I have a really silly question but I was wondering how I was supposed to find the device IP I linked to my computer thanks to a rj45 cable.
Thanks for helping
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I'm new to ROS, wish someone can answer my stupid question.
I have a static IP 140.113.xxx.xxx, and a 4G dongle with floating IP 192.168.8.100. I want to use ROS to transmit data between them. Can ROS do that? Because I found some website said ROS can only transmit data in the same Internet domain, but I think this must have some trick to solve this problem.
this has nothing to do with ROS.Theses are IPs in two different networks, you either create a propper routing or you give a second device an IP in the same net. However 192.168.x.x should not be used in the internet or any other non private networks
Not sure if I should ask this question here, but this is a technology community so why not.
I'm running a local network which is setup like this:
Modem -> Access Point -> Switch -> Server/5 other computers
and my problem is the 5 other computers only two computers can have access to the internet (which are connected though Ethernet).
Also, any device that's connected to my wireless network can't access the internet either.
I know it's not a problem from my ISP since two computers are connected to the internet. And I know it's not a wireless problem since my local server can be reached though the access point.
I'm not sure what is the problem since I replaced all the cables, devices, and done tons of resets.
Appreciate your help, or direction to where I can get help.
Thanks all, but my problem was that I used static IP and didn't assign more than three, two computers and a printer. completely a beginner's mistake.
I don't know if you are familiar with computer networks but I think it's a network problem. Maybe your router (modem) can provide only two IPs and that's why only two computers can connect the internet. To verify this you can check what is your IP, and what is your Subnet Mask. Type ipconfig in your cmd and give me your IP and the subnet mask to check if this is the problem or not.
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.
I want to send signals to a Phillips Hue Bulb from an Arduino Ethernet, but using only a local network. This means I plan to have a router with an Ethernet connection to both the Arduino and the Hue's bridge, but the router has no connection to the Internet. I read their API's page: http://developers.meethue.com/howhueworks.html and from that I think this could work, but I would like to be sure before buying a Hue kit. Anyone who owns one could assert this will indeed work?
Thanks!
Yes this will work :)
You only need internet to update the firmware of the bridge or if you want to control your lights from outside your own network.
You do need a way to find the ip address of your bridge though. So it's probably easiest to give your bridge a static ip or configure your router to always give the same ip to your bridge.
There is a lot of history here, so please bear with me.
Our home network used to be fine when we were with Comcast, but we wanted better speed and reliability, so we switched to FIOS. At that point, the Wifi connections from my Raspberry Pis stopped working. I got frustrated after a couple of weeks of trying to discover the cause of the problem and eventually put it aside.
The other day, I started to configure a new Raspberry Pi 4 that I plan to use on my new Sphero RVR. I set it up following the usual directions and the Pi connects to the Internet without problem over WiFi, but I can't ping it from my Windows 10 desktop.
So I started digging. I downloaded the Fing app onto my Pixel 3 Android phone and looked at the network. I immediately noticed that all the devices now have a 10.29.179.xxx addresses. That easily explains why I can't ping from my PC to the Raspberry Pi. They aren't in the same address space.
I did discover that I can ping the Raspberry Pi if I use the IPV6 address. I can even get PuTTY to connect using the IPv6 address, although I was unable to successfully login. I don't know what is causing the login problem, but it's probably something mundane.
I suspect that I can make my Rpi conform to the rest of the network using a static IP address, but that might cause problems if I take the robot somewhere else to demonstrate what it can do. What I would like to understand is why most of my network, using DHCP, is on the 10.x.x.x network and the Raspberry Pis seem to wind up with 192.168.1.xxx addresses.
One further wrinkle. We have two routers, the FIOS router, and a LinkSys WRT1900AC, which is the router on which WiFi is enabled.
I suspect this problem is caused by having the two routers or by something inherent in the way the Raspberry Pi interacts with DHCP.
I would like for my Raspberry Pi to configure with an IPv4 address I can use, no matter what network I am connecting it to, and I'd like to understand why this problem is happening in the first place.
Let me know what additional information you'd like to see.
* Additional Notes *
As to the comment that I have not done research. I spent a week reading through stackoverflow problems and reading up on documentation of DHCP without finding the answers to my question. I do not ask questions idley. I ask questions when I cannot find answers and need the help of people more expert than myself in the areas in which I am having trouble.
I have solved the login problem. It was a stupid password mistake.
So now I can login, over wifi, using the IPv6 address, but not with the IPv4 address.
On the FIOS router, both the 2.4 and 5GHz wifi channels are turned off.
As suggested by Ljm Dullaart, the problem was that there were two DHCP servers on the network. After I turned off the FIOS DHCP, my problems went away.