1. Speak, 2. Think

Speaking before thinking since 1981

VLAN attacks in TRILL

Without a proper understanding of TRILL’s behaviour an engineer introducing TRILL to a network may make it vulnerable to VLAN attacks.
Background
In 802.1Q networks VLANs provide isolation between different sets of end stations. An end station on one VLAN is unable to transmit a frame to an end station on another VLAN. In a VLAN attack [...]

Submission on the Broadband Investment Initiative

I haven’t been doing so well with the one post per week goal lately, but here is my submission on the Government’s Broadband Investment Initiative.
The proposal seems to believe that wholesale unbundled dark fibre is the best method to serve all customers, which is absolutely incorrect. The negative impacts identified in this submission are caused [...]

Early history of the TRILL header

Stemming from my interest in why TRILL did not use MPLS, I have summarised the early history of the TRILL header. This can also be found in plain-text format here. There is still more to it, which I shall attempt to elaborate on later, but this covers the shift away from a MPLS.
An abridged history [...]

MPLS encapsulation for TRILL

Back in September, 2008, I watched an interesting Google Tech Talk by Radia Perlman that introduced me to TRILL: Routing without tears; Bridging without danger. If you find this interesting you should also read Radia’s original Infocomm paper: Rbridges: Transparent Routing.
After watching this I became very interested in why MPLS was not used. MPLS appears [...]

  • About

    Everyone seems to be doing this microblog thing. (See The Daily Show for an explanation of "microblog".) So I thought I'd take it back a decade and do the macroblog thing. (Ha! Take that, Zeitgeist.)

    The intention is was to write one post each week over 50 weeks. The anticipated result is a lot of unoriginal thought.

    The other intention is to sort and tidy my projects for uploading.

    This is an experimental blog, so fast and loose opinions are likely. They are, of course, my own at the time of writing, and naturally subject to change.

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