Patent ID: 7036141
Filing Date: 2006-04-25
Classification: H04L,H04Q

Abstract:
1. A transmission system configured to transmit IP data packets, comprising: an IP network; a protected network protected by a firewall configured to block incoming traffic to the protected network; a first IC-breaker; and a second IC-breaker; wherein said first and second IC breakers are configured to open the firewall to allow the IP data packets to be transferred through the firewall to the protected network; said first IC-breaker is located on a IP network side of the firewall and the second IC-breaker is located on a protected network side of the firewall, and said firewall is transparent to a particular type IP data packet, configured to communicate between said first and second IC-breakers through the firewall by using said particular type IP data packet; said first IC-breaker is configured to receive the IP data packets from the IP network, the IP data packets intended for the protected network, and said first IC-breaker is configured to send the particular type IP data packet to said second IC-breaker after reception of the particular type IP data packet; and said first IC-breaker is further configured to open the firewall for a time period at reception of a returned particular IP data packet from the second IC-breaker, and said returned particular IP data packet is sent before the firewall opens through the firewall to the second IC-breaker, and the second IC-breaker is configured to send the particular type IP data packet to the protected network after receiving the particular type IP data packet; and said particular IP data packet is a ping-packet, wherein said second IC-breaker is configured to identify a size of the ping-packet received from a sender in a form of an IC-breaker, said size being indicative of a type of packet which has been received and a port via which it was received.