Questions tagged [network-scanners]

Programs that map out a network to figure out which computers and services are available to be exploited.

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Xmas Scan Versus FIN Scan

While studying Nmap, I came across different port scans. Out of these XMAS and FIN scan caught my interest. Though XMAS scan sends FIN, URG and RST flags, the response is the same as that of a FIN ...
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1answer
233 views

How vulnerability scanners identify version of services on targets

I would like to know that how vulnerability scanners identify the version of services running on the target after identifying the service by the port number.
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1answer
3k views

Nmap “adjust_timeouts2” error

Just tried a port scan against a cloudflare protected website: nmap -sV --version-intensity 9 --top-ports 2500 -v --script banner --data-length 0 -n <ip address here> -Pn -T2 -sT I get a lot ...
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863 views

Honeypot tricking my android device to connect

I have been facing this issue since a month where a neighbour access point is acting like a honeypot, all the nearby android devices are getting connected to it even after forgetting the network. The ...
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1answer
450 views

Why doesn't nmap return open port info when I fragment packets?

I'm performing a scan on a remote host and playing around with the -f flag for nmap when I noticed something I hadn't expected. In amongst the other data, when I type nmap -v -O <hostname> I get ...
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1answer
325 views

Does netdiscover spoofs ip address?

I am trying to discover hosts in my network. So I have connected external TPLINK wireless card to my virtual computer for internet and when I do ifconfig, it gives me IP address, 192.168.2.6 I used ...
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1answer
855 views

Using xarp on a network

I am slightly worried about getting into trouble... I have installed Xarp and when I opened it, it started listing IPs. I am on a public network, so would it get flagged on the administrator's side??
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1answer
63 views

How to find files accessible on external network?

It was recently brought to my attention that there was a zip file containing a database backup accessible on my external network. Is there a tool that will scan my external ips and return files that ...
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1answer
186 views

How does an attacker compromise a soft switch?

Speaking of soft switches (e.g soft switch in data plane of software defined networking). I've been trying to find a good research paper or article that explains how an attacker can compromise a soft ...
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1answer
514 views

Scan detection Tool better than Snort Portscan Preprocessor

I am working on detection of Scanning activities of Bots/Worms. I have found that Snort Portscan Preprocessor detects Scan activities. I have tweaked Snort Portscan Preprocessor to detect different ...
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1answer
1k views

Snort - Rule: Alert all php requests

I am trying to understand writing rules for snort. Further goal is detection of sql injections like here. I've read the documentation of snort rules and created this rule: alert tcp any any -> ...
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2answers
3k views

Vulnerability scanner inside AWS

I have three VPC's within AWS and I want to run an automated Nmap scan on all three VPC's every few weeks to make sure nothing has been opened, added, etc. What would be the best way to achieve this?
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1answer
337 views

Are there any tools/methods to probe a web app from diffferent IPs?

I am currently reading "Metasploit: The Penetration Tester's Guide" and I came across the following paragraph in the book (in the 1st chapter) During intelligence gathering, you attempt to ...
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2answers
199 views

Internet monitoring and DNS encryption

If someone hides their DNS traffic by encrypting it with a service such as OpenDNS's DNSCrypt, would you still be able to see which URLs they're viewing? Also, if that person uses HTTPS 100% of the ...
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1answer
506 views

Packet-filtering firewall evasion (Scanning)

Context I'm very familiar with different applications of scanning tools (. . . and you can use -mtu to specify the size of the fragments in nmap . . .) but every piece of information I read about ...
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60 views

Is there an updated (non-Nmap) top 100 or top 1000 common ports list?

I know Nmap has nmap-services file which gives us the list of top 1000 ports/services found on the Internet. But this list seems to be outdated, as the Nmap top 1000 list doesn't include several ...
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1answer
47 views

Local Scans initiated from a VLAN Broadcast IP address

Just reviewing some logs and I am seeing local scans to several local IP addresses on port 137 within my network. The source IP however is the broadcast IP of the VLAN (.255). I have checked the ...
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39 views

Router reboots when doing port scan [closed]

This question is very much related to Router reboots when using Nmap, the difference is that I'm actually interested in a practical solution to this problem. I have a piece of C code that is doing ...
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679 views

How secure is my apartment's building wide wifi network using Spectrum Community Solutions?

Recently my apartment moved from having individual modems (with our own router/wifi network) to this Spectrum Community Solutions building wide network. Everyone can connect to the network anywhere, ...
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28 views

Nmap showing different open ports every few seconds [duplicate]

I'm running Nmap on an Amazon Web Services EC2 instance but between runs just a couple seconds apart, I'm getting new results. Is this normal? I'm seeing open ports then they don't show. I'm running ...
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124 views

Router detects my Nessus scan and kicks me off the network [closed]

I'm trying nessus on a public router. When I run a scan on the router at 10.0.0.1, the router somewhat detects it and proceeds to kick me off. If I put targets : 10.0.0.2-10.0.0.255 (scann all ...
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468 views

Connected devices to router are hidden

I was scanning devices connected to my WiFi with netdiscover(Kali linux).I was unable to find any device. I only get Router's IP and MAC address. It does not show any device although i have connected ...
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2answers
237 views

How to find and ban some devices from my wifi using the command line? [closed]

I use Arch Linux. I just installed some packages such as nmap, netdiscover and others. It is a ubiquiti internet network, for the sharing of connection to several routers. There are about 7 routers ...
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0answers
41 views

Is it possible to circumvent (ignore) routing table without root permissions?

The local host is configured to send all non-local traffic to a restrictive firewall VM configured in the routing table (route). Preliminary scanning shows that other routers are available on the ...
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168 views

scapy Deauthentication address understanding

I have the problem to understand from_DS, to_DS with Deauthentication packet, deauthentication packets are type=Managment, FCfield managment and control frames always FROM_DS = 0 , TO_DS=0, ...
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326 views

Nethogs showing several IP addresses and ports - Port sniffing?

I have a small Ubuntu server (VPS from provider with control panel) machine for practice purposes - no production or critical stuff. I've set up ufw and nginx with a sample index.html page. I control ...
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454 views

Nessus Denial of Service checks

What's the difference between the "Denial of Service" plugin family and other plugins with "DoS" in the Plugin Name but located in different families? Can those other plugins also cause DoSs during ...
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1answer
284 views

Network scan for vulnerabilities free tool [closed]

I have a huge distributed network with over 1000 servers and network devices. It is mix of operating systems. I'm looking for some free tool to scan network for SSL v2, SSL v3, RC4,TLS v1.0 and older. ...
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1answer
88 views

IKE/IPsec connection attempt -Is this legal? [closed]

I manage IT for a small school. We have an IPSec tunnel up between two sites. This morning I saw alerts that showed some unknown IP was attempting to negotiate an IPSec/IKE session with my firewall. ...
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3answers
2k views

Where does nikto tool store its default reports?

I ran the nikto security scan tool against one of our dev sites. perl nikto.pl -h mydevsitename The output mentioned 7646 requests: 14 error(s) and 3 item(s) reported on remote host None of the ...
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414 views

Scapy problem in sending packet

I am trying to use Scapy for testing the network. Whenever I send a packet with commands like send, sr ,sr1 I get this message: python.exe has stopped working I am using Scapy 2.2.0 on Windows 8....
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1answer
2k views

Nessus web client: Error 401 invalid credentials [closed]

Previously I used to scan sites using Nessus web client, but when I tried to login with the same credentials I am able to see a401 (Invalid Credentials) error. I have restarted the service nessusd, ...
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1answer
313 views

hping3 - Ignoring not responding ports

Is there a way to ignore the not responding ports in the scan report? james@ahoi:~$ sudo hping3 -q --scan 1-1000 -S 192.168.0.1 Scanning 192.168.0.1 (192.168.0.1), port 1-1000 1000 ports to scan, use ...
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5k views

What is my router listening for on ports 5555 and 3333? [closed]

I recently discovered nmap and pointed it at my router out of curiosity. It found that ports 3333 and 5555 are open but doesn't recognise either service. I investigated and found: I can successfully ...
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3answers
381 views

Nmap scanning single port too fast? Shows as filtered?

I ran into an issue when trying to scan a single port on a single machine. I ran a range scan to find machines with port 25 open. Then I just arbitrarily chose one to work on. I scan that machine with ...
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2answers
4k views

Why doesn't `nmap -sn 192.168.2.1/150` show the hosts that are up?

I wanted to know the hosts that were up on my network. So while working with Nmap I couldn't understand why using the command nmap -sn 192.168.2.1/150 it didn't want to tell me the hosts that were up, ...
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234 views

How much traffic can a firewall node handle? Any real examples? [closed]

As a part of my research, I need to determine the maximum packets (Internet traffic) can one instance of firewall/ IDS process. I am not sure where to begin though. Your assistance and guidance in ...
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3answers
10k views

Which tool (apart from nmap) can I use to scan a range of IPv6 addresses? [closed]

When I try to use nmap: # nmap -sP -6 FE80::1-234 [...] Failed to resolve given IPv6 hostname/IP: FE80::1-234. Note that you can't use '/mask' or '[1-4,7,100-]' style ranges for IPv6.[...] What ...
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784 views

Multiple Open ports on a server, is that safe? [closed]

Using nmap I try to scan a server as a result I get multiple open ports. For example when I try to scan domain.com as a result: 7/tcp open echo 9/tcp open discard 13/tcp open daytime 21/tcp filtered ...
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3answers
369 views

Should we use Microsoft security or defender for securing our WAN network [closed]

I would like to understand much about Microsoft Security Essentials or another antivirus which build in or developed by Microsoft. I'm planning to set up the network for my company and use Microsoft ...
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99 views

Client misunderstanding nmap [closed]

My client wants their public facing IP addresses to be secure, but thinks that running nmap port scans will draw attention from hackers. To settle this once and for all, what do you say?
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1answer
202 views

Is there a way of determining if tor is running on a remote machine?

In most of the companies, IT guys block some sites and by using TOR or other VPNs people walk around these blocks and gain access to blocked content. My question is, assuming TOR is running on ...
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3answers
10k views

Why doesn't Advanced IP Scanner show machine name? [closed]

I am using Advanced IP scanner to view all the machines at my home. However, it just shows me only one machine but not the other. However, I am able to ping to the other machine. The network discovery ...
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1answer
1k views

How can all ports be closed? [closed]

I was faced that, there was an hacker attacking my gmail account. With the help of google service, I got the information about that hacker. Again next day he was attacking my pc. When I scanned ...
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3answers
1k views

Practicing pentesting locally

After watching videos and downloading just about every possible pen-testing tool out there to play around with and learn. How do you setup test beds and practice scenarios to crack? With RE people ...
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2answers
3k views

How to identify a specific operating system with port scans?

According to the implementation of the TCP/IP stack an attacker is able to identify which operating system is running on a network device. Is there any paper or the like according on this topic?
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How to rewrite config files using SNMP?

I scanned a router and found that the community string is public. The write access is also enabled. Now I want to change the configuration of the router. Can anybody tell me about tools and tutorials ...
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1answer
118 views

Firebase ports scanning using nmap

Purely for research purposes used nmap to check security of my application deployed to Firebase. However, there some questions which I can't understand: Why Firebase has open so many ports? Something ...
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1answer
222 views

Malicious IP addresses [closed]

I am looking for updated lists of IP addresses that belong to malware's C&C, botnets, malicious scanners, or other sort of malicious activities. Is there any public database of malicious IP ...
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1answer
314 views

XMAS Scan vs Inverse TCP

Whats the difference between a XMAS Tree scan and an Inverse TCP scan using the FIN, URG, and PSH flags? Are they the same thing? XMAS Tree scans are designed to manipulate the PSH, URG and FIN flags ...