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General Musing

blaze your trail

Posts Tagged ‘network

On the Border of the Internet #risk

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The age old lie told by ISP support desks: ” The Internet is down,” was briefly reality again yesterday.

The past couple of days I’d been seeing and hearing comments that there was a disturbance in the force of the Internet. Initially a NANOG message was posted about a general malaise or instability in the Internet, some humorous quips were posted in response and the matter was soon forgotten.

A network operator looking with hindsight said that they had been able to see more than normal numbers of updates coming on BGP which is normally an indicator of network instability being solved by rerouting round the problem. That is all part of the normal operation of the Internet. And sometime yesterday morning as the east coast of the US was getting to work the looming disaster struck.

Juniper network devices started core dumping and restarting due to a bug in the code which handled the BGP UPDATE messages as another large updated was arriving. The self healing properties of the Internet broke and the Internet went with it. The Great Juniper Outage of 2011 was born.

Avoidable?

Almost certainly. The reliance on the hardware of one specific vendor on the part of large ISPs – backbone carriers – creates a single point of failure which is bad – mkay. A fail over situation should always be in place, not just at the ISPs. Companies who rely on the Internet for business should take this into account too. A recent outages at some of companies I consulted said that by placing their faith in one specific vendor they had created a single point of failure which had caused some high profile repercussions.

Do you have a single point of failure?

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Written by Daniël W. Crompton (webhat)

November 8, 2011 at 7:13 am

Posted in hardware, risk, technology

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6 Months of Security Links #2011

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I’m a regular curator of daily links, and like to give overviews of my collection of curated links and posts. This is partly as there are some good sources and articles in here and as I am working on a research project which I started based on a number of books I read.

I’m sure you’ll find something interesting in the items below – there are some gems in the list – and I dare to hazard the guess you might learn something you wanted to know. 🙂

Read the rest of this entry »

Written by Daniël W. Crompton (webhat)

July 15, 2011 at 4:10 pm

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Cloud Computing

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For some time I’d been trying to define what cloud computing was for myself. A number of people have tried to define it at the Cloud Computing Expo, it was all written down in Twenty Experts Define Cloud Computing.

Personally I think Cloud Computing is more like an adaptive Grid, were Grid is distributed over a homogeneous platform Cloud is a more dynamic heterogeneous environment.

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Written by Daniël W. Crompton (webhat)

July 19, 2008 at 1:06 pm

Posted in network

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IPv4 address space filling up

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I have a digital subscription to Electronic Design Europe Digital and they lead with scaremongering. The IPv4 address space is filling up.

The Organisation for Economic Co-operation and Development (OECD) has established that 3.65 billion of the 4.3 billion available addresses are already allocated to Internet users. This organisation believes that within three years, the world will have exhausted its stock of IP addresses.

This is something which has been known for years, if it wasn’t for such techniques such as NAT (Network Address Translation) we’d be over the edge already.
One of the issues, as stated in the article, is that the lack of IP numbers brings an additional problem there is little space left for the coexistence of IPv4 and IPv6. The address translation requires IPv6 and IPv4 addresses to be linked, in a method similar to NAT.
Besides from this there are many more advantages to IPv6, security and efficiency.

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Written by Daniël W. Crompton (webhat)

July 7, 2008 at 4:15 pm

Posted in network

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