Cisco Service Discovery Gateway – Enabling Zeroconf in Enterprise Networks
I’ll admit it: I’m what others call an Apple fan boy. One of the many reasons for being one is the polished user experience and the ease-of-use of their products. One of the underlying technologies that enables the user to discover devices and services on the network is Zeroconf or, as Apple calls it, Bonjour.
Zeroconf consists of three major components:
Address auto configuration,
If your network doesn’t have a DHCP server or you haven’t statically assigned an IP address to your host, most operating systems will use an automatic private IP address. I’m not going into much detail on address auto configuration except that this is typically done using a technique called APIPA (Automatic Private IP Addressing) for IPv4 the host will use the famous 169.254.0.0/16 addresses or, in case of IPv6, by using link-local addresses only (FE80::/10) which has been designed into IPv6 as a basic functionality from day one. Also, naming is not of much of a concern in the context of this discussion. However, it is worth mentioning that Zeroconf names can contain Unicode characters and whitespace, which can make those names a lot more user friendly and meaningful contrary to pure DNS names.
The more interesting part, as it pertains to Zeroconf, is the service discovery. Read More »
True Story: The night I arrived in Orlando I was exhausted & hungry. I headed to a neighboring hotel to meet a colleague for dinner, entered the hotel from a side door, and realized I was lost. The <REDACTED> hotel and conference center had electronic maps on the walls, but they were poorly done (that’s my story) and it took about 20 minutes to find my way out of the maze. Realizing I had gone in a loop amid abandoned conference rooms was the low point. As much as I love that potential setup for a horror movie (She thought she’d visit a friend, but never suspected the grave danger that lurked in that funhouse of hallways in “The Beige Lands of Doom”. Don’t open Hall A!) I was grumpy by the time I found my friend. Thankfully, Connected Mobile Experiences could spare people this fate and help them remain pleasant to dine with. Unfortunatly, it wasn’t there in this scenario and adult beverages were requested by all. Read More »
In my last two blogs I discussed the challenges Enterprises are facing for their WAN, the differences between Enterprise needs in their LAN and WAN, and how the traditional ONF model for SDN isn’t practical for the Enterprise WAN. Let’s now look at how the new Cisco ONE Enterprise Architecture can address this.
In my last blog I introduced challenges Enterprises are facing in their WAN deployments and the definition of ONF SDN. While the broad definition of ONF’s SDN architecture implies many theoretical answers to these challenges, we need to be pragmatic. Let’s take a look at the practical differences in LAN and WAN networks that affect how you’d deploy SDN on each. Read More »
Hi All! For this video my trusty film crew and I are still here in Orlando for CiscoLive 2013 and got in some great interviews! In this episode I learn about Smart Connected Vehicles (and why you shouldn’t hack them), meet with Chris Tillett (@christillett) of Halifax Media Group and find out why the new Cisco ISR 4451-X is the router for him, I get to sit in and program the Delorean time machine we had in our booth, and JOHN CHAMBERS GIVES ME AND MY TRUSTY FILM CREW A THUMBS UP. Yes, that needed all caps, because it is awesome and I didn’t even realize it until the episode was posted! Also, I tested the tensile strength of the CiscoLive sign.