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Installing ns-3.37 and ns-3.35 in Ubuntu | Ubuntu 22.04 | NS3

Multiple Versions of ns3 in Ubuntu 22.04 In this post, we are going to install two versions of ns3 namely ns-3.35 and ns-3.37  My OS is : Ubuntu 22.04 LTS (Long Term Support) ns-3.35 uses waf and (./waf --run scratch/first)  ns-3.37 uses cmake  (./ns3 run scratch/first.cc) So we will install both the packages  Go through the video for complete instructions To start with  $ sudo apt update  $ sudo apt install build-essential autoconf automake libxmu-dev g++ python3 python3-dev pkg-config sqlite3 cmake python3-setuptools git qtbase5-dev qtchooser qt5-qmake qtbase5-dev-tools gir1.2-goocanvas-2.0 python3-gi python3-gi-cairo python3-pygraphviz gir1.2-gtk-3.0 ipython3 openmpi-bin openmpi-common openmpi-doc libopenmpi-dev autoconf cvs bzr unrar gsl-bin libgsl-dev libgslcblas0 wireshark tcpdump sqlite sqlite3 libsqlite3-dev  libxml2 libxml2-dev libc6-dev libc6-dev-i386 libclang-dev llvm-dev automake python3-pip libxml2 libxml2-dev libboost-all-dev  I have downloaded both the versions of ns3 fr

How to Set Cookies in PHP

To Set cookies using PHP, setcookie() function is used. Cookie is a piece of information that stored in the client’s machine (usually browser) by the server.

setcookie() contains 6 parameters

  1. Name of the cookie- usage- “FirstCookie”
  2. The value of the cookie. This value is stored on the clients computer; do not store sensitive information. Assuming the name is ‘Iamthecookie’, this value is retrieved through $_COOKIE['Iamthecookie']
  3. Expiration time of a cookie- usage – time()+60 //means that current time + 60 seconds,
  4. The path on the server in which the cookie will be available on. If set to ‘/’, the cookie will be available within the entire domain . If set to ‘/osp/’, the cookie will only be available within the /osp/ directory and all sub-directories such as /osp/bar/ of domain . The default value is the current directory that the cookie is being set in.
  5. The domain that the cookie is available. To make the cookie available on all subdomains of example.com then you’d set it to ‘.example.com’. The . is not required but makes it compatible with more browsers. Setting it to www.example.com will make the cookie only available in the www subdomain.
  6. Indicates that the cookie should only be transmitted over a secure HTTPS connection from the client. When set to ,  the cookie will only be set if a secure connection exists. The default is 0. On the server-side, it’s on the programmer to send this kind of cookie only on secure connection.

<?php

$c=setcookie(”name”,”Iamthecookie”,time()+100, “/”,”.eadhoc.com”, 0);

if($c)

echo “The cookie set successfully”;

else

echo “Cookies may be disabled or not set”;

?>

The above script sets a cookie of name ‘name’ and value being ‘Iamthecookie’ which will be available for 100 seconds, and it is for the entire server eadhoc.com and it is not secure (as it uses 0 – HTTP)

to delete the above said cookie,

change the code to

<?php

$c=setcookie(”name”,”",time()-100);

if($c)

echo “The cookie deleted successfully”;

else

echo “Something Wrong”;

?>

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