Linux kernel 2.4 used a TTL of 255, or the sys admin may have changed it in /proc/sys/net/ipv4/ip_default_ttl. There are exceptions of course, so it’s not always accurate. The default TTL for Windows is 128, whereas Linux and Mac OS is 64. It’s all in the TLL (time-to-live) value, which indicates how many hops a packet can take before dying, hence ‘time-to-live’. Nmap Cheat Sheet Nmap Target Selection Nmap Port Selection Nmap Port Scan types Service and OS Detection Nmap Output Formats Digging deeper with NSE. Sorry for the clickbait, but actually you can (most of the time) detect a remote OS with one simple trick, the ping command. Detect the OS with This One Simple Trick! This can trick non-stateful firewalls in giving up information about a ports’ state. The first command sends a null TCP flag, the second one sets the FIN bit, and the last one sets FIN, PSH, and URG bits. If ACK scan shows some ports as filtered then it is likely a stateful firewall. Timing (How quickly it scans to avoid detection) RND:# Number of random IP addresses to use. The IP address(es) you want to use as the decoy. This will make the scan appear that it’s coming from another IP, such as the sys admins host. If you look closely at Trinity’s output, no OS was matched. In this case a TCP SYN scan, also known as a Stealth Scan. This provides additional information when verbose mode is used, such as the time of scans, and number of hosts and ports scanned. But have you wondered what -sS does, or -O? I thought I’d share my cheat sheet which may come in handy if you need a quick reference for TryHackMe or HackTheBox.įirst, a quick breakdown on the command Trinity used: nmap -v -sS -O 10.2.2.2 Yes that’s right, the Nmap command in my header image was the same as Trinity used in The Matrix Reloaded (2003).
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