Questions tagged [network-discovery]

Use this tag for questions about discovering the IP addresses, mac-addresses, vlans, or the physical topology of a network.

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Get all reachable IP addresses within a private network [closed]

Is there a way to get all reachable IP addresses within a private network. I know that we can get all active devices' IP addresses within same subnet using arp. I was wondering if something similar ...
Atharwa Adawdakar's user avatar
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Network exposure function in 5G core network [closed]

I want to integrate Network exposure function(NEF) to another core network functions . Is their any one help me how to do that?
solomon Fikadie Wassie's user avatar
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1 answer
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Basic question on 'network history based routing tables'

I have encountered the following sequence of words: 'routing table formed on the basis of network history information'. I know that initially, routers discover neighbor nodes and therby the possible ...
knowledge_seeker's user avatar
3 votes
1 answer
261 views

Does Network Discovery (rfc2461) preclude ARP sniffing?

I'm debugging a system demonstrating intermittent loss of connection. It's loosing entries from the neighborhood cache while there are active connections. Does Neighbor Discovery (rfc2461) require ...
david's user avatar
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How to populate ARP table without having to ping every device individually through the console on a Brocade ICX 7750 switch

I need to make a port-IP diagram and so far the best way to do this seems to be through show arp after consoling into the brocade switch. The arp table is empty however, and the only way I have been ...
Frank's user avatar
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2 answers
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How to find specific device in a network without brute force?

I have an Internet of things (IoT) device with known MAC address, which is connected to a network. First, lets assume that this network is large (subnet 255.255.0.0). Is there any "smart" ...
Veselin Manev's user avatar
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1 answer
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Do we represent software in network physical diagram?

I am working on creating a wireless infrastructure for a production site and as I am creating a physical network diagram representing the structure of devices, subnets etc. in the network diagram. So ...
I Love Stackoverflow's user avatar
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1 answer
215 views

How my neighbour machines in the same network knows my interface ip?

In my local machine if I set the IP address to an interface, how other machines know this and route the packets to me if anyone tries to send packets to my new IP? I am in a private network.
Karthik Nedunchezhiyan's user avatar
2 votes
2 answers
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How does a host know the ip addresses of other hosts on the same LAN?

So as the title say, how does a host know the ip addresses of other hosts on the same LAN? Is there a specific protocol for this? My first thought was that ARP could be used. But ARP seem to take an ...
sandio's user avatar
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-2 votes
2 answers
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How to discover a host when you don't know its mac, ip and subnet?

I have a network switch and I don't know its ip nor mac address nor even subnet. I need to get all this information. Yes, there are tools like nmap and arp-scan, but the problem is they all need an ...
Oleg Yablokov's user avatar
5 votes
2 answers
3k views

Juniper SRX answers all ping requests instead of forwarding

I have about 4 different subnetworks at my place, when i'm trying to ping to static device in subnetwork1 from subnetwork2 i always see that device pings, even if it's off. I assume my SRX300 answers ...
Nufay's user avatar
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1 answer
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Is this computer a threat? On same network range, but in a workgroup

We have a normal on-premise Class C network with an internal IP address scheme of 192.168.15.x (hypothetical). We have a SonicWALL device that acts as a VPN server for external clients, a DHCP server ...
Disco's user avatar
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1 vote
3 answers
71 views

How to detect passive network host? [closed]

I have a big network that contains hosts of different types (industrial, computers,servers,iot,etc.). All the hosts are within the same central building. I need to identify all the hosts passively, ...
HDH's user avatar
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2 votes
1 answer
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Network discovery and establishing connections within Eduroam, a network split in subnets

For our current project we are supposed to create a peer2peer (no server) game application which is played by a teacher and his students on the Eduroam network. The concerns of the stakeholder ...
Haverdale's user avatar
3 votes
2 answers
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Understanding how devices on a LAN/VLAN discover the existence of other local devices

Let's say you have a brand new 192.168.1.0/24 network that consists of a router, switch and two hosts (H1 and H2). H1 would like to communicate with H2, but since this is a brand new network and no ...
ahelton's user avatar
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What are the key advantages and disadvantages of NDP compared to ARP?

So why they didn't use ARP in IPv6? is there any real benefit of doing this? what are the key advantages and disadvantages of using NDP instead of ARP? (In overall network performance, Security and ...
John P's user avatar
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Are these hosts Live?

Situation : Along with other active hosts, our internal network scan shows an extra 9 IP addresses in the report (no reverse DNS, just IP addresses) with 0 vulnerabilities and 2 INFO INFO1 : Nessus ...
Sreeraj's user avatar
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2 votes
2 answers
255 views

GHOST servers or devices in Vulnerability scan report

Our Nessus tool scans a few subnets covering about 1000 hosts. Post-scan, Nessus generates the report listing various vulnerabilities of ~600 hosts. In the list of that ~600 servers, 9 of them are IP ...
Sreeraj's user avatar
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1 vote
2 answers
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Can not capture DHCP offer with wireshark?

I'd like to capture DHCP packets with wireshark. When I use the filter: "udp.port == 67 or udp.port == 68" I only see the Discover and Request broadcasts. While I thought the DHCP offer also gets ...
Woenktoenk's user avatar
1 vote
2 answers
181 views

Network topology discovery with Flows

I am trying to understand is it possible to discover Network topology with Flows. I know it is possible to do topology of SNMP ARP/*DP data but I am wondering maybe it is possible to get exact result ...
Gen's user avatar
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2 votes
2 answers
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DLEP vs LLDP for communication devices discovery

I'm looking for a simple way to allow a router discover communication devices over a LAN. I've heard a bit about DLEP and LLDP, but aside from understanding that LLDP is older, and DLEP has only ...
DannyL's user avatar
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2 answers
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Given a network switch, can we identify the devices (IP not assigned yet) connected to it? [closed]

If IP is not assigned to the server yet and suppose it is connected to a switch, then can we still get the details of the server from the switch?
Pavan Rajan's user avatar
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1 answer
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Two different public IPs [closed]

I'm using Jenkins in my company, one master node and two slaves hosted in the office. master on hosted Google Cloud VM. To improve security, I created a restriction so only our office Jenkins slaves ...
Greg Rynkowski's user avatar
3 votes
2 answers
257 views

Why traceroute is still Used?

currenty I'm reading an article about 'Paris traceroute' , as i understood The Classical Traceroute give inexact information about the path that a packet traverse , 'incorrect links , missed nodes '....
jean jack's user avatar
1 vote
1 answer
233 views

How can IPv6 host know default router's IPv6 address using RA?

I know an IPv6 host will send Router Solicitation (RS) messages, and a router on the link will reply Router Advertisement (RA) messages. In the RA message, there is the Source Link-Layer Address and ...
qin's user avatar
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3 votes
7 answers
13k views

Cant ping & access HP switch on network connected on trunking mode

I have been facing this problem for a very long time. Here is a diagram of the switch situation: The problem is that I have been trying to access the switch on the RIGHT(A3100) through the network ...
FreezY's user avatar
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1 answer
91 views

Find all printer on the network [closed]

Is there a way to find the IP address of network printers? I search in google but I did not get a solution. Is there a method or application?
M. Rostami's user avatar
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1 answer
645 views

how to discover devices in a large heterogenous network with huawei, cisco, alcatel and more different devices without using snmp?

i have a huge task to do and i need your help.I am new to the whole networking world and I apologize if this is a re-post of a question. so what i wanted is to discover and mapping all my enterprise ...
billz_the_king's user avatar
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1 answer
6k views

tracert command return Request timed out

I am trying to understand how tracert works, I did a ping www.google.co.nz, found out Google's server IP is 172.217.25.131 tracer 172.217.25.131 I got the following screen of information Can I ...
Yu Zhang's user avatar
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1 vote
2 answers
181 views

How does equipment know it has devices connected to it?

I was wondering how Ethernet equipment (for example a switch) knows that something have been plugged in and is up ? Is there a pair of copper wire dedicated for that ? Or a bit exchange ? On which ...
Thomas Barbier's user avatar
1 vote
3 answers
270 views

How would I make a client find a server with an unknown IPv6 Address?

Let me first explain my situation: I am currently in the process of trying to build a solution for managing multiple Internet of Things devices on a network. It should be possible to automatically ...
Michael G.'s user avatar
0 votes
2 answers
418 views

Finding the Ip address of a pc hogging the bandwidth in a switched environment

We are going to set up a new office in a new location our concern is that if there is a network flooding or too much bandwidth is being used can we identify the culprit without DOS'ing the in-house ...
NetAdmin's user avatar
1 vote
1 answer
87 views

Draw physical link map from configuration

I'm trying to generate a map of the physical network just from the configuration of every item in the network (switch, router). But the only way I found to be sure an Equipment is plug to another is ...
pwnsauce's user avatar
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1 vote
0 answers
495 views

How to send a snmpget request to a remote router? [closed]

I need to get the IP routing table from a remote router which is not situated on my network, got this from http://www.sharontools.com/online-lab/device/?q=cisco-r2 i have enabled snmp and created snmp ...
kumarD's user avatar
  • 111
0 votes
1 answer
1k views

Getting URL of a website using a sniffer [closed]

This is my first post here. I am currently working on a project, and I am supposed to get the URL of a website I am browsing using a sniffer (such as wireshark). So, what I have done is look at the ...
Idan Toker's user avatar
2 votes
3 answers
4k views

How can I discover Apple TV's on my network? [closed]

I have tried Googling for Apple TV and ports, and I've even reviewed the List of TCP and UDP ports on Wikipedia, and I can't find the information I need. Is there a TCP port that all Apple TV's ...
KeyszerS's user avatar
  • 336
2 votes
1 answer
2k views

What is null authentication in WLAN and why is it required?

I was reading about the DISCOVERY operation phase for an RSN. There a diagram shows NULL Authentication (Second Part, in the diagram). What is it and what is the use? The image is from the book, ...
Ugnes's user avatar
  • 178
1 vote
2 answers
66 views

Connecting internal network to public server

I want to implement the following scenario. I have an application that is hosted on a public server. My requirement is that I want make the internal network visible to the application. E.g http://app....
Airbourne's user avatar
4 votes
1 answer
317 views

How would I track down what port a device is on remotely?

Good day all, Suppose I am monitoring a large network and do not have physical access to the devices and want to find out what port a device is on. What are some techniques I can use to help ...
user30558's user avatar
1 vote
2 answers
55 views

IPsec packet path with tunnels

Could you tell me if my assumptions are correct and what happens in the last scenario? Say I am trying to ping an 192.168.x.x. address: Scenario 1: If my local network is 192.168.x.x, then IPsec ...
mccormickt12's user avatar
1 vote
0 answers
48 views

Is error checking included in asynchronous transmission?

A couple of notes I read from said that asynchronous transmission does not include error checking as part of its protocol. Yet parity checks are used in asynchronous data transmission.
user27050's user avatar
1 vote
1 answer
87 views

How to get the IPv6 [closed]

I'm in a network that provides both IPv4 and IPv6 for the nodes, and i have the IPv4 of a machine. How can I find the IPv6 assigned for this machine?
Henrique Almeida Marcomini's user avatar
3 votes
1 answer
1k views

What is persistent connection and session

There is one thing I still cannot understand is persistent connection and sessions. I will explain how I understand all network stuff. Physical layer . This is just voltage levels going through ...
ketazafor's user avatar
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1 vote
1 answer
788 views

What happen underneath when I manually change my IP address?

When I move into a new dormitory, the network manager in the network center tells me my IP address, DNS address, gateway address, and stuff. I was told to just plug in my cable, enter these addresses, ...
walkerlala's user avatar
1 vote
1 answer
990 views

What Is Host Discovery ( port scanning)?

I've read up on Nmap's website on host discovery but i'm still confused on what it actually is and does. There's a syn scan I did on an IP address and then a syn scan without host discovery. The ...
Benn's user avatar
  • 61
3 votes
1 answer
178 views

Switch Trafficking

I'm running a simulation in Riverbed modeler, and I've got two broadcast domains, each having one Ethernet advanced hub and 16 Ethernet advanced stations connected to it through 10Base-T links. ...
Pouya Ataei's user avatar
0 votes
1 answer
162 views

What kind of packets do tools like nmap use to discover other hosts on the network they are scanning?

There are lots of tools like nmap and I am using one for android that discovers every (?) host on the network that I am connected to. I do not understand what kind of packets are send by the program ...
yoyo_fun's user avatar
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0 votes
2 answers
566 views

How to work with Loopback address 127.0.0.1? [closed]

127.0.0.1 is used as loopback the address to one's own computer. But how can it be done ? Is it possible for creating a local webpage using this address.? And what kind of a server do we need for ...
Shivam Naik's user avatar
3 votes
3 answers
6k views

I can't ping the other router using OSPF protocol, Why?

I built a simple Network with 2 routers, the problem is that i cant reach to other router, somehow there's problem i couldn't figure out. here is the configurations: Router0: Router1: doesn't work....
ahmad fakeer's user avatar
3 votes
1 answer
762 views

Manual setting MTU still needed today?

Symptom ssh to remote-host works. Simple output like ls works. But more output like find / fails. Solution In our case we reduced the MTU to 1200 on eth0 (IPv4) and the symptoms disappeared. ...
guettli's user avatar
  • 141