Netem이라는 linux kernel level packet emulator에 관한 것.

packet drop, delay, ... 등등을 간단하게 emulation 할 수 있다.

Kernel 2.6부터 사용가능

참고 사이트 : http://linux-net.osdl.org/index.php/Netem

 - TC 매뉴얼 

invalid-file

Versions: Cygwin CYGWIN_NT-5.1
ACE 5.5.1
g++ 3.4.4 (cygming special) (gdc 0.12, using dmd 0.125)

(cmake is available by cygwin project)

Before making ACE

1. Get and decompress tar ball (e.g. /work/ACE_wrappers).
2. Set an environment variable;

export $ACE_ROOT=/work/ACE_wrappers

1. Create some symbolic links;

cd $ACE_ROOT/include/makeinclude 
ln -s platform_cygwin32.GNU platform_macros.GNU 
cd $ACE_ROOT/ace ln -s config-cywin32.h config.h

Setting include path

Compiling ACE generates many errors by default of cygwin. It is because the preprocessor of g++ on cygwin behaved in a strange way. It regards the lines "signal.h" or so on in /usr/include/*.h files as the same name files in ACE.

Solution: To avoid this errors, you should export an environment variable like:

export CPLUS_INCLUDE_PATH
 =/usr/include:/usr/local/include:$CPLUS_INCLUDE_PATH

and

make

Then you can compile ACE without any errors. This issue is not declaired at the official homepage of ACE/TAO.

Local Installation

To install ACE to your cygwin,

 
cp -r $ACE_ROOT/ace /usr/local/include 
cp $ACE_ROOT/lib/* /usr/local/lib

To tell your cygwin where is the ACE dynamic libraries,

 
export PATH=/usr/local/lib:$PATH"

cygwin cannot search the libraries without setting PATH variable properly. It's a specification of cygwin.

Additional step to test ACE:

cd $ACE_ROOT/tests 
make 
perl run_test.pl