Scott's Weblog The weblog of an IT pro specializing in virtualization, networking, open source, and cloud computing

Setting Up ipfw on Mac OS X

Using multiple layers of security has long been recognized as a useful strategy in hardening your computers against attack or exploit. In this post, I want to explain how to set up and configure the BSD-level ipfw firewall that is present in Mac OS X. While ipfw is certainly not a security panacea, it can be a solid part of a broader security strategy.

(Read more...)

Killing Ads in RSS Feeds in Vienna

Almost five years ago (in mid-2007) I wrote about how to kill ads in RSS feeds in NetNewsWire. That technique has been a lifesaver for me, as I rely heavily upon RSS feeds to stay up-to-date with information and trends.

(Read more...)

The Hypervisor is Only Part of the Picture

The question of VMware’s future in the face of increasing competition is not a new one; it’s been batted around by quite a few folks. So Steven J. Vaughan-Nichols’ article “Does VMware Have a Real Future?” doesn’t really open any new doors or expose any new secrets that haven’t already been discussed elsewhere. What it does do, in my opinion, is show that the broader market hasn’t yet fully digested VMware’s long-term strategy.

(Read more...)

The OS is Dead, Long Live the OS

I just finished reading a post on ZDNet titled “Are Hyper-V and App-V the new Windows Servers?” in which the author—Ken Hess—postulates that the rise of virtualization will shape the future of the Microsoft Windows OS such that, in his words:

(Read more...)

Why SR-IOV on vSphere?

Yesterday I posted an article regarding SR-IOV support in the next release of Hyper-V, and I commented in that article that I hoped VMware added SR-IOV support to vSphere. A couple of readers commented about why I felt SR-IOV support was important, what the use cases might be, and what the potential impacts could be to the vSphere networking environment. Those are all excellent questions, and I wanted to take the time to discuss them in a bit more detail than simply a response to a blog comment.

(Read more...)

SR-IOV Support in the Next Version of Hyper-V

While browsing my list of RSS feeds tonight, I came across a series of articles by John Howard, a senior program manager on the Hyper-V team at Microsoft. The post was one of a series of posts describing SR-IOV support in the next version of Hyper-V, found in Windows “8”. I hadn’t heard that Microsoft was adding SR-IOV support to the next version of Hyper-V, so when I saw that I was surprised. Personally, I think SR-IOV support is a big deal (see the note at the end of this post for why).

(Read more...)

Scoop: Special Guest Speakers at Cisco Live 2012

Last year I had the opportunity to attend Cisco Live in Las Vegas for the very first time, and it was a tremendously rewarding conference. I guess I did enough liveblogging and tweeting at the show that I garnered the attention of the Cisco Live social media team, who just shared with me a scoop regarding the guest speakers at this year’s Cisco Live in San Diego.

(Read more...)

Some Thoughts and Questions About STT

I just finished reading the Internet Draft for Stateless Transport Tunneling (STT), a proposed protocol for network virtualization. STT’s contemporaries are VXLAN (Virtual eXtensible Local Area Network) and NVGRE (Network Virtualization using Generic Routing Encapsulation), both of which are also described in IETF Internet Drafts. The goal of all of these protocols is to virtualize (abstract) the physical network topology and bring functionality like isolation of multiple tenants, isolation of overlapping address space between multiple tenants, expanded VLAN/tenant ID address space, and enhanced VM mobility (by providing L2 services over an L3 network, for example).

(Read more...)

Presentation from VMware Partner Exchange

On February 13, just before the official start of VMware Partner Exchange in Las Vegas, NV, I had the opportunity to present at the EMC Boot Camp. It’s beginning to seem that all my presentations focus on stretched clusters, but I assure you that’s not the case (give me a day or two and I’ll prove it to you). In any case, here’s the deck that I used during my presentation at the EMC Boot Camp.

(Read more...)

Presentation from Australia VMUG Conferences

In early December of last year, I had the great opportunity to travel to Australia to participate in the inaugural full-day VMUG conferences in both Brisbane and Melbourne. I have been remiss in publishing the presentation that I gave at those meetings, so I’m fixing that now!

(Read more...)