So I my ISP assigns local private IP address to devices on the network, I found that by checking the IP address assigned to my phone's ccmni0 interface which I believe is the one used to connect to the network.
And so I tried sending a message to my other phone (which uses a SIM card from the same network provider as the other, so I assumed they are on the same network) using the local IP assigned to it. I was expecting to receive the message on the device but didn't, that's why I suspect the reason might be because they use different cellular technology (one 3G and the other 4G).
Please tell me if my suspicion is true or not. And guide me if I have done anything wrong.
Related
I am wondering what is the best way to reveal all IP addresses to devices that are plugged into a switch, that is then plugged into an EdgeMax Router 4 by Ubiquiti. I attempted to use the nmap command on linux to reveal all devices behind 192.168.1.1/24, which is the address that the switch is plugged into, but only some devices came back. I was searching for the IP address of an OpenBMC device connected via the switch, but I couldn't find it.
The switch is a basic TP-Link gigabit 8 port switch (SG-1008D) and to my knowledge and research, it doesn't appear to have a web console or interface to reveal IPs there. And when I log into my EdgeMax Router 4, I only see devices at the router level.
I am not the most versed in networking knowledge, but I did a few things first to research. If anyone has any further suggestions on what else I could try, please let me know.
Only layer 3 switches have the ability to display the IP address of the devices directly connected to them. Your SG-1008D is just an unmanaged switch and it will not be able to display the MAC or the IP address of the devices connected to it. You will be able to identify the MAC and IP address of the devices connected to the switch by running network tools such as Angry IP Scanner or by looking into the connected devices list of the router. But that will not show you the ports where the devices are connected to in the switch.
Well the situation may seem to be complex but here it is.
I have a computer X. It is connected to gateway 1. Another computer Y is connected to gateway 2. Gateway 1 and 2 are themselves connected to a super gateway G which is connected to Internet.
This is actually the setup of my college network. The college uses a gateway (G) to distribute IPs to hostel rooms (Each room gets one IP). Since I have 2 computer (My PC and my Raspberry Pi (X)), I need to use a network switch (gateway 1) to connect to internet. Similarly my friend in the adjacent room has a network switch which connects his laptop (Y). The Raspberry Pi (X) has LAMP server and the laptop Y wants to access its content. How is this possible? What address should be entered in the web browser? How will the browser know which address does it points to?
Another question is : If I directly connect my laptop to Gateway G, then I have to login first to access the Internet. Can I setup my network switch in such a way that it automatically logs into the Gateway G so that I don't have to login when my computers are connected? My network switch is D-Link model AES-1005A.
First, a switch is not a gateway (router). There is a big difference. Each device you connect to your switch is getting its own IP address from DHCP, else it wouldn't work.
You don't get one IP address per room since that is not how DHCP works, There may be a switch between Router G and your rooms that limits the number of MAC addresses per port. If that is the case, you are out of luck, otherwise your friend should try to connect to the address assigned to your Pi by DHCP.
Network switches only operate at layer-2, so any upper-layer protocols like the login are completely transparent to it, and you cannot have it log in for you. Your Pi may actually need to log in, too, to get an IP address from DHCP.
You seem to be trying to bypass the network policies or security of a network that doesn't belong to you. In many jurisdictions, this is a crime (usually, a felony), so you should tread very carefully.
Also, since this doesn't involve programming, it is actually off-topic here, and you should really ask on Super User.
I'm app developer from Korea.
Let me have one supposition.
There is one PC and one android tablet.
these devices are in same network.
(192.168.0.x ...same in C class)
My question is same as followings
"using PC, how can I find another device by the device's MAC address only?"
I know there are network protocols including UTP , TCP/IP ....
which one should I use ?
and What algorithm should I use?
Please Help.
Thank you so much for reading.
I would suggest just passively listening until the device sends a packet. As soon as you see a packet with that MAC address as its source, its source IP address will (most likely) be that devices IP address. The specifics of how you promiscuously monitor a network vary by operating system.
The most portable way to do it is probably to attempt to communicate with ever IP address in the subnet, checking the operating system's ARP table to see if you found the right MAC. This requires non-portable code only to pull the ARP table. It's unpleasant if you happen to find yourself on a /16 subnet -- that's over 65,000 IPs with broadcast traffic needed for each one of them.
There's probably a better way to solve your outer problem, whatever it is.
Is it possible to determine programmatically what jack on a network switch a computer is connected to?
It's either possible or not possible, depending on the switch.
If it's a managed switch, you could query its management interface to determine the MAC addresses behind each port. Then you could match that up with the hardware address on the computer you're interested in.
Some switches have discovery protocols (such as CDP or LLDP) which will broadcast the port's identity to whichever devices are attached. You could sniff the network for these packets to determine the port your computer is connected to.
You can try disonnecting them one by one and each time testing if the network connection goes down.
To identify switch port connected to your pc ; you need to manually access the switch and remove ur rj-45 cable so you can visualize any port having state of disconnection.. dm gui can be used if switch is managable
cdp and lldp wont work for pc as it doesnt support it
I would like to write a software running in a networked device, i.e. PC. It can automatically detect the other network devices' types. For example, it can detect there is a PS3, a Wii, an IPad running in the same network. Any ideas? Thanks,
You have two problems: first, detecting that a device is connected to your network and at 192.168.1.x. Second, somehow detecting what that device is.
The first is easy-ish to accomplish: there's discovery protocols like UPnP and Bonjour. However, in a home networking scenario, the easiest and most reliable way to get a list of connected devices is probably to pull the DHCP reservations from your router. You might have to scrape data from the router's HTML-based management interface—hacky as that may be—but it would work. (If you're using .NET, consider the HTML Agility Pack to accomplish this.)
Once you have a list of IP addresses of connected devices, your next problem is to figure out what each device actually is. This will be more challenging. Some possibilities:
You may be able to use the MAC address to help detect the device's vendor. (Here's a list.)
If you're using UPnP, you can ask the device what it is.
Use IP fingerprinting to determine what the device is.
Couple thoughts. The broadcast IP address - 255.255.255.255 is where devices talk and say "here I am". Should be able to listen to this and find ip addresses and more. Second, if devices are assigned an IP address by a DHCP client (obviously) you can usually find a list on the dhcp device. Devices often have names, this is a higher level protocol, like windows SMB, that you may have to interface with in order to get that information.