Show 37 – Even More IPv6 Ready Than Last Week

A short episode this week because of the daylight savings change in the US and Greg didn’t schedule things correctly.


Terry Slattery

Tom Hollingsworth | Twitter: @NetworkingNerd

John McManus | Twitter: @_johnmcmanus_

Matthew Norwood @matthewnorwood

and last, and the very least.

Greg Ferro| Twitter @etherealmind

Topic 1 – Cisco UC or Microsoft Lyncs

What’s the difference ? Does anyone care ?

Topic 2 – Data Cabling

Talking more about MPO cabling and data centre cabling design. Which led into a discussion about data centre floors, power density, suspended cabling floors, contained hot or cold aisles and other related topics.

Greg had a blog post

Topic 3 – IPv6 and NAT

Because we haven’t discussed it enough yet.

Carrier Grade NAT. Deep Packet Inspection and the pathways is forces onto the traffic flows.

Topic 4 – Designing the Network from the Ground Up

How do you approach design a network form the ground up ?



Follow the Packet Pushers on Twitter (@packetpushers | Greg @etherealmind | Tom Hollingsworth), and send your queries & comments about the show to  We want to hear from you!

Subscribe in iTunes and RSS

You can subscribe to Packet Pushers in iTunes by clicking on the logo here.

Media Player and MP3 Download

You can subscribe to the RSS feed or head over to the Packet Pushers website to download the MP3 file directly from the blog post for that episode.


Greg Ferro
Greg Ferro is a Network Engineer/Architect, mostly focussed on Data Centre, Security Infrastructure, and recently Virtualization. He has over 20 years in IT, in wide range of employers working as a freelance consultant including Finance, Service Providers and Online Companies. He is CCIE#6920 and has a few ideas about the world, but not enough to really count. He is a host on the Packet Pushers Podcast, blogger at and on Twitter @etherealmind and Google Plus.
Greg Ferro
Greg Ferro
Greg Ferro
  • Mark

    Hi Guys great Podcast as usuall. I had one quick question about something Greg said that got lost on me. If a company uses a proxy to translate IPv4 to IPv6 in order to all users to view IPv6 sites how does this make sense from the users PC point of you.

    If there is a website that I want to see which is IPv6 doesnt my destination address have to be IPv6? In which case my PC has to support IPv6 and the network between me and my gateway.

  • Kurt Bales

    Hey Mark,

    In a proxy server scenario (think say Squid proxy in your LAN), there are two network transactions that place.

    1. Your computer is configured to use the proxy, so your web browser sends your requests directly to a proxy server.
    – In this case your computer will connect via IPv4 to your proxy server and request a website at (most likely) a DNS name.

    2. Your proxy server then establishes a new network connection to the requested host, and "Proxies" the traffic to your host.
    – If the DNS name you requested returned an AAAA record then the proxy server has the option to establish connectivity via IPv6 to the webserver.

    Essentially it would look something similar to this

    [PC] <== IPv4 ==> [Proxy] <==IPv6 ==> [WebServer]

    A reverse proxy works in essentially the same manner, but in the opposite direction.

    Hope this helps,