Is there any way for two laptops that are connected to one wifi obtain different external IP address. What I mean is that when we go to site like ipchicken.com it will show different IP's for both of us. Because now we both see same IP.
Could this be achieved?
In this case, you should attach a switch to the modem, then connect both laptops and the router(wifi) to it. That way you can assign external IPs directly to the laptops. Then attach other devices such as PCs to the router as normal.
Source: http://www.tomshardware.com/forum/40244-42-servers-external-address-router
This video may be of some use: http://www.youtube.com/watch?v=8YFJOCJTkyI It explains the differences between a router, modem and switch and how to use them.
EDIT: Thilo is correct. You will need to request additional IPs from your ISP.
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.
This is somewhat of a general question, is it realistic to assume that a router can resolve any mobile device's MAC address without being already connected via wifi or bluetooth?
If the device is broadcasting, or if it's connected to another access point, then capturing the wifi data would allow you to capture the device's MAC address. Routers aren't generally set up to listen in that way, and I don't think it would be simple to configure that kind of behavior.
In general, if a device isn't connected to a wireless router/access point, you aren't going to be able to capture its MAC.
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.
im wondering if it's possible to create p2p chat application without server(so there is no need in external static ip.Is it true?)?
EddieC is right if the computers are located inside the same sub-network (LAN) or if the computers'ip is their interface to the Internet (WAN public ip). In that case, you can just use the ip's and ports directly.
However, usually, knowing the computers ip is not enough because the machines are located behind routers inside sub-networks. Thus, because the computers are hidden behind the routers, you will have to configure the routers to foward the packets to the right computers as function of the ports used.
Have a look at : http://wiki.vuze.com/w/Port_forwarding
If you do not want to use ip's because they are dynamic, you can configure urls with Dynamic DNS services.
Good luck
It is possible. But you must have someway for one computer to tell the other computer what their IP number is. You could email it to your friend or call them on the phone or post it on a message board.
If this program only has to work on a local network (LAN), there is something called broadcasting which might be of interest to you. It allows a packet to be sent out to every device on the network without having to know their IPs (then other instances of your program could reply with the IP of their machines so you could set up proper connections).
This won't work over the internet, though (imagine being able to broadcast to every computer connected to the internet!).
I have 2 network devices that talk to each other over Ethernet. I would like to sniff the traffic using Wireshark. But the devices are going through a switch. The switch routes the traffic to only the ports that need the data.
At another location I have a hub. All the traffic is repeated across all the ports.
Is there a way to tell the switch to send the traffic down my port also?
EDIT: This is an unmanaged switch.
You might want to look into ARP spoofing.
http://en.wikipedia.org/wiki/ARP_poisoning
Since this is an unmanaged switch, the only way that I can think of is to temporarily put a hub between the switch and one of the devices you want to monitor, then plug a laptop into that hub to do the monitoring. The laptop should now see all traffic between the device and the switch.
This is pretty easy since you can do it at the location of one of the devices. You just need a hub, two more lengths of CAT cable and the computer you are using to monitor with.
The switch may have a management interface that lets you do that. Be warned that if you do, you'll wreck performance on the switch since everything attached to it will now have to deal with collisions.
If the switch is a managed switch, it likely has a mode to act like a hub. Just be careful not to leave it like that.
Some will also have ways to mirror ports and such as well. You need to find out what kind of switch it is.
RE Edit: If it is unmanaged, then you are boned. Use a hub, a managed switch or run wireshark on the computer(s) affected.
You could try a port redirector, like this one. You would configure one device to talk to your computer instead of the other device, and the redirector will send the data to the real target. There are several programs like this out there, or you could write your own.