Questions tagged [broadcast]

Broadcast refers to sending a message to all devices on the same LAN.

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Receive UDP packets from multiple broadcast servers

I have two sensors which broadcast their data using UDP. I configured them to use different ports. If I connect only one sensor, I receive the packets using nc -ul port without any trouble. If I ...
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1answer
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Understanding DHCP discovery specific subnet

I am learning networking and in class we are talking about DHCP. I understand that when a host just joins a network it does not have an ip yet so it sends out a dicovery message. we are using ...
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Linux: does “tcpdump -A udp port 65000” have an equivalent using netcat?

I'm trying to listen to UDP broadcast packets which are being sent to the local network's broadcast address on port 65000. Using tcpdump, I can use tcpdump -A udp port 65000 to see the packets, which ...
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1answer
721 views

When is the broadcast MAC address and broadcast IP address used in a network?

I know that to discover the unknown details (IP/MAC) in a network the broadcast address is used. For example: DHCP client broadcasts request to get network detail from DHCP server, one host gets MAC-...
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What happen underneath when I type 255.255.255.255 in web browser?

I've learnt that 255.255.255.255 is broadcast address, then I'm curious what happen underneath if a web page element src is http://255.255.255.255 or I type 255.255.255.255 in url bar, will it ...
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Does a MAC-layer broadcast on Wi-Fi get sent to each client directly, or through the router?

I'm trying to find a way to get my Android device to send frequent Wi-Fi packets into the air so I can detect them from multiple base stations for interior positioning. The canonical way to do this ...
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115 views

Send phone audio output to PC without affecting phone mic? [closed]

I want to be a game streamer and use my phone to play mobile games. Therefore, I need to send my phone's sounds to my PC. I found a tutorial that suggested using the 3.5mm headset jack and a USB sound ...
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1answer
3k views

Block ARP requests (or broadcast message, if possible) from A SPECIFIC HOST in a subnet

My ISP provide username-password for authentication and also register the client's MAC address for authentication. I am concerned about someone misusing my connection while I am not using it. ...
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Disable terminal broadcast messages in Linux

I am relatively new user to Linux on the desktop and have recently started to connect to several work/personal VPNs using the following command: sudo systemctl start openvpn-client@Personal This all ...
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1answer
208 views

Does UDP broadcast translate into 802.11/Ethernet broadcast?

Setting 1: 1 master access point and 2 slave stations with 802.11 chipsets. Setting 2: 1 master PC connected to 2 slave PCs through a switch and Ethernet cables. Scenario: An application running at ...
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Stream a MP3 to a media device on a schedule

With a lack of a wired PA system we are utilizing speakers connected to few Linksys RE6700 devices (that we were already using as WiFi extenders) to make audio play in different areas of a building. ...
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2answers
392 views

FIle Transfer broadcasting

I am curious are there implementations where one can send a file over a broadcast address like in IPv4 addresses to multiple end hosts? For instance can scp perform a file Broadcast to multiple hosts ...
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Why don't all computers show in Net View?

This is for a Windows environment. Either in a workgroup or domain environment, why don't all computers show up in Netview or Network (via Explorer)? Assuming all computers are online and pingable, ...
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Problem playing games using OpenVPN that use broadcast packets. Other games work, hosts can ping each other

I'm running an OpenVPN server in bridged mode and clients can successfully connect, see shared folder and play LAN games that let you enter the LAN IP address. However I'm unable to play games like ...
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1answer
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Can I disable the broadcasting on this machine?

I've been given access to a Windows Server 2008 R2 Enterprise machine that was provisioned like this: network 1.2.3.136/30 gateway 1.2.3.137 IP 1.2.3.138 broadcast 1.2.3.139 netmask 255.255.255.252 ...
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Directed broadcasts to other than own IP subnet are received until socket shutdown - why?

My two hosts reside on the same Ethernet segment. Host A is 10.1.0.1/16, host B is 10.1.0.2/16. A sends directed UDP broadcasts to 10.1.255.255 and a UDP listening socket bound to INADDR_ANY on B ...
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1answer
770 views

Address LAN computers by name over Open VPN

Using OpenVPN client on Windows 7 laptop to access my home network. Workgroup on the laptop is "MyWorkgroup". Home network: Wifi router on 192.168.1.1 - Linksys EA6500 with USB hard drive plugged ...
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Why change the IPv4 default broadcast address of a particular network?

Some operating systems allow the user to change the broadcast address of a network, e.g. in Linux this can be done by using the SIOCSIFBRDADDR ioctl. Why is this necessary? In which scenario would an ...
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685 views

IPv6 link-local multicast vs. IPv4 broadcast

I know that there is no broadcast in IPv6. However, there is the concept of link-local multicast using the ff02::1 IP address, reaching all hosts in the very same local network. So what is the ...
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2answers
410 views

Remote shutdown of a group of linux servers (SNMP/Bonjour/socat?)

I have a group of linux servers on my subnet that I want to be able to remotely shutdown from a master machine. I don't want the non-master machines to have to coordinate with the master in advance, i....
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1answer
150 views

CDP broadcast questions in a standard AP

Let say I have radio 1 connected to radio 2 in wireless. Then the two radios send a CDP packet to each other. What will happen on a Access Point. Is there any standard for those APs in the markets? ...
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1answer
2k views

What happens when an ARP Request arrives to an Ethernet switch?

I remember reading somewhere that switches defined "data link layer broadcast domains": that is, data link broadcasts from one network connected to the switch are not forwarded to the others. If this ...
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1answer
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how do I setup my D-link DSR250n to use openvpn server

My aim is to make my Iphone connect remotely (and securely) to my home network and get from the DHCP (the d-link router) IP on the same subnet. This is because I have an client app that broadcasts on ...
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1answer
428 views

Broadcast address for address 144.16.95.255?

A subnetted Class B network has the following broadcast address : 144.16.95.255. Its subnet mask (a) is necessarily 255.255.224.0 (b) is necessarily 255.255.240.0 (c) is necessarily 255.255.248.0 (...
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Unable to ping broadcast address

Host address: 192.168.0.13 Network: 192.168.0.0 255.255.255.0 Router: Cisco DPC3825 DOCSIS 3.0 Gateway (user manual) My home network uses the 192.168.0.0 /24 network for my (mostly wireless) devices. ...
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2answers
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Is this subnetted IP address valid?

I'm learning subnetting at the moment and I'm unsure whether this is considered a valid IP address. 150.16.5.255/21 My teacher asserts that this is invalid because it is a broadcast address of one ...
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2answers
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i want to broadcast the audio (livestream) from pc 1 “line in” through pc 2 via network “LAN”

i want to broadcast(livestream) the audio from pc 1 "line in" through pc 2 via network "LAN" because i have no available built in audio interface in pc 2..
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1answer
5k views

What is the exact use of a limited broadcast address?

I read that limited broadcast addresses will be dropped by the router. So, it's not used in the layer-3 (Network layer), where IP addresses are meant to be used. So, where exactly is it used?
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1answer
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How to override wifi broadcast speed limit?

In the 802.11 protocol broadcast happens at minimum speeds (usually 1 Mbps) since there is no ACK system to know if the packet has been delivered successfully. But I want to broadcast a video stream ...
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1answer
137 views

Script/program that listens for user input, reads logs for output and sends broadcast

During code deployments there is a risk of service/system failures. The Network Operations Center monitors alerts from servers. If the alert comes as a result of a code deployment then it might not be ...
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1answer
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Subnetting Difficulty

Taking the following example shown in the first image, why has my teacher has assigned in the solution (image 2) for network one (N1): 7+2 hosts? Shouldn't it be 6+2 since the number of hosts in that ...
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How to send a netbios broadcast

I am testing some feature of a firewall and I want to send a netbios broadcast packet out. How do I this? I tried nbtstat -A "ip-addr" but this sends a unicast message not a broadcast.
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235 views

Is it possible to get a router’s IP address from a Wi-Fi signal?

Is it possible to get a router’s IP address from a Wi-Fi signal without having to connect in, given that it's broadcasting Wi-Fi, but requires a WPA password?
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Why broadcast ping takes longer than host ping

I have a simple question. I have read that when I'm pinging broadcast address in LAN every device responds to ICMP Echo Request and console shows first(quickest) response. But when I pinged ...
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Is it possible to do keystroke broadcasting across a LAN on a Macintosh?

I have done the keystroke broadcasting in Windows like if I press any key in one PC the same key will be broadcast to another PC on the LAN. I wonder if there is anyway to use the same technique on a ...
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1answer
2k views

Multicast and broadcast networks and routing

I am using my computer for watching TV and also for internet browsing(listening to youtube, soundcloud, etc.). For watching TV I am using m3u playlist, with a IP addresses from multicast network(e.g. ...
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Home router config to allow for UDP broadcast

I have a homegrown piece of software that "listens" to UDP traffic at 255.255.255.255:5010. It works just great on my home network, but does not work on other people's networks. I think that my ...
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How to create a wireless-to-ethernet router?

I have a Debian machine, which I want to turn into a router. It will connect via wireless to a access-point, where it will get an IP. To its ethernet port, other machines will be connected. It will ...
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1answer
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Broadcast screen on LAN (wifi) to many clients

I would like to know if the following is possible, and how to go about it if it is: I want to lecture using my laptop in front of 100 students, each with their own laptop. I want my screen, or part ...
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2answers
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Windows IP address cached even after cable unplugged?

I have a PC which connects to a network by both wired cable and wireless. Of course, it has 2 IP Addresses : 192.168.5.111 and 192.168.5.112. (Subnet mask 255.255.255.0) As usual, the PC picks the ...
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1answer
260 views

Multiple cams broadcasting service

I want to set up three cameras at a wedding and stream them to the world. preferably so the viewer can see all three at once, but audio from one. I want to both broadcast live and save it to disk for ...
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2answers
23k views

From where do I get a reply if I ping broadcast address 255.255.255.255 from a router

When I do a ping to the broadcast address, I get reply from self-loopback 127.0.0.1. Is this scenario correct or should I get reply from the longest-prefix IP? ping 255.255.255.255 PING 255.255.255....
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How to use a key binding within shell script ? (Launch terminator in broadcast mode in background)

I currently use a small shell script to start a terminator window as a background process which has multiple splits specified with a layout. terminator --layout=My_layout & I want to execute a ...
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2answers
574 views

Communicate with a device with an IP set to a broadcast address

I have a wireless IP camera that I am setting up to use for Timelapse purposes. When configuring a static IP selected 192.168.0.255 so as to be memorable, I latter found out (after I couldn't connect ...
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What is ICMP broadcast good for?

To configure Linux to ignore ICMP broadcasts (to protect from SMURF attacks), I have added the following line to /etc/sysctl.conf: net.ipv4.icmp_echo_ignore_broadcasts = 1 Anyone knows what are the ...
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1answer
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arp add 255.255.255.255 ff:ff:ff:ff:ff:ff (router)

If I add arp entry in router config like this: arp add 255.255.255.255 ff:ff:ff:ff:ff:ff Open specific port: port: 1009 ip: 255.255.255.255 Will it broadcast message to all connected devices? I'...
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If a wireless router sends packets all by broadcast and with its full bandwidth, can each connected device receive the same full bandwidth?

If a wireless router sends packets all by broadcast and with its full bandwidth, can each connected device receive the same full bandwidth? The possible scenario is like this: 1) connect one device ...
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1answer
712 views

Hacked ubuntu pc? Broadcast messages

I have a fresh ubuntu 13 os installed on my system with almost default programs installed. But whenever I shutdown my pc i got these messages. Broadcast from root@.. (Unknown) at ... The system is ...
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1answer
304 views

Send broadcast message on user login

I'd want to add a new feature to my Red Hat 5 so when any user opens a ssh remote session a broadcast message gets delivered to a defined user/all users. How to do it?
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3answers
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Broadcast address in IPV4

I have a small network with the subnet mask 255.255.255.240 and the IP range is 192.168.2.1 - 192.168.2.12. From 192.168.2.1, I want to broadcast a packet. I don't want this packet to go anywhere ...