rajeevan

welcome to my blog, being little bit on the nerd side; own quite a few domain; i though it would be a good idea to create a site (being lazy: using tumblr) to share something that intrigue me ...scroll down to see the posts, that is if you are still curious...

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How unique your browser you think it is

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More OpenSSL vulnerabilities announced

by TJNII

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Life of sysadmin; now days

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9 Linux Commands To Be Known To Secure Your Linux From Danger

9 Linux Commands To Be Known To Secure Your Linux From Danger . Linux shell or terminal commands are very powerful and just a simple command could lead one to delete a folder, files or root folder, etc.

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Ban TOR relay from your Server

https://github.com/rajeevan/BanTorRelays

Recently we have been scrapped using TOR network, When they do it in an excessive rate; your website performance will degrade very rapidly and TOR makes it difficult to block IP address.

I needed a quick and dirty solution to BAN TOR relays from accessing our server. Tor network do provide information on how to detect tor relays using TorDNSEL; but that is not a quick solution we can integrate!

Alternative I found that they do support generating a list of relays that can connect to given IP address on a port.

No it's time to cook some dirty recipe to block those relays from hitting our web services; We do have iptables running to do some basic filtering, and all I need to do is to add these IP address to the blocked list.

Here is the quick and Dirty Bash script: https://github.com/rajeevan/BanTorRelays that will block all tor relays, given that these relays change quite often and I do not want to ban TOR relays permanently; I decided to build this script and we can reset the ban by simply restarting / reloading the iptables

It's best to use the ipset instead of directly using iptables for performance, but that is for another time ;)

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Cool android codes :)

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Command-line radio for computer geeks.

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Learn with free books

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Python expert Karolina Alexiou shows how to avoid some of the most common pitfalls that developers run into when using Python for big data analytics.

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Learn...

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What colour is it?

the time....... now in colour.

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Regex Crossword

A crossword puzzle game using regular expressions. Earn achievements completing puzzle challenges. Easy tutorials for people new to regular expressions.

Learn RegEx the Funway?

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Sysdig is open source, system-level exploration: capture system state and activity from a running Linux instance, then save, filter and analyze. Think of it as strace + tcpdump + lsof with a little Lua cherry on top.

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IPv6 Quick Guide - Learn IPv6 (Internet protocol Version-6) in simple and easy steps. A beginner's tutorial containing complete knowledge of IPv6, IPv6 Features, Addressing Modes, Address Types, Address Format, IPv6 Special Addresses, IPv6 Headers and Extension Headers, Communication in IPv6, IPv6 Subnetting, IPv6 Mobility, Transition from IPv4 to IPv6, Routing in IPv6, IPv6 deployment and future aspects.

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Who is using my PORT

# netstat -tulpn | grep :80