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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

VTBL or VPTR nothing but virtual table and virtual pointer in C++. It gets created when we create function with virtual keyword. As soon as we create the virtual function in a class A table gets created behind the code. BaseClass { virtual void function1(){...} } ChildClass : public BaseClass { virtual void function1(){...}// method overridden. } When we override method that is create another version of function in derived class ChildClass in above case then the *_vptrvirtual void function1(){...}// method overridden. gets created for BaseClass. So VTBL Of Base Class has entry for function1 and Child class will be pointing to that function. *_vptr is nothing but the pointer to function. Note: ones the virtual keyword is introduced all the upcoming functions are considered as virtual. ChildClass: public BaseClass { virtual void function1(){...}// method overridden. void function2(){} } In above case function2 also considered as virtual. BaseClass will not be pointing t

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

SMB write performance can be increased by Tuning the buffer cache. The secret to good performance is to keep as much of the data in memory for as long as is possible. Writing to the disk is the slowest part of any filesystem. If you know that the filesystem will be heavily used, then you can tune this process for Linux Samba. writing out dirty blocks to the disk until the filesystem buffer cache is 80 percent full (80). default is 40%, source = http://tldp.org/LDP/solrhe/Securing-Optimizing-Linux-RH-Edition-v1.3/chap29sec287.html by writing echo 80 > /proc/sys/vm/dirty_ratio I am getting around 2MB increase while write operation, tested in Xp. I have tried with this single option, as the ref source is for linux 2.2 and we are using 2.6 kernel. we can try out Linux General Optimization suggested at http://tldp.org/LDP/solrhe/Securing-Optimizing-Linux-RH-Edition-v1.3/gen-optim.html Tried with smb.conf, I am getting around 1MB gain while read and write. socket options = TCP_NODELAY I