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This paper deals with identification of operating systems (OSs) from the Internet traffic. Every packet injected on the network carries a specific information in its packet header that reflects the initial settings of a host's operating system. The set of such features forms a fingerprint. The OS fingerprint usually includes an initial TTL time, a TCP initial window time, a set of specific TCP options,...
IPv6 is being deployed but many Internet Service Providers have not implemented its support yet. Most of the end users have IPv6 ready computers but their network doesn’t support native IPv6 connection so they are forced to use transition mechanisms to transport IPv6 packets through IPv4 network. We do not know, what kind of traffic is inside of these tunnels, which services are used and if the traffic...
This paper examines the detection properties of obfuscated network buffer overflow attacks by selected IDS and NBA. The obfuscation was performed by tunneling the malicious traffic in HTTP and HTTPS protocols with the intention of simulating the usual legitimate characteristics of the HTTP traffic's flow. The buffer overflow vulnerabilities of four services were used: Samba, BadBlue, Apache, DCOM...
Future networks may change the way how network administrators monitor and account their users. History shows that usually a completely new design (clean slate) is used to propose a new network architecture - e.g. Network Control Protocol to TCP/IP, IPv4 to IPv6 or IP to Recursive Inter Network Architecture. The incompatibility between these architectures changes the user accounting process as network...
In this abstract, we investigate the network traffic that may cause the unauthorized control of a computer in the campus network using buffer overflow attacks, the objective of which is to gain the control of privileged programs and computers. We provide statistics of the network traffic in a campus and an eterprise network together with probabilities of a buffer overflow attack to provide attakers...
Network monitoring is an essential task of network management. Information obtained by monitoring devices gives a real picture of the network in production including transmitted data volumes, top hosts, a list of frequently used applications etc. Deep analysis of data collected by monitoring can reveal network attacks or detect misuse of network services. In addition, Data Retention Act requires each...
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