wanem is a clean web interface which remotely configure the linux traffic control driver (tc). It is a great way to simulate a wan environment for testing purposes.

• automated interfaces discovery
• display the bridge interface associated to native interfaces
• report facing devices name such as reported by LLDP
• report interfaces statistics
• limit bandwidth per interface
• adjust delay, loss and jitter per interface
• built for bridges, does not change your VLAN attribution and IP setup

First, create bridge interfaces on your appliance and connect each bridge interface to two physical interfaces. Configure a real or a dummy IP address on each bridge. Connect each WAN end to a physical interface. Install and start wanem and use the HTML interface to configure the bandwidth, the delay, the packet loss and the jitter of each interface.

apt-get update
apt-get install build-essential ruby bridge-utils lldpd ruby-dev
gem install sinatra --no-ri --no-rdoc
gem install thin --no-ri --no-rdoc
git clone https://github.com/mbound/wanem
cd wanem
ruby ./http_main.rb

On systemd-based distributions, wanem can be auto-started at boot with a simple systemd unit file (provided in the repository). Note that this unit is written with the assumptions that:

• the service will be started as root user
• the http_main.rb is in /home/ubuntu/wanem

Make sure to change both accordingly before installing the unit.

To install and start the unit:

sudo cp wanem.service /etc/systemd/system/
systemctl enable wanem
systemctl start wanem

To check the status:

systemctl status wanem

ruby-dev is not a package, should be installed manually

wget http://security.debian.org/debian-security/pool/updates/main/r/ruby2.1/ruby2.1-dev_2.1.5-2+deb8u6_amd64.deb
wget http://ftp.us.debian.org/debian/pool/main/g/gmp/libgmp-dev_6.0.0+dfsg-6_amd64.deb
wget http://ftp.us.debian.org/debian/pool/main/g/gmp/libgmpxx4ldbl_6.0.0+dfsg-6_amd64.deb

dpkg -i libgmpxx4ldbl_6.0.0+dfsg-6_amd64.deb
dpkg -i libgmp-dev_6.0.0+dfsg-6_amd64.deb
dpkg -i ruby2.1-dev_2.1.5-2+deb8u6_amd64.deb

gem install sinatra:1.4.8
gem install thin
git clone https://github.com/mbound/wanem
cd wanem
ruby ./http_main.rb

Main concern is to stop NetworkManager, which does not support bridging. Then install as follow.

# Stop networkmanager
service NetworkManager stop
systemctl disable NetworkManager.service

yum install epel-release
yum update

yum group info "Development Tools"
yum install bridge-utils lldpd ruby ruby-dev
gem install sinatra:1.4.8
gem install thin

git clone https://github.com/mbound/wanem
cd wanem
ruby ./http_main.rb

Add a @reboot line into the crontab (Note: PATH setup is only necessary for CentOS).

crontab -e
add a line : 
@reboot (export PATH='/bin:/sbin:/usr/bin:/usr/sbin' && cd home/ark/wanem && ruby http_main.rb &> /dev/null &)