http://bobcares.com/index.php/blog Bobcares Thu, 02 Sep 2010 00:19:20 +0000 http://wordpress.org/?v=2.5.1 en http://bobcares.com/index.php/blog/?p=753 http://bobcares.com/index.php/blog/?p=753#comments Wed, 01 Sep 2010 10:00:47 +0000 Vicky Karmakar http://bobcares.com/index.php/blog/?p=753 http://bobcares.com/index.php/blog/?feed=rss2&p=753 http://bobcares.com/index.php/blog/?p=759 http://bobcares.com/index.php/blog/?p=759#comments Mon, 30 Aug 2010 10:00:46 +0000 Remya Vipin http://bobcares.com/index.php/blog/?p=759 http://bobcares.com/index.php/blog/?feed=rss2&p=759 http://bobcares.com/index.php/blog/?p=769 http://bobcares.com/index.php/blog/?p=769#comments Sun, 29 Aug 2010 10:00:51 +0000 Hamish Oscar Lawrence http://bobcares.com/index.php/blog/?p=769 http://bobcares.com/index.php/blog/?feed=rss2&p=769 http://bobcares.com/index.php/blog/?p=767 http://bobcares.com/index.php/blog/?p=767#comments Fri, 27 Aug 2010 11:09:27 +0000 Sankar H http://bobcares.com/index.php/blog/?p=767 http://bobcares.com/index.php/blog/?feed=rss2&p=767 http://bobcares.com/index.php/blog/?p=751 http://bobcares.com/index.php/blog/?p=751#comments Wed, 25 Aug 2010 10:00:54 +0000 Vicky Karmakar http://bobcares.com/index.php/blog/?p=751 nslookup bogus123.com Server: ed-002-sfo.abc.com Address: 192.168.1.9 Non-authoritative answer: Name: google.com Addresses: xx.104.7.99, xx.104.7.104 Now we have found the IP address from the corresponding hostname. With this IP address, we will search for the ISP or DC to whom this IP address belongs. How do I find the concerned ISP or the DC? Have you heard about the term “whois”? It is a protocol by which we can determine the registrar of the domain name or IP address. On linux, you can try the “whois” command as follows. $whois xxx.110.110.110 Unfortunately there is no such utility present on windows. You can use this [2] site to get the whois information about the IP address. Then check for the word “abuse” in their. There will be a email address to which abuse complains concerning the IP address can be sent. It will look something like this. ---------------------------- remarks: * For abuse/spam related to this IP address block, remarks: * please send email to: abuse@link.abc.in ---------------------------- Voila! now that you have these deails, just shoot a complaint over to them. If everybody is vigilant enough against spamming, we can surely fight this menace. Prevention is better than cure. Here are some tips, to help stop your email address from getting bombarded with spam: 1. Never reply to mails which you consider as spam. If you reply, the spammer will be assured that your mail account is an active one and will send you more mails(read: spam). 2. Never click any link or download any attachment from a spam email. These can be malicious objects to infect your system. 3. Have your antivirus, web browser and OS always updated. They are often patched up for known security vulnerabilities. 4. Always have more than one email id's, use one of them only to register on public websites such as social networking sites, forums, newsletters and other for professional use. 5. Do not use your email id as john@example.com instead use john_@_example_dot_com. This way the crawlers on internet would not be able to scan and store your email id. 6. Be informed about spam. Do not accept it. Complain to the concerned authorities. Laws are getting stricter, it is time we fight back this menace. Though the procedure lined above to identify the spammer can be done using tolls on a website like spamcop.net, isn't it always better to know what happens under the hood ? That's what I'll be covering in the next part of my post, analyzing email headers. Check back next week! About the Author It has been over 6 months since Vicky Karmakar joined the Poornam family. A graduate in Information Technology, Vicky has always been interested in exploring the newer ventures of the Open source technology with an acute inclination towards network security. He also harbors a passion towards writing poetry and cooking culinary delicacies. Co-Authored by Hamish O. Lawrence [1] http://www.spamcop.net/fom-serve/cache/19.html [2] http://tools.whois.net/whoisbyip/]]> http://bobcares.com/index.php/blog/?feed=rss2&p=751 http://bobcares.com/index.php/blog/?p=749 http://bobcares.com/index.php/blog/?p=749#comments Mon, 23 Aug 2010 10:00:40 +0000 Remya Vipin http://bobcares.com/index.php/blog/?p=749 Virtual Hosts -> Add. You will see a Virtual Hosts Page3. Click Add Enter the Virtual Host Name : eg: mytestdomain.com Default Cluster : clusterHTTP Configure File : $SERVER_ROOT/conf/mytestdomain.com.xml Click SAVE4. You will see a message "Input error detected. Please resolve the error(s)" Click the link "CLICK TO CREATE" Click SAVE5. Click SAVE, again, to finish. Now your Virtual Host has been added.6. Next click the link "Apply Changes". Now we need to configure clusters: 7. Click on the Clusters tab.8. Click ClusteHTTP9. Click on the Worker Group tab10. Click on nodeHTTP/LI>11. Click Edit, to continue12. Enter the loadbalancer server address and the address of the servers that are being load-balanced. Please replace with your respective ip address: (mytestdomain) = node name 1.1.1.1 = load balancer ip address 1.1.1.2 and 1.1.1.3 = 2 web servers This will make sure that if someone tries to access mytestdomain.com, the request will be reach the load balancer first and then will be routed to the server with the least load. 13. Click SAVE14. Click on Listeners tab.15. Click View/Edit16. You need to click "Add" to add our virtual host mytestdomain.com, into Listener17. Click Add18. Choose your Virtual Host : eg: mytestdomain.com Input your Domains : mytestdomain.com, www.mytestdomain.com19. Click SAVE20. Click on "Apply Changes" in the message: "Configuration has been modified. To apply changes, perform Graceful restart Apply Changes"21. Click Apply Changes / Graceful Restart And thats it! You have now installed the LiteSpeed Load Balancer. Here are a few issues I faced with the LiteSpeed Load Balancer: If you see 503 messages in your browser, you need to increase "Initial Request Timeout (secs)" in clusterHTTP worker.In case of DOS attack, you need to set "Connection Soft Limit" and "Connection Hard Limit" to block aggressive IP.If you want to split the work load among the servers, you just need to assign different values for "Max connections" to the different serverslike "100" connections to server1, "50" connections to "server2". LiteSpeed Load Balancer will use this as "weight" for different backend. I hope this tutorial will help you achieve faster response times for your sites. About the Author: Remya Vipin has been with Bobcares for the last 6 years. She is an expert in cPanel-Linux servers and Linux server administration. She loves her work and aims to keep all her clients satisfied, but not as much as she loves spending time with her son. ]]> http://bobcares.com/index.php/blog/?feed=rss2&p=749 http://bobcares.com/index.php/blog/?p=761 http://bobcares.com/index.php/blog/?p=761#comments Fri, 20 Aug 2010 14:15:54 +0000 Sankar H http://bobcares.com/index.php/blog/?p=761 http://bobcares.com/index.php/blog/?feed=rss2&p=761 http://bobcares.com/index.php/blog/?p=747 http://bobcares.com/index.php/blog/?p=747#comments Thu, 19 Aug 2010 10:00:27 +0000 Hamish Oscar Lawrence http://bobcares.com/index.php/blog/?p=747 http://bobcares.com/index.php/blog/?feed=rss2&p=747 http://bobcares.com/index.php/blog/?p=735 http://bobcares.com/index.php/blog/?p=735#comments Tue, 17 Aug 2010 10:00:44 +0000 Dhanya P.B. http://bobcares.com/index.php/blog/?p=735 http://bobcares.com/index.php/blog/?feed=rss2&p=735 http://bobcares.com/index.php/blog/?p=745 http://bobcares.com/index.php/blog/?p=745#comments Sat, 14 Aug 2010 02:40:35 +0000 Sankar H http://bobcares.com/index.php/blog/?p=745 http://bobcares.com/index.php/blog/?feed=rss2&p=745