As opposed to the public telephone network, the internet has a Packet Switched design. But just how big can these packets be?
CC BY 2.0 image by ajmexico, inspired by
This is an old question and the IPv4 RFCs answer it pretty clearly. The idea was to split the problem into two separate concerns:
What is the maximum packet size that can be handled by operating systems on both ends?
What is the maximum permitted datagram size that can be safely pushed through the physical connections between the hosts?
When a packet is too big for a physical link, an intermediate router might chop it into multiple smaller datagrams in order to make it fit. This process is called "forward" IP fragmentation and the smaller datagrams are called IP fragments1.
Image by Geoff Huston, reproduced with permission
The IPv4 specification defines the minimal requirements. From the RFC791:
Every internet destination must be able to receive a datagram
of 576 octets either in one piece or in fragments to
be reassembled. [...]
Every internet module must be able to forward a datagram of 68
octets without further fragmentation. [...]
The first value - Continue reading
Unique governance model allows projects to set their own course.
Windstream has been offering BCN services via wholesale for over a decade.
MongoDB reportedly files for an IPO; ADVA completes acquisition of MRV Communications; Mirantis launches Kubernetes and Docker Bootcamp.
NetApp and Microsoft will reveal more details about their partnership later this year.
After a week of waiting (why this is taking so long? this wasn’t a particularly pleasant week), I finally got my number.
Brand new JNCIE-DC #31 !!!
The main note about the lab – time management is the most important thing on the exam. Don’t rush to the keyboard, read and understand all the tasks and it’s interdependencies. Have a plan regarding order of tasks – not all tasks can be completed in order in which they written. Don’t be affraid to skip some tasks if it takes a long time.
I am quite pleased with the level of my preparation for the lab – there were no unexpected or incomprehensible tasks. General feeling about JNCIE-DC lab – this is interesting, pretty complex but fair exam. Lot of tasks on various themes, I think all themes from blueprint are covered in the lab in some ways.
As the proctor told me, the main difficulty of this exam is that it’s something new, and people are afraid of a new and unexpected. I want to tell you – don’t be afraid! If you’re interested in learning a Juniper way of building Data Center networks, and also want to earn one more pretty Continue reading
Sorry about missing last week, but my birthday won out over working:
Ouch! @john_overholt: My actual life is now a science exhibit about the primitive conditions of the past.
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Today we published a new Privacy Policy covering usage of our web sites as well as our collecting and maintaining Personal Data of our members, attendees to our events and subscribers of our various communications.
Tedium is the enemy of productivity. The fastest way for a task to not be done is to make it long, boring, and somewhat complicated. People who feel that something is tedious or repetitive are the ones more likely to marginalize a task. And I think I speak for the entire industry when I say that there is no task more tedious and boring than documentation. So how can we fix it?
I’m not a huge fan of documentation. When I decide on a plan of action, I rarely write it down step-by-step unless I’m trying to train someone. Even then, it looks more like notes with keywords instead of a narrative to follow. It’s a habit that has been borne out of years of firefighting in networks and calls to “do it faster”. The essential items of a task are refined and reduced until all that remains is the work and none of the ancillary items, like documentation.
Based on my previous life as a network engineer, I can honestly say that I’m not alone in this either. My old company made lots of money doing network discovery engagements. Sometimes these came because the Continue reading
Network Interconnections is one of the most important topics for the operator network as it directly related with the cost of the sending traffic out from their networks. I published a network interconnection video on my Facebook page. I explain the peering types, settlement free peering , paid peering , remote peering , IP […]
The post Network Interconnections Video by Orhan Ergun appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
