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Showing posts from December, 2011

How to detect Multicast traffic flooding a switched network

Multicast traffic specially the one generated by Microsoft's NLB Cluster can flood the network even if it is switched network. Network engineers will often feel the switches acting like a classic hub completely defeating the purpose of switched networks. Microsoft intentially did this in their NLB Cluster by design to achieve the load balancing or express delivery or response to network traffic dealt by their load balancers. In order to track or detect symptoms you will have to trace network packets across network from any port. This can be done using Wireshark on Windows and Snoop on Solaris Unix systems. Packet trace will usually be carried out on one of the network interface connected to VLAN or network in question. In below example we are using Unix snoop command but we would also use other commands to determine what is required. $ bash # access the Bash Shell $ ifconfig -a # list the interface details and write down the interface you want to investigate. No

Canon Lens dilemma for new photographers

You may all know the DPReview which provides with extensive reviews about popular cameras however I often get stuck in selecting correct lens or lenses for the next camera I'll own. The site that I found very useful in explaining Canon lenses along with recommendations and comparison keeps disappearing from my memory so I thought I'll make a record here not only for myself but all of us. Canon Lens Reviews - My Favourite Lenses are; 1.  Canon EF 50mm f/1.8 II Lens Review - £74 on Amazon 2.  Canon EF-S 17-85mm f/4-5.6 IS USM Lens Review (Good)  -  £334 on Amazon 3.  Canon EF 70-300mm f/4-5.6 IS USM Lens Review (Okay but good for me)  -  £356 on Amazon Canon EF-S 18-200mm f/3.5-5.6 IS Lens Review (bit Pricey) - £408 on Amazon Canon EF 28 135mm f/3.5-5.6 IS USM Lens (Not RingUSM) - £374 on Amazon Canon EF-S 55-250mm f/4-5.6 IS II Lens Review (as Kit) - £146 on Amazon   Canon EF 75-300mm f/4-5.6 III Lens Review (no