For example, TCP or UDP can overlap the destination port, and then penetrate the overwhelming majority of the firewall, and may bypass the NIDS. You can also overlap TCP flags, the NIDS can not correctly detect the TCP FIN packet, so that the NIDS can simultaneously monitor soon reach maximum number of TCP connections; the NIDS can not correctly detect the TCP SYN packet, so that the NIDS can not detect should have the TCP connection. If the NIDS can not be TCP stream reassembly, TCP segments can be bypassed by NIDS. Some unusual TCP segment will confuse some NIDS. Sent in error in the TCP sequence numbers, sending duplicate serial number, reverse the order of such transmission, it is possible to bypass the NIDS. Attacker to send OOB data is protected if the host application can handle OOB, the NIDS can not accurately predict the received OOB host to be protected when the number of normal data buffer, so may bypass the NIDS.
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