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on 27th February 2015 / by sandeep.sasikumar
rsync is a powerful file and folder synchronisation tool in linux. To read more about rsync please go through this link:http://www.zyxware.com/articles/2717/how-to-backupcopysynchronise-a-full-folder-lying-on-a-remote-server-onto-another-localremote-machine-easily-using- 'rsync -a' option preserves the permissions, ownership, timestamp of files and folders that are to be rsynced. To rsync a file or folder from source to destination usually we use the format: rsync source destinationInorder to preserve the above mentioned permissions, ownership and timestamp use the command: rsync -avz source destination This will synchronize the two folders or files and also maintain the same timestamp as that of source. To test whether this has been done right you can check the permission of files in folder in source destination using 'ls -al' command. Networking Leave a reply Your email address will not be published. Required fields are marker *
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on 27th February 2015 / by sandeep.sasikumar
rsync is a powerful file and folder synchronization tool in Linux. To read more about rsync please go through this link:http://www.zyxware.com/articles/2717/how-to-backupcopysynchronise-a-full-folder-lying-on-a-remote-server-onto-another-localremote-machine-easily-using- rsync usually creates files or folders that are present in source to the destination folder. But there are cases where the files has been removed from source but thay are still present in destination. This can some times cause problems as the destination directory keeps on increasing in size but the source directory size is less. It usually happens when an rsync has been run by keeping a tar.gz file at the source. This will sync the tar file to the destination but even if you remove the tar file from source it will have a tar file copy at the destination. So to avoid such things and also to keep both source and destination up to date we can use rsync '--delete' option rsync -avz --delete source destination This will synchronize the two folders and remove the other unwanted files from destination and keep both source and destination up to date. Networking Leave a reply Your email address will not be published. Required fields are marker *
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on 08th December 2014 / by sandeep.sasikumar
Nmap(Network-mapper) is an open source tool that is pretty useful for networking scanning. This tool provides various options that are useful for carrying out security audits. Nmap is a powerful tool used to check the network inventory, host uptime etc. If you are a GNU/LINUX administrator, you may find the following 10 Nmap commands extremely useful Some of the useful Nmap commands are as mentioned below: Scan a single host in the network. nmap [IP-address of the host] Scan multiple hosts in the network. nmap [Hostname of the host] Scan whether a host is firewall protected nmap -sA [IP-address of the host] Scan whether a network is firewall protected nmap -sA [IP-address series of the network] Scan a full network and find out which devices are up and running nmap -sP [IP-address series of the network] Fast scan options nmap -F [IP-address series of the network] Display all open ports and also display the number of closed ports nmap --open [IP-address of the host] Scan specific ports nmap -p [port-number] [IP-address of the host] Scan the operating system of remote host nmap -O [IP-address of host] Scan the service version number of remote host nmap -sV [IP-address of the host] Networking Bash GNU/Linux Leave a reply Your email address will not be published. Required fields are marker *
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on 23rd November 2012 / by sandeep.sasikumar
Before we start counting the steps for troubleshooting, the first thing we have to do is, arrange networking components in a structured and systematic order. This will help us define the problem correctly and give us a clear idea about issues that happen regularly. The few steps that are to be followed are: Number each and every system at your office. Number each connected router and switch in the network. Number each cable that connects devices to the switch, and also those cables from the switch to the router. Name them in a good way so as to identify the cable from the name itself. Check the performance of all PCs, wireless/wired routers, switches and the cables that connect each of these devices together. By pinging, check the connection between routers and switches and also between switches and PC's. Note down if any packet loss occurs. Check the RJ45 pins of each cable and re-crimp all defective cables. Write a script to check the network connection, with the following behaviour: Whenever there is a connection issue, the script writes the error message to a text document. The script will be set as a cronjob so that it will ping every minute to check the network connection. Make sure that the script is running on atleast one of the PC’s which are connected to each switch. Now you can see that everything is in a good ordered way. If any connection problem occurs you will be able to sort it out in much lesser the time than it took you before. The script to check the network connection would prove very useful as it will give you a clear idea of when and where the problem occurs. Hope this article helps you in your Network Troubleshooting efforts. Let me know if you have anything more to add to this. Thanks! Networking System Administration Network Troubleshooting Leave a reply Your email address will not be published. Required fields are marker *
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on 16th November 2012 / by sandeep.sasikumar
Most web developers & system administrators have to do SSH logins to WHM based servers to make the necessary changes there. The default port used for ssh logins is port 22. However there might be unusual circumstances where port 22 is not the default port. In such a scenario we need to identify the default ssh-port used by the server. If you are facing a similar situation then read on to know how to find out the current port being used by SSH on a WHM based server. Here are the steps to identify the default ssh-port from WHM: First Login to the WHM with your username and password. In the 'Plugins' option click on the 'ConfigServer Explorer' option. From the list of folders select the 'etc' folder. In the next list of folders select the 'ssh' folder. Within this list click on the 'ssh config' file. The ssh config file consists of the details of the ssh-port which is selected as the default. In most cases the port will be 22. However if you are having any problem with your ssh connection, follow the steps mentioned above and find out which is the default ssh-port used and then try to ssh using that port. Linux Networking WHM Network Security cPanel Web Security SSH Leave a reply Your email address will not be published. Required fields are marker * Talu (not verified) access_time 19 Apr 2019 - 19:50 Hi: Thanks for this article, I was forgoten the port of my ssh but in the last version of WHM (11.38.2 build 7) or on my server, the 'ConfigServer Explorer' option is not available so I find the port on the firewall settings 'ConfigServer Security & Firewall' under 'Allow incoming TCP ports' and descarting the default know ports such as ftp, web, etc. http://www.talu.me/ Add new comment
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on 23rd July 2012 / by nitheesh.cs
Some of the latest Laptops especially Dell Inspiron 5420 and Lenovo G580 series comes with Atheros Network driver which has some problem with Ubuntu 12.04. The problem is that it will not detect the wired network connection(eth0) even though wireless connection is working fine. We can solve this issue by installing the proper network driver. First you have to download the latest driver from here http://linuxwireless.org/download/compat-wireless-2.6/Open Terminal (Alt+Ctrl+T) and extract the downloaded file using following command. tar -xvf compat-wireless-2012-07-03-p.tar.bz2Copy and paste the following commands one by one to change the working directory and install the driver cd compat-wireless-2012-07-03-p scripts/driver-select alx make sudo make install sudo modprobe alxDone. Now you should be able to connect to the Internet using wired network. Zyxware is a leading global Drupal development company from India. We offer the services of our expert team of Drupal developers as On demand Drupal support. To know more please Contact us Networking Ubuntu Leave a reply Your email address will not be published. Required fields are marker * Aravindr (not verified) access_time 19 Apr 2019 - 19:50 I am facing the same problem.So I was trying to follow your instruction.But the alx folder is empty.atlx atl1e atl1c are non-empty Anonymous (not verified) access_time 19 Apr 2019 - 19:50 In reply to I am facing the same by Aravindr (not verified) pc.tar.bz2 works. p.tar.bz2 doesn't Anonymous (not verified) access_time 19 Apr 2019 - 19:50 In reply to pc.tar.bz2 works. p.tar.bz2 by Anonymous (not verified) Thanks for the last reply! It´s the solution! Anonymous (not verified) access_time 19 Apr 2019 - 19:50 In reply to pc.tar.bz2 works. p.tar.bz2 by Anonymous (not verified) Any other comment on that, I am having the same issue with my lenovo T420 pkuphy (not verified) access_time 19 Apr 2019 - 19:50 In reply to I am facing the same by Aravindr (not verified) Hi, it seems that the latest compat-drivers does not support alx anymore. So try the drivers released before 2012-05-10. Good luck ^_^ Add new comment
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on 25th May 2012 / by Anoop John
Nmap is a Free Software tool that can be used for a variety of network network exploration tasks and security auditing. Nmap ("Network Mapper") scans IP packets to determine a lot of different aspects about hosts available on the network and also about services these hosts are offering. It can help you find a lot of information about these hosts including reverse DNS names, operating system guesses, device types, and MAC addresses. Here is a simple command to find all active IPs in your local area network using nmap nmap -sP 192.168.1.0/24 You can install nmap in Ubuntu / Debian by running sudo apt-get install nmap Alternatively you can also use sudo arp-scan -I eth0 192.168.1.0/24 Networking Ubuntu Debian Linux Shell Network Security Leave a reply Your email address will not be published. Required fields are marker *
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on 20th February 2012 / by webmaster
The Huawei USB modem that comes with new Reliance Netconnect+ mobile broadband connections might not work out of the box on an Ubuntu 11.10 box if the device id of the modem is 12d1:1505. Plug the modem into a usb port and run lsusb and check if the following line appears in the output - ID 12d1:1505 Huawei Technologies Co., Ltd - and if it does then read on to see how to get this modem working on your computer. Create a file named 12d1:1505 inside /etc/usb_modeswitch.d/ and copy the following into the file DefaultVendor= 0x12d1 DefaultProduct=0x1505 MessageContent="55534243123456780000000000000011062000000100000000000000000000" Now run sudo usb_modeswitch -I -W -c /etc/usb_modeswitch.d/12d1:1505 Now run lsusb and you will no longer see the device 12d1:1505 in the list and instead see 12d1:140b. If so your modeswitching has worked and your device should be ready to be used as a wireless broadband modem. If you add the following line ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="1505", RUN+="usb_modeswitch '%b/%k'" in the file /lib/udev/rules.d/40-usb_modeswitch.rules just above the line LABEL="modeswitch_rules_end" If everything worked well till here you can 'Edit Connections' in 'Network Manager' and add a new Mobile Broadband connection for the Reliance connection. Networking System Administration Ubuntu Free Software Reliance Mobile Broadband Leave a reply Your email address will not be published. Required fields are marker *
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on 08th December 2011 / by Content Writer
We have released the price lists for ADSL Modem Routers & 3G Wireless Router for the month of March 2012. The prices are given as follows.. Model: Netgear Router MBRN3000 Price: Rs. 7440 Product Description- 3G/4G MOBILE BB WIRELESS-N RTR, Warr- 2Yr. Model: Netgear Router DGN1000 Price: Rs. 3720 Product Description- 802.11N 150Mbps WL ADSL Gateway(ADSL modem+router+AP+4port switch), Warr- 2Yr. Model: Netgear DGN2200 Price: Rs. 6180 Product Description- 802.11N 300Mbps WL ADSL Gateway(ADSL modem+router+AP+4port switch), Warr- 2Yr. Model: Netgear DGND3700 Price: Rs. 13640 Product Description- 802.11N 600 ADSL MODEM ROUTER, Warr- 2Yr. All prices published here are inclusive of taxes and subject to market changes. To know the current prices please contact the Zyxware Sales Team. Hardware Networking Price Lists Leave a reply Your email address will not be published. Required fields are marker *
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on 07th December 2011 / by Content Writer
We have released the price lists for Antennas and Modules for the month of March 2012. The prices are given as follows.. Model: Netgear Module AGM721F Price: Rs. 8370 Product Description- GBIC Module 1000Base-SX Fiber SFP,Giga Interface Converter, Warr- 3Yr. Model: Netgear Antenna ANT2409-2000 Price: Rs. 9920 Product Description- Indoor/Outdoor 9 DBI Ant, Warr- Nil. Model: Netgear Antenna ANT24D18 Price: Rs. 13020 Product Description- Indoor/Outdoor 14 DBI Patch Panel Directional Ant, Warr- Nil. Model: Netgear Module AGM722F Price: Rs. 21700 Product Description- 1000Base-LX GBIC, Warr- 3Yr. Model: Netgear Module AGM731F Price: Rs. 7440 Product Description- GBIC Module 1000BASE-SX Fiber SFP,for high density fiber connect, Warr- 3Yr. Model: Netgear Module AGM732F Price: Rs. 19220 Product Description- GBIC Module 1000BASE-LX Fiber SFP,Connect over 10 km,LC connector, Warr- 3Yr. Model: Netgear Module AGM733 Price: Rs. 152220 Product Description- Prosafe 1000Base-ZX SFP Fiber, Warr- 3Yr. Model: Netgear Module AX741 Price: Rs. 60450 Product Description- Prosafe 10 Gige XFP Module Adapter, Warr- 3Yr. Model: Netgear Module AX742 Price: Rs. 34534 Product Description- Prosafe 24 Gige Stacking Kit, Warr- 3Yr. Model: Netgear Module AX743 Price: Rs. 40920 Product Description- 10GE SFP+ ADAPTER, Warr- 3Yr. Model: Netgear Module AXM751 Price: Rs. 77500 Product Description- 10GB-SR Gige XFP Fiber Module, Warr- 3Yr. Model: Netgear Module AXM761 Price: Rs. 40300 Product Description- 10GE SR SFP+ MODULE, Warr- 3Yr. Model: Netgear Module AXM752 Price: Rs. 145700 Product Description- 10GB-LR GIGE XFP Fiber Module, Warr- 3Yr. All prices published here are inclusive of taxes and subject to market changes. To know the current prices please contact the Zyxware Sales Team. Hardware Networking Price Lists Leave a reply Your email address will not be published. Required fields are marker *