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

Google Apps [GApps] for Android 4.4.2 custom ROM available for download

For those of you who want to use or already used Android 4.4.2 KitKat custom ROM and looking for the Google Apps [GApps] 4.4.2 is now available for download.

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13 December 2013 by Fuad NAHDI
Categories: Gadgets | Tags: , | Leave a comment

Android 4.4.2 KitKat is now available for Galaxy Tab P1000

android-442-kitkat-p1000

I just surprised. It is almost unbelievable that my first generation of Samsung Galaxy Tab GT-P1000 has just received Android 4.4.2 KitKat, thanks to CyanogenMod 11 custom ROM and especially thanks to terenceng who posted the ROM on a forum thread in XDA-Developers forum.

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13 December 2013 by Fuad NAHDI
Categories: Gadgets | Tags: , | Leave a comment

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