My Tech notes

Some of the most useful commands related to iptable , To display filter table rules. #iptables -t filter -L To display nat table rules. #iptables -t nat -L To display raw table rules #iptables -t raw -L To display mangle table rules. #iptables -t mangle -L To delete all rules in the filter,nat,raw and mangle table. #iptables -t filter -D #iptables -t nat -D #iptables -t raw -D #iptables -t mangle -D Set up IP FORWARDing and Masquerading # iptables --table nat --append POSTROUTING --out-interface eth0 -j MASQUERADE The above rule will do source nating. ( It will set eth0 IP address as source address for all outgoing packets on interface eth0.) # iptables --append FORWARD --in-interface eth1 -j ACCEPT Port forwading # iptables -t nat -A PREROUTING -i eth0 -d --dport -j DNAT --to The above rule will change the destinationIP:portnumber of the incoming packet to private.IP:portnum Enabing the packet forward in the kernel with proc entry. #echo 1 > /proc/sys/net/ipv4/ip_forward iptables ...

Few questions on dotnet, C# 2.0, 3.5 On Object oriented concepts 1)What is inheritance with e.g 2)What is polymorphism -function overloading -Function overriding -virtual keyword use -Static keyword and use -Abstract classes -Interface -Object 3)What is threading and how do we use in realtime application(cognizant) 4)What is threadpooling, lock, monitor(write code sample) 5)Architecture of current project 6)Session state, diffrent types of state management. 7)What is Application_Start, how it works. 8)Type of authentication in asp.net 9)How to configure ASP.NET application. 10) What is Impersonation. 11) What is WebService, WSDL, UDDI, Discovery, asmx files. 12) How to implement WebService and use it. 13) When to use WebServices. 14) WPF, how to implement(BOA) 15) Testing concvepts. 16) Test attributes 17) Flow of Automation Test Method execution 18) Features of dotnet 3.5 19) CLR, garbage collection 20) Finally block 21) Manifest, Metadata, MSIL 22) Assemblies, Type of assemblies, str...

how to unzip .torrent files? You do not need to decompress .torrent files. The .torrent will disappear from the end of the file once the file has finished downloading onto your computer. Then you can use the file as you see fit. It may be a .mp3 file, a .zip file, etc to use bittorent, you need a client. then open the .torrent file in azureus and you will download the file that the torrent is for. the .torrent isnt the file itself, it just tells the client where to get the file. Here are some popular torrent clients for windows. Download Azureus at Azureus Azureus - now called Vuze - Bittorrent Client Requires Java for Windows; if you are first time installing http://java.com/en/download/inc/windows_new_xpi.jsp Few more popular bittorrent clients for windows http://www.utorrent.com BitTorrent | BitTorrent Check out Comparison of BitTorrent clients - from Wikipedia, the free encyclopedia BitTorrent is the name of a peer-to-peer (P2P) file distribution protocol, and is the name of a f...

Example usage OF Creating & Working On a CVS Branch Tried working hard on CVs commands, here is simple example for working in branch using CVS, CVS is becoming nomore use with everyone opting for SVN, still CVS usages is wide as it is old, Lets start with CVS commands to create a branch This is done with two commands, cvs tag -b release-1 //create branch cvs update -j release-1 //merge the changes in main tot Lets see with simple example Creating and working on a branch for the existing kernel source. #cvs co kernel/linux-2.6.26 #cd kernel/linux-2.6.26/ #cvs tag -b release-1 First we created a branch to the kernel source, as we are doing first release. Continue your development work for second release. After some time, reported a problem in the first release. So you need to Get the kernel source code of first release. #cvs co -r release-1 kernel/linux-2.6.24 and fix the problems Now If you want to merge these changes in to main trunk. #cvs update -j release-1 And you are done with ...

Xilinx is the world's one of largest supplier of programmable logic devices. It has started R & D department in Hyderabad, India. It has broad scope for embedded system programming in device driver in linux. Before the interview you have to feel the Xilinx form with information containing all academic details, current/previous employer, contacts of employer( to check out info about you), current ctc, expected ctc and expected date of joining, etc. I appeared two back to back technical interviews. The first interview was taken by a young man look like just crossed 30's. He asked me to tell me about myself. Then he asked my experience. He checked my expertise in resume. He asked questions about RTOS, and Linux Device Drivers. What is RTOS ? Define it. How a linux device driver works? How a character driver works? He looked at my project summaries and started to ask in depth questions about each project. After that he asked me to write to delete nth node from starting in Sing...