Windows 7 keep internet connection after IPSec established

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http://serverfault.com – How I can keep internet connection after establishing IpSec connection to server? I have followed to following link to establihed IpSec server http://rootmanager.com/ubuntu-ipsec-l2tp-windows-domain-auth/setting-up-... then following the below one to connect this server from Windows 7 machine. http://confoundedtech.blogspot.com/2012/07/windows-l2tp-ipsec-vpn-connec... I am able to connect and properly sending data. But after establihing IpSec conenction, my internet conenction is dropped. How I can keep both connection alive? (HowTos)