Install Windows 10 on MacBook Pro using VMWare Fusion

windows-10-screenshot

The upcoming Microsoft’s next Windows operating system is not Windows 9 but Windows 10. The technical preview of Windows 10 had been released on the end of September 2014, so users can download and try its look and feel.

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22 October 2014 by Fuad NAHDI
Categories: Microsoft | Tags: | Leave a comment

How to configure SPAN and RSPAN in Cisco Catalyst switches

Cisco-SPAN-Sample-Configuration

Switched Port Analyzer (SPAN) allows you to send a copy of traffic passing through ports to another port on the switch. SPAN is important to mirror received or transmitted (or both) traffic on one or more source ports to a destination port for analysis. While SPAN is mirroring ports in the same switch, RSPAN(Remote SPAN) is mirroring ports in one switch to a port in different switch.
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17 October 2014 by Fuad NAHDI
Categories: Network | Tags: , , | Leave a comment

How to prevent DNS server as an open recursive resolver

As a system administrator, it is your responsibility to make sure that DNS servers are configured correctly. In this tutorial I want to show you how to secure the DNS servers preventing as an open recursive resolver.
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19 August 2014 by Fuad NAHDI
Categories: BSD, Linux, System | Tags: , | Leave a comment

Source-based IP Routing in Linux

source based ip routing

Our company has two upstreams for internet access. Assume that the upstreams are ISP1 and ISP2. The router is using Linux running BGP (Quagga) for dynamic routing between the two upstreams. See the image below.

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15 January 2014 by Fuad NAHDI
Categories: Linux, Network | Tags: , | Leave a comment

BGP Next-Hop Inaccessible

One of our customers complained that they did not receive several prefixes from our router / their BGP peer, but they received the prefixes from others (ISP). I had to go to check this routing table in our router.

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15 January 2014 by Fuad NAHDI
Categories: Network | Tags: , | Leave a comment

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