In the current information sharing systems, there is a problem of firewall penetration. As for this problem and based on the existing TCP and UDP penetration schemes, we analyze all kinds of possible transmission environments in practical applications, and then present a technique of UDP coordinating with TCP to penetrate firewalls. Finally, we present the realization of this method: a network switch --XIPSwitch, which is independent from various applications. The realization method can further solve the firewall penetration problem of the internal terminals in the existing information sharing systems.