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Yep, Postini Really Was Down
Updated 10/15/09 If you use Postini to handle your mail, you might be wondering where all your mail was today.
Has Networking Lost Its Mojo?
I don't know about you, but I'm pretty down these days about the state of things in SOHO / SMB Networking land. I mean, when was the last time that you were excited about a networking product? For me, it's been a long while.
Trying out Google Search
If you're a frequent visitor to the Search box up there on the navigation bar, you will notice something new the next time you use it.
Multicasting and the Small Network, Part 3
I've covered some of the basic elements of Multicasting, such as IGMP and the Layer 2 switching components in my previous posts (Part 2). This article will go into the technology behind Multicasts at Layer 3 and some of the issues limiting wider use of Multicast technology.
As you recall in my first post, I observed that Yahoo's transmissions of live NHL games would seem to be good candidates for Multicast, yet were being sent as unicast. Then I covered the simple issue of enabling Multicast within a local area network. Coming full circle, here we are diving into Multicast technology to understand why it isn't more widespread.
Multicasting and the Small Network, Part 2
In my last post, I discussed multicasts and some of the basic concepts. This time, I'm going to discuss technologies used by switches and routers to enable and configure multicasts. Specifically, I'm going to dive into addressing and IGMP. Understanding the details behind multicasts helps understand configuring multicasts as well as the issues limiting the use of multicasts on the web.
Multicasting and the Small Network – Part 1
With the growth of IPTV and other IP media streaming technologies, applications for multicast technology are increasing. Live Video broadcasts and VoIP applications are viable uses for real time transmissions over an IP network from a single source to multiple recipients.
Most data transmissions are unicasts, which are a one-to-one data stream sent from one device to another device. Email, web surfing, and file downloads are all examples of unicasts, even for the busiest sites or most downloaded files. Although a single web page may be visited thousands of times each day, each time it is viewed it is individually transmitted to the requestor's PC as a unicast.
Packet Capture to the Rescue
In my last two posts on this subject, I've covered some of the basics and tools used to perform packet captures, highlighting the well known software from Wireshark. In this installment, I'm going to show how I used Wireshark packet captures to solve a real network problem.