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Questions tagged [network-discovery]

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

4
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2answers
82 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 ...
1
vote
1answer
40 views

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 ...
1
vote
3answers
40 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, ...
0
votes
0answers
61 views

Mobile Country Code (MCC) and Mobile Network Code (MNC) associated with an IP address

I am looking for a way to deduce/estimate the Mobile Country Code (MCC) and Mobile Network Code (MNC) associated with an IP address. From an IP address, I am able to find the associated Country and ...
2
votes
1answer
53 views

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 ...
2
votes
2answers
344 views

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 ...
1
vote
1answer
581 views

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 ...
0
votes
1answer
46 views

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 ...
2
votes
2answers
76 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 ...
1
vote
2answers
2k views

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 ...
1
vote
2answers
145 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 ...
2
votes
2answers
257 views

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 ...
0
votes
2answers
53 views

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?
0
votes
1answer
69 views

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 ...
2
votes
2answers
217 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 '....
1
vote
1answer
126 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 ...
2
votes
7answers
4k 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 ...
0
votes
1answer
59 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?
0
votes
1answer
525 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 ...
0
votes
1answer
3k 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 ...
1
vote
2answers
166 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 ...
1
vote
3answers
107 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 ...
0
votes
2answers
267 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 ...
1
vote
1answer
73 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 ...
1
vote
0answers
276 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 ...
0
votes
1answer
801 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 ...
2
votes
3answers
2k 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 ...
2
votes
1answer
1k 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, ...
1
vote
2answers
59 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....
4
votes
1answer
126 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 ...
1
vote
2answers
37 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 ...
1
vote
0answers
41 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.
1
vote
1answer
70 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?
3
votes
1answer
484 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 ...
1
vote
1answer
325 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, ...
1
vote
1answer
622 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 ...
2
votes
1answer
118 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. ...
0
votes
1answer
97 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 ...
0
votes
2answers
204 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 ...
2
votes
4answers
2k 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....
3
votes
1answer
392 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. ...
2
votes
1answer
613 views

Is it possible to build a fully functional LAN without any router, only with a switch?

I have used Link Local protocol several times but only to link two computers or a computer and another device to transfer files via FTP. But does Link Local protocol work for multiple hosts. Let's ...
1
vote
1answer
66 views

whats the best way to check if my API connection is SSL using network monitoring tools? [closed]

I have a Java based system and it is using an API for additional features, the API has a built-in SSL connection on you just have to enable it in the code, and I was able to enable it but I still want ...
1
vote
1answer
265 views

How to get real source address of a packets in NAT'd VM [closed]

Host OS Ubuntu with live IP address 1.2.3.4 . And a Ubuntu VM running in Virtual Box with NAT network configuration. I need to SSH my VM from external network with IP address 3.3.3.3 . So I configure ...
1
vote
1answer
74 views

Change device - Reassign static IP

I have a setup for a workstation consisting of a PC, monitor and a networked laser printer. The PC uses DHCP to get an IP, but the network printer must be assigned a static IP due to a requirement ...
1
vote
2answers
141 views

How come my gateway have different subnet ip

I have connected to a wifi network i have assigned with an ip:192.168.5.125 subnet:255.255.240.0 . but my gateway is in 192.168.0.1 how could this possible? And i have observed my friend's ip he also ...
-1
votes
1answer
99 views

Beginner Learning Material [closed]

I want to begin to learn about the basics of networking. Is there any networker's 'bible' or high regarded very entry level reading material I can begin to read? Thanks in advance
1
vote
1answer
74 views

Why are there so many different Network File Systems & File Transfer Protocols? [closed]

I've been spending a lot of time trying to learn different Network File Systems & File Transfer Protocols etc. in order to integrate three different devices with three different Operating Systems: ...
2
votes
0answers
259 views

Windows 7 PC getting unidentified network and no network access on 1 wifi [closed]

Good afternoon guys. I have a Dell precision 4800 Laptop which is most of the time hooked up to the LAN at the users desk. Out on our production floor we have 4 Access Points, each on their own VLAN ...
4
votes
2answers
18k views

How to calculate sample RTT? [closed]

I am new to networking and figuring out that how to calculate sample RTT which will be used later to calculate estimated RTT, Here's my assigned problem: Suppose that TCP's current estimated values ...