Network Security Assessment by Chris McNab

By Chris McNab

A instruction manual for community adminstrators who have to improve and enforce defense review courses.

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In the case of half-open SYN port scanning when a port is found to be listening, an RST packet is sent as the third part of the handshake. Sending an RST packet in this way abruptly resets the TCP connection, and because you have not completed the three-way handshake, the connection attempt often isn't logged on the target host. Most intrusion detection systems (IDS) and other security programs, such as portsentry, can easily detect and prevent half-open SYN port-scanning attempts. In cases where stealth is required, other techniques are recommended, such as FIN or TTL-based scanning, or even using a utility such as fragroute, to fragment outbound probe packets.

After querying public records, such as web search engines and WHOIS databases, DNS querying can find network-specific information that may be useful. 3 DNS Querying Using tools such as nslookup, host, and dig, you can launch DNS requests and probes against domains and IP address blocks identified during the web search and NIC querying phases. Other tools also perform reverse DNS sweeps against IP network blocks to identify hostnames and other domains. DNS requests and probes can be launched to retrieve parts of, or in some cases, entire DNS zone files for specified domains or network spaces.

Gov. gov. gov. gov. net. gov. net. gov. 194 ;; AUTHORITY SECTION: ;; ADDITIONAL SECTION: ;; Total query time: 10 msec ;; MSG SIZE sent: 25 rcvd: 221 In the overall scheme of things, dig has superseded the nslookup and host commands, allowing users to launch and analyze responses to almost raw DNS queries. gov. 255 IP address network block. 2 DNS Zone Transfer Techniques Perhaps the most popular method for gathering information about all the computers within a DNS domain is to request a zone transfer.

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