Data across the network isolation between the two net exchange exchange system, remote access to the Internet through the VPN based on national commercial password algorithm implementation now access, e-government network terminal to implement access control across two network access to ensure effective isolation, it is strictly prohibited to any equipment directly mapped to the two network IP or double nic directly connected, each sentence is what meaning, need how to implement? In the case of only exchange fleet what equipment you need to add, for big solutions,