referenced in SMB2
tshark -r file.pcap -Tfields -e ip.src -e ip.dst -e text smb2 | grep -oP "GUID handle File: .*?," | sort | uniq | awk -F: '{print $2}' | sed 's/,//'
Notes:
You don't actually need to include the ip.src and ip.dst fields, since they're not extracted by the grep command. I include them in case I want to do an ad-hoc grep for an IP address during the analysis process. Another way to do the same thing would be to modify the display filter to look only for certain addresses, e.g.:
tshark -r file.pcap -Tfields -e text smb2 and ip.addr==1.1.1.1 | grep -oP "GUID handle File: .*?," | sort | uniq | awk -F: '{print $2}' | sed 's/,//'
IETF 88 Technical Plenary
This is a long video, but you need to watch it. I’ll have a couple of longer reports on IETF 88 in the coming weeks, as I get the chance to write stuff up. Edit: For anyone who’s interested in this topic specifically, please join the perpass IETF mailing list.
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Packet capture in Cisco IOS
How does the internet work - We know what is networking
This will be a brief article but a good one. It will save you some walking time to server room. I have the need to capture traffic on the switch or on the router several times every week. That action needed from me to be physically near the switch and to configure SPAN port so that I can […]
Build a 48-port switch using a 24-port ASIC
Modern top-of-rack switches (or TORs) run at line rate and are non-oversubscribed. This means you get non-blocking [1] port-to-port throughput within the switch ASIC at the line rate of the front panel ports. Almost all TOR switches use a single switch … Continue reading
The post Build a 48-port switch using a 24-port ASIC appeared first on The Network Sherpa.
Show 166 – SDN Controller Strategies
We know that networking for last few months is all about SDN Unicorns and other Applications. This week we are joined by Mike Dvorkin and Brent Salisbury to talk about the science of building SDN controller application. It's not easy to decide how to build a model that allows for business policy to map onto flow management, virtual server and physical devices so we gathered in the virtual boardroom to discuss the fundamental nature of SDN Controller and basic concepts of what you want to build and why.
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The post Show 166 – SDN Controller Strategies appeared first on Packet Pushers Podcast and was written by Greg Ferro.
Evolving the data center network core
As complex functions that were historically shoehorned into the network core move out to the edge where they belong, data center core network operators can now focus on improving the experience for the different types of applications that share the network. Furthermore, with fewer vertically scaled systems giving way to many horizontally scaled systems, the economics of data center bandwidth and connectivity needs to change.
I’ve jotted down some thoughts for improving the data center core network along the lines of adding bandwidth, managing congestion and keeping costs down.
Solve bandwidth problems with more bandwidth
Adding bandwidth had been a challenge for the last several years owing to the Ethernet industry not being able to maintain the historical Ethernet uplink:downlink speedup of 10:1, and at the same time not bringing down the cost of Ethernet optics fast enough. Big web companies started to solve the uplink bandwidth speed problem in the same way they had solved the application scaling problem -- scale uplinks horizontally. In their approach, the role of traditional bridging is limited to the edge switch (if used at all), and load-balancing to the edge is done using simple IP ECMP across a “fabric” topology. The number Continue reading