Intrusion detection system/intrusion prevention systems (IDS/IPS) are network security appliances that monitor network for unusual or suspicious activity. Lisa Bock covers ways to evading IDS, such as cloaking with decoys, spoof you MAC address or your IP address, or using and idle scan or Christmas tree attack.
- [Voiceover] Intrusion detection systems,…intrusion prevention systems are…network security appliances that monitor…for unusual or suspicious activities.…An intrusion detection system may be…a stand-alone device or integrated within…an adaptive security appliance or router.…Intrusion detection works out of band…to identify malicious activity,…log information about this activity, and report it.…Intrusion prevention does the same thing…but works in line and attempts…to block or stop a possible attack…by dropping the suspect traffic.…
Scanning a system to check for live hosts,…generally you have a unique signature,…and these can be picked up by intrusion…detection systems and firewalls.…Careful scanning involves avoiding detection…by an intrusion detection system.…For example, when port scanning,…resist the urge to send thousands of packets,…as that in itself is noisy and a clear pattern.…In order to change the pattern,…various techniques can be used.…We can cloak with decoys.…
When scanning, use the Nmap dash D option.…
This course investigates the scanning tools and techniques used to obtain information from a target system, including specially crafted packets, TCP flags, UDP scans, and ping sweeps. Lisa Bock discusses how hackers can identify live systems via protocols, blueprint a network, and perform a vulnerability scan to find weaknesses. She also introduces some of the tools and techniques that hackers use to counter detection via evasion, concealment, and spoofing. In addition, learn how to reduce the threat of tunneling, a method hackers use to circumvent network security.
Note: Our Ethical Hacking series maps to the 18 parts of the EC-Council Certified Ethical Hacker (CEH) exam (312_50). This course maps to the 03 Scanning Networks domain.
- Scanning overview
- Port scanning countermeasures
- Scanning and querying DNS
- Scanning with ICMP
- Mapping (or blueprinting) a network
- Scanning for vulnerabilities
- Using tools such as hping and NetScan
- Evading detection
- Concealing your network traffic
- Preventing tunneling
Skill Level Intermediate
1. Scanning Overview and Methodology
2. Identifying Live Systems Using Protocols
3. Blueprint the Network
4. Vulnerability Scanning
Commercial and free scanners3m 17s
5. Scanning Tools
6. Evading Detection
7. Concealing and Spoofing
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