In an earlier blog post, I discussed the issues associated with IPv6 packet fragmentation. Of particular significance, IPv6 fragmentation relies extensively on the computer sourcing packets being able to receive ICMPv6 “packet too big” message type 2 sent from any intermediate device in the route to the packet’s destination.
The capability to confirm that an end user in a network will correctly receive the packet-too-big ICMPv6 message has been added to the test-ipv6 mirrors, including http://test-ipv6.arbor.net. This new capability allows a user to identify if the packet-too-big message is being discarded between the user’s computer and the web site.
In the “Tests Run” tab of the main test-ipv6 mirror page, the “Test IPv6 large packet” test documents the IPv6 fragmentation behavior. If further information is desired, one can click on the “Technical Info” link.
If the “Test IPv6 large packet” test is failing, the packet-too-big ICMPv6 message is likely being dropped. This indicates issues within the user’s computer, enterprise network or elsewhere along the path to the test-ipv6 mirror. The problematic device may be a router or firewall device, although it may even be the “firewall” software configured on the user’s computer.
Any device in the Continue reading
Would you like to be a member of Computer Networking Forum which has many senior level network designer hanging out. It would be nice , right ? I have received [CONTINUE READING]
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I'll be live blogging from ONUG for this fall 2015 session. I'm in Manhattan already, looking forward to the event that starts on Wednesday. Refresh this page periodically to see the latest updates as I glean technical data from the presentations in real-time.
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A Cisco router on a Juniper box? Blasphemy!
Interesting observation about Japan of the day: when you press the elevator call button, the light over the elevator that will be coming next lights up. When the elevator comes, the light flashes as the doors open. Minor thing, I know, but I’m easily amused. Today I went to the SPRING, or source packet routing […]
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I'm in New York City this week to live blog the Open Networking User Group (ONUG) Fall 2015 conference and cover a Tech Field Day Extra.
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I will be presenting at the Cisco Connect Canada tour in Edmonton and Calgary on November 3rd and 5th, respectively. My presentation is about that three letter acronym that everyone loves to hate: SDN :-)
I will talk about SDN in general terms and describe what it really means; what we’re really doing in the network when we say that it’s “software defined”. No unicorns or fairy tales here, just engineering.
Next I’ll talk about three areas where Cisco is introducing programmability into its data center solutions:
Below are the notes I made for myself while researching these topics and preparing for the presentation. At the bottom of this post is a Q&A section with some frequently asked questions.
This vendor-written tech primer has been edited by Network World to eliminate product promotion, but readers should note it will likely favor the submitter’s approach.
The cost and scalability benefits of cloud computing are appealing, but cloud applications are complex. This is because they typically have multiple tiers and components that utilize numerous technologies; as a result, applications can end up scattered across a variety of execution environments. To ensure successful cloud application deployment and management, the key is to use application-defined automation tools.
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It’s Thursday, it’s 9am and…straight in to sessions. No keynote today, which is no bad thing considering these days are long!
The previous two days have consumed a huge amount of hours from sessions, keynotes and side meetings, some planned and some impromptu. This event really is the place to be if you want to speak to industry figure heads representing both vendors and consumers.
It was great to wander the market place hall, with some stands really paying attention to their interpreted understanding of the enterprises and their desire to access the OpenStack technology. This ranged from companies providing optimised tower (desktop style) servers, through to IBM showing off OCP blueprinted servers, which in turn provides a standard compute architecture. Not everyone company or organisation has a server room that wants to take advantage of OpenStack, nor do they necessarily have the skill to tie the components together. Interesting approaches all round!
Miranits, Canonical and Red Hat were present, for each tip of the consumer triangle, being: instant access, guided automation and tool-box.
Mirantis offer the easy access approach, or ‘low bar’ if that’s more familiar as an ‘easy’ term. As a set of steps: Install Continue reading