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Questions tagged [nmap]

Nmap (Network Mapper) is a security scanner originally written by Gordon Lyon (also known by his pseudonym Fyodor Vaskovich) used to discover hosts and services on a computer network, thus creating a "map" of the network.

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Help! Whats up with my network?

I've just done a simple nmap scan of my network with nmap: nmap -sP 192.168.1.1-255 networkserver@networkServer:~$ sudo nmap -sP 192.168.1.1-255 Starting Nmap 5.00 ( http://nmap.org ) at 2010-08-26 17:46 NZST Host RTA1320.home (192.168.1.1) is up…
glisignoli
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how to check open ports of bunch of website at once with nmap/linux?

I want to use nmap in such a way that I could check bunch of server's port at once for checking whether their particular port is open or not? right now I have 10 ip addresses but in future this could be more . I know the very basic command in linux…
Vahid Hashemi
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Is it dangerous to allow every user to run nmap as root?

At our university we have some computers in the "networking lab", that are configured to allow everybody to run nmap as root via /etc/sudoers. Could this be a security vulnerability?
Kim
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nmap shows 8080/tcp open http-proxy on centos 7 VPS but lsof shows nothing for that port

Im running a Centos 7 VPS server for the past several years. Originally when I set it up I didnt install any firewall (iptables specifically) because I was under the impression the host (linode) needed them open to admin the box from their side. …
Tim
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VMware Host only networks: Hosts not receiving NULL/FIN/XMAS packets using PFsense router

Setup: 2 host-only ints each connected to a separate host on a separate network PFsense VM routing between 2 networks (implicit accept on both networks, no other rules) Can receive normal, syn,syn/ack,rst/ack, ACK, etc, essentially all the normal…
Jack
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Ufw not showing open port

I'm new to linux and I use ufw to open / close ports on my Debian 11 VPS. If I use ufw stauts verbose I get the following list of open ports: To Action From -- ------ ---- 25565 …
Eldar Omerovic
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Will a web server get blacklisted for port scanning?

As I understand it, port scanning is an activity that can be a precursor to malicious activity, as one of the things it is used for is to scan for open ports that one can attack. In that train of thought, why do sites like the following exist? Won't…
John Doe
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Nmap ssl-enum-ciphers not showing ciphers with specific certificate running MS SQL 2019

I have a server running MS Sql 2019 Std.I have configured MS SQL to use SSL. I have a cert from entrust that when I scan with Nmap --script ssl-enum-ciphers fqdn does not show the TLS version for port 1433. If I switch the cert for MS SQL to one…
lee_in_wv
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How to find Free IP address in a sub range?

We are using below command to figure out the IP addresses which are down (which is free IP address to use) nmap -v -sn -n 192.168.1.0/24 -oG - | awk '/Status: Down/{print $2}' I wanted to get a subrange within that . For example the above command…
Samselvaprabu
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is it possible to intercept only nmap scannings with IPtables?

I'm trying to redirect all scans coming from nmap to another destination. I'm trying IPTABLES, but I have no idea on how to tell apart the nmap scanning from the legitimate traffic. Is it something achievable through IPTABLES or should I look…
Fabio Rovati
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Cannot Open Azure VM (Ubuntu 18.04) Port

Running the jupyter notebook server on port 8888 on the virtual machine. Trying to use port forward to my desktop (running Linux Mint). The server is running on the VM alright, but the port is closed to my desktop. A network sweep gives the…
Della
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can ping but not arping via OpenVPN

I'm working on a remote machine using OpenVPN at a customer's network. The IP addresses there change dynamically and (until they get hostnames to work properly which is not in my hands at this point) I'm looking for a way to find "my" machine…
Cookie
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How do I block port 22 to prevent incoming ssh on Ubuntu?

I'm trying to block port 22 to disallow incoming ssh connections on a Ubuntu VM. I have issued the command: $> iptables -A INPUT -p tcp -dport 22 -s ###.##.##.## -j DROP But I can still ssh into the VM. nmap reports that port 22 is still open. How…
P. James Norris
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Why should I press enter twice to send HTTP request in ncap/nmap?

I need to set up a manual connection with a domain and send an HTTP request. Like this : https://nmap.org/ncat/guide/ncat-usage.html As it mentions I should hit enter twice. But all commands on CMD I have ever worked with were fine with one enter.…
m0ss
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I cant block ACK packets going through port 80

I want to block nmap's ack ping probes and in order to do that, I fist need to block all incoming ack packets coming on port 80. I used this command but it didnt work: iptables -A INPUT -p tcp --dport 80 --tcp-falgs ALL ACK -j DROP The thing is it…
xparks37
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