- Download & install nmap “self-installer”
.exeand install Npcap when asked by the Nmap installer.
in Cygwin add to
alias nmap="/cygdrive/c/Program\ Files\ \(x86\)/Nmap/nmap.exe"
\(are vital for Cygwin shell to interpret the command correctly
- Open a new Cygwin window to start using
Test nmap Cygwin install
Starting Nmap ( https://nmap.org ) Nmap scan report for google-public-dns-a.google.com (126.96.36.199) Host is up (0.0092s latency). Not shown: 998 filtered ports PORT STATE SERVICE 53/tcp open domain 443/tcp open https Nmap done: 1 IP address (1 host up) scanned in 7.41 seconds
Troubleshooting nmap on Cygwin
- errors about interface → try running Cygwin as Administrator (right click on Cygwin icon).
find interface names available to nmap
- to find servers with a particular port open on a subnet, try this Python code that scans for servers without nmap.
- If you don’t install Npcap when asked in the
nmapdoes not work. Nmap claimed no host existed at a known working IP address.
nmap built into Cygwin?
I think it’s because
nmap requires deeper access to the Windows networking stack that would go beyond the normal scope of Cygwin as a guess.
I have no particular technical familiarity with Cygwin networking at this level, but note that Nmap itself needs the separate program Npcap (forked from WinPcap) to do it’s job on Windows, particularly Windows 10.