2009 Aug 19 - Wed

Debian Dpkg Install

From the Debian Security Announce List, a little short-cut for installing .deb packages:

wget url
        will fetch the file for you
dpkg -i file.deb
        will install the referenced file.

[/OpenSource/Debian] permanent link

IPTables Mangle DSCP

From the Nanog mailing list, a way to force QOS packet marking on outbound packets might look like:

# iptables -t mangle -I OUTPUT -p tcp --sport 80  -j DSCP --set-dscp 0x1a

[/OpenSource/Linux] permanent link

Boost Bind/Lambda replaced by Boost Spirit/Phoenix

Regular users of the C++ library known as Boost will already know about functors, lambda functions, and the like. These abilities mostly originate in the Boost.Bind and Boost.Lambda libraries.

As I'll soon be using the functor capability within my C++ programs, I wanted to make a 'note-to-self' regarding the fact that Boost.Bind and Boost.Lambda have basically been superceded by Boost.Spirit.Phoenix.

The Phoenix library has been accepted into Boost based upon Hartmut's summary of the Phoenix review.

The current incarnation of the Boost libraries is 1.39. Here is the Spirit User's Guide which includes a link to the Phoenix Documentation and a link to the Phoenix Users Guide.

It is noted that FC++ influenced Phoenix, and when looking at the FC++ web site, there is a reference to LC++, which is a Logic Programming language built atop of FC++. I wonder if something similar has been done atop of Phoenix.

An example from the Boost Mailing List of using Phoenix:

#include <vector>
#include <algorithm>
#include <boost/shared_ptr.hpp>
#include <boost/spirit/home/phoenix/core.hpp>

#include <boost/spirit/home/phoenix/operator.hpp>
#include <boost/spirit/home/phoenix/bind/bind_function.hpp>

struct A {};

void foo( const A& ) {}

int main()
{
   using namespace boost::phoenix;
   using namespace boost::phoenix::arg_names;

   std::vector< boost::shared_ptr< A > > vec;

   vec.push_back( boost::shared_ptr< A >( new A ) );

   std::for_each( vec.begin(), vec.end(),

                  bind( &foo, *arg1 ) );
   return 0;

}

Colorized with CodeColorizer.

[/Personal/SoftwareDevelopment/CPP] permanent link

Simple Desktop Network Monitoring Tools

Here are a few simple tools useful on a Windows' desktop for monitoring basic network stuff:

• TCPTraceRoute: mBy sending out TCP SYN packets instead of UDP or ICMP ECHO packets, tcptraceroute is able to bypass the most common firewall filters.
• LFT: Layer Four Traceroute which is mostly non Windows based tool, but partially works in Cygwin.
• Ping Plotter: helps you pinpoint where the problems are in an intuitive graphical way, and to continue monitoring your connection long-term to further identify issues.
  
• SNMP Traffic Grapher: monitor a couple of SNMP values in near real time.
  
• WinMTR: WinMTR is a windows clone of popular Matt's traceroute/ping program called MTR.
  

[/Networks] permanent link