摘要：Data security plays a crucial ro le in m odern times most b usiness is tran sacted ov er the intern et andev en to wireless d evices. This paper p resents the v ulnerab ilities fo und in VPN us in g IPsec and su ggested as et of Policy as a Defensiv e measu re. Such p olicy su ggested app lies to im plementations of VPN th at ared irected throug h an IPsec concentrato r and to all com pany's emplo yee, contracto rs, consu ltan ts, temp orariesan d oth er workers includ in g all p erson nel affiliated with the third parties utilizing VPNs to access th eco mpany 's netwo rk
关键词：Virtual Private Network; In ternet Key Exchang e; IPsec; Agg ressive mod e
