Bandwidth Management with Squid

Squid is free and opensource proxy server/cache server software. Squid is normally run on the operating system GNU/Linux. Squid also has advantages regulate and restrict bandwidth based on the extension, for example, a server is configured to limit the client uses only 100kbps bandwidth to download files ending in .flv, .avi, and so forth.

Get to the stages of installation:

• I recommend to install squid from source, so it can be configured at compile, because by default squid does not support delay pool as a regulator of bandwidth.
• To obtain maximum performance, create a separate partition with a size of about 300MB, name the partition "/cache" (without the quotes).  
• Add/create a user "squid" into the system:
  

  useradd -d /cache/ -r -s /dev/null squid >/dev/null 2>&1 

• Download squid source using the link below (as of this writing, the latest release is version 1.3.11 squid) :

  http://www.squid-cache.org/Versions/v3/3.1/squid-3.1.11.tar.gz

• Extract the file .tar.gz :
  

  tar xzpf squid-3.1.11.tar.gz 

• compile and install squid, installation folder is /opt
  

  ./configure --prefix=/opt/squid --exec-prefix=/opt/squid --enable-delay-pools --enable-cache-digests --enable-poll --disable-ident-lookups --enable-truncate --enable-removal-policies

  make all
  make install

• edit squid.conf (located in /opt/squid/etc/squid.conf). Example : http://pastebin.com/WRNULTWX
• configure squid folder :
  

  mkdir /var/log/squid/
  chown squid:squid /var/log/squid/
  chmod 770 /var/log/squid/
  chown -R squid:squid /opt/squid/
  chown -R squid:squid /opt/squid/

• execute squid command to create the cache folder :
  

  /opt/squid/bin/squid -z

• run squid :
  

  /opt/squid/bin/squid 

Squid will run on port 3128.

reference: http://www.faqs.org/docs/Linux-HOWTO/Bandwidth-Limiting-HOWTO.html