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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Windows AdvFirewall and nmap scans

I come from a Unix background but got the task of configuring a Windows firewall on a public facing server. I find awkward that any nmap scan I perform against the public IP reports all TCP ports ...
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242 views

Apache SSL not accepting outside traffic

Running Apache 2 on Ubuntu 11 in Amazon EC2. Tried to add a new SSL VirtualHost by doing the following: Added "Listen 443" to ports.conf. Added new VirtualHost in my enabled site and "SSLEngine on". ...
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199 views

how can I view all of the machine/host names on a network

I am trying to find a reliable way to view all of the host/machine names on a local network, so for instance "Jim's Ipad" or "Austi's IMac". At the moment the only way I can do it is by looking ...
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105 views

nmap not outputting one line to console when using -oG

when I run: nmap --open -sT -p 5900,3389 -oG test 10.0.1.121 This outputs to console: Starting Nmap 5.00 ( http://nmap.org ) at 2013-02-15 16:31 PST Interesting ports on 10.0.1.121: Not shown: 1 ...
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1answer
626 views

How to check if an IP address is free on a network

I'm gonna setup a Wireless router for a customer. They have subnet 10.253.48.0/24 What can I do to check if the IP 10.253.48.243 is available to set up the router? I'm on out on a local network at my ...
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2answers
287 views

nmap configuration file [closed]

I'm running Linux mint and I need to modify my nmap configuration's default service enumeration by making a new service list. I think I do this in the config file (I'm not positive), but I can't seem ...
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7answers
2k views

Scan for connected, powered on computers on a network?

I want to scan for powered on computers on my LAN and gather logs about that. I tried nmap but it didn't work very well (a lot of switched on computers are not getting detected). nmap -sP ...
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2k views

Issue with Netgear GS108T Managed Switch and Jumbo Frames

I recently purchased a Netgear GS108T managed switch and I am trying to configure jumbo packets between my NAS (Thecus N4100Pro), PC and managed switch. I should mention the fact that I was able to ...
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1answer
179 views

using nmap to guess remote OS and probe service details on a single port only

I am looking at scanning with nmap a large network in order to identify the OS of devices (-O--osscan-limit) probe for details of a service on a single port (I would have used -sV for all open ...
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2answers
452 views

nmap scan only state of port

Is it possible with nmap to check only the state of a port whether- open, closed or filtered and NOT the services behind it? The aim is to speed up scan results. Since UDP scan is also involved it is ...
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3answers
344 views

Command line tools for ping HTTP? [closed]

Background : It's a common question as we can search at google "ping works but http does not" ping is not a reliable test of network connectivity. ping working just means enough of the IP stack is ...
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863 views

Why is port 444 open on this router?

I have a Cisco RV110W. I ran nmap at it from the outside and nmap reports that the router has tcp port 444 open. Yet there are no port forwarding rules specifying this port. It should as far as I can ...
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2k views

Nmap ping scan over a VPN tunnel return all hosts alive?

I'm curious as to why running an nmap -sP (ping scan) on a remote subnet linked via a Cisco site-to-site IPSec tunnel returns "host up" status for every IP in the range. [root@xt ~]# nmap -sP ...
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1answer
73 views

how can I verify whether multiple ip addresses are hosting on same server? [closed]

Many hosting providers put multiple ip addresses on same physical machine. If I have two ip address, for example: 192.168.1.100 and 192.168.1.101. If I can only send probing packets from afar, how can ...
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3answers
1k views

VirtualBox guest responds to ping but all ports closed in nmap

I want to setup a test database on a vm for development purposes but I cannot connect to the server via the network. I've got Ubuntu 12.04vm installed on 12.04 host in Virtualbox 4.2.4 set to - ...
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96 views

Nmap SYN Scan blocks all connections?

I have ServerA (running Ubuntu 12.04 (IP: 10.10.10.200)), a KVM DomU of an also Ubuntu Dom0 that is trying to perform a scan against ServerB-ServerZ (Mixed OS (IPs:10.10.10.20-199)) using the command: ...
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2answers
648 views

Check open port: 6129 filtered

I've started a security audit on my server and with a simple nmap scan I discover the situation below: Starting Nmap 5.21 ( http://nmap.org ) at 2012-10-31 17:14 CET Nmap scan report for ********* ...
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2answers
2k views

Test if an IP is being used in an internal network without using nmap

I can perform port scan using nmap to test if a given IP is being used, e.g. nmap -PR 192.168.1.9 However, nmap is not installed in most server, is it possible to have the same result (e.g. check ...
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1k views

What's going on with traceroute?

The following is what happens when I run traceroute from a certain location: # traceroute google.com traceroute to google.com (74.125.227.39), 30 hops max, 60 byte packets 1 ...
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2answers
1k views

Weird Port scanning results using nmap

I was scanning one of my friends servers using nmap and got these port details. PORT STATE SERVICE 22/tcp open ssh 42/tcp filtered nameserver 80/tcp open http 111/tcp open ...
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1answer
2k views

Using nmap to scan open ports. iptables default policy affects other rules?

I'm trying to find out why changing my default iptables policy is affecting what nmap sees when it scans my host. Consider the following iptables setup: iptables -F iptables -A INPUT -p tcp -s ...
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1answer
950 views

NMap route determination on Windows 7 x64 [closed]

C:\Windows\system32>nmap --iflist Starting Nmap 6.01 ( http://nmap.org ) at 2012-08-31 06:51 Central Daylight Time ************************INTERFACES************************ DEV (SHORT) IP/MASK ...
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2answers
169 views

Ubuntu 12.04 slow reply to nmap

We've upgraded some of our servers to 12.04 recently, and i've noticed that when I run nmap from some other server to check open ports on these 12.04 servers it take WAY longer than before. is this a ...
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3answers
2k views

How to list down hosts with nmap 5.51

I was using nmap 5.21 with the -PN, -F and --reason flags in version 5.21. I was outputting the results to an XML file. It would list ALL hosts (say I gave it a /24 subnet to scan. I then updated ...
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570 views

Powershell and NMAP Information Sharing

I am working on a project where I would like to perform host documentation for a variety of items. Part of these items would be sourced from Powershell and the rest would be sourced from NMAP. For ...
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283 views

pingdom like service to constantly monitor my firewall open ports

I have pingdom setup to constantly make sure my websites are up and let me know when they are not. Is there a similar service that will constantly monitor my firewall externally, and let me know when ...
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2answers
4k views

Nmap not scanning all ports

I've noticed that nmap only scans a bunch of known ports, and the only way i've managed to check 'em all is to put a "-p 0-65535" in. Why is that? am I wrong? is there a more popular way to scan all ...
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1answer
274 views

Automatic/scheduled check for open ports on list of servers

I need a way to configure a scheduled check for open ports on a list of servers and to get notified if something has changed from last check. what's the best way to do it? If there is some solution ...
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2answers
4k views

nmap does not find alive hosts with ping scan

I try to ping scan my local network using nmap, but it doesn't seem to find machines that are for sure alive. It responses to ping but on to ping scan. Results for ping: $ ping 192.168.0.2 PING ...
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2answers
160 views

646/tcp open unknown

when I make nmap localhost I get PORT STATE SERVICE 22/tcp open ssh 25/tcp open smtp 111/tcp open rpcbind 631/tcp open ipp 646/tcp open unknown what is the port 646 ?
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731 views

What's the difference between http-proxy and ccproxy-http?

Good day, After execution command nmap -p 8080 myserver.address I've got this message PORT STATE SERVICE 8080/tcp filtered http-proxy And aftar nmap -p 808 myserver.address I've got PORT ...
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926 views

Can't Ping host, nmap detects it?

I have a simple question that I'm trying to wrap my head around. I know this requires knowledge of my internal network, but at a glance, what do you guys think.. I cannot ping a host in my network ...
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776 views

While using Nmap and sweep the network with a ping

I'm studying up on using Nmap, and there is a command that sweeps the network with a simple Ping scan to determine which hosts are online. The command is this: 1 [ignore_this]# nmap -sP 10.0.0.0/24 ...
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4k views

finding live hosts with nmap

I'm trying to find live hosts on the network with nmap: nmap -sP 192.168.3.0/24 Starting Nmap 5.21 ( http://nmap.org ) at 2012-04-10 10:28 EEST Nmap scan report for km-localhost (192.168.3.1) ...
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431 views

IP ID Sequence Generation

Perchance someone could explain me or give point me in the right direction to achieve understanding of "Busy server or unknown class" in the nmap output? "IP ID Sequence Generation: Busy server or ...
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603 views

Why is nmap now taking a long time to perform subnet ping? [closed]

I've been using the nmap tool on my Windows machine to ping my Uni house home network range using the following command: nmap 192.168.1.0/24 -sn I had no problems with this and it was only taking ...
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2answers
1k views

IPtables: is there a minimum UDP packet size for a DNS lookup?

IPtables for a virtual dedicated server. I would like to block UDP scans and I was wondering whether there's a minimum packet size for a DNS lookup? Nmap sends 0-byte UDP packets (source : ...
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1k views

Port is open on machine A but it is not visible from machine B in Nmap

I have a virtualized CentOS machine with a software that is listening on port 8080. I have turned off SELinux and flushed all iptables (so now there are no rules set). I have checked with netstat -nap ...
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5answers
14k views

How to find out that SMTP server is in open relay?

I used nmap for network security testing. It found that SMTP server was in open relay. Here is the output: nmap --script smtp-open-relay testwww.confidesk.com PORT STATE SERVICE 25/tcp open ...
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3answers
217 views

Windows Server 2008 Standard, firewall disabled by Group Policy but ports are still filtered

Hihi, So vanilla install of WS2008R2S, disabled FW with GP and trying grab SNMP with another host on the same subnet. The output of both if/ipconfig's and nmap -p 161 is below. Both machines running ...
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1answer
409 views

Detecting network state with arping

I am developing system for detecting network actual state. One part is to get all IPs and their respective MAC addresses. Right now I am using arping in DAD (Duplicate Address Discovery) mode. I send ...
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2answers
240 views

Removing new fingerprint detection message from nmap

I run a nmap scan of my hosts daily to check for open ports. sudo nmap -f -sS -sV --log-errors -append-output -p1-9999 host.com But along with the output I get a long list of fingerprint ...
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2answers
577 views

Nmap / Batch: alert if only ports usually closed are opened?

Context I check open ports on my server with a scheduled batch file: nmap.exe server1 server2 server3 etc >> log.txt Usually 21, 22, 80, 443 and 3389 are opened. Now I want to send an email ...
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46 views

Managing the Network from a linux machine

I am using Linux at my work, and i am kind of a sys admin / IT support, (not exactly my title but i do this kind of things since there is no one else). There are mostly Windows user in my organization ...
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192 views

nmap external localhost with iptables

I have a status monitor that I wish to set up using nmap to show all my externally open ports. Naturally nmap came to mind. Unfortunately I use an iptables firewall and allow all traffic on the ...
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5k views

iptables has port 80 open but nmap shows it closed

I'm having some troubles getting a Debian webserver to open up port 80 for HTTP traffic. In my iptables, I opened up port 80 using the following commands: iptables -A INPUT -p tcp --dport 80 -j ...
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1answer
135 views

Identify where a port is blocked

I'm trying to find out where a port is being blocked by a firewall; either en-route to a host or by the host itself. If I run nmap I can see that the port is filtered. However, this could mean by the ...
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1answer
781 views

Running nmap over vpn on Mac OS X 10.7 Lion fails

When connected to VPN (I have used OpenVPN and TunnelBear VPN service) nmap stops working. Ping, nc and other network tools work however nmap doesnt. When not running vpn, I get: $ sudo nmap ...
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228 views

Why is my IMAP port not showing as open ( yet it works? )

Ive recently setup Postfix and Dovecot IMAP on a Debian Lenny box. Sending to this domain works fine and reading the email via IMAP works fine too. I'm curious though as to why when running nmap, port ...
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232 views

Process killing trouble

I am trying to program a server software which involves a lot of testing on java / scala platform. Whenever i compile and execute the code. It starts listening on port 80. Sometimes i need to ...