nmcli without Network Manager GUI

nmcli 

nmcli con down id VPN_CONN_NAME
nmcli con up id VPN_CONN_NAME
nmcli con

automation with nmcli

network-manager restart

sudo service network-manager restart


To automatically connect VPN.

put "nmcli con up id VPN_CONN_NAME" in .profile (upon login)

Packet crafting and sniffing with Python extensions

• libpcap: sudo apt-get install libpcap-dev

• download and install pypcap, dpkt, dnet
• pypcap 's installation is tricky: download the pyrex and recompile the pcap.pyx file will work. Furthermore, use Makefile instead of setup.py seems fixed issues.