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Questions tagged [multicast]

Multicast is the mechanism using which data traffic is reduced thoughout the network if a certain number of receivers are interested in the same data from the same source. This increases the efficiency of the network as less packets needs to be processed by the intermediate routers in the network. An inverted(spanning)tree like traffic path is formed for multicast data. This ensures that packets are replicated only when necessary.

122 questions
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Linux built-in or open source program to join multicast group?

I'm using tcpdump to capture multicast packets and had to code up a custom program to join multicast feeds so tcpdump will "see" the packets. Just wondering if netcat or any other applications can perform this function instead?
chriskirk
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IPv6 multicast address for all nodes on network

I've got a basic network with 3 nodes (VM's). One node publishes an event, the other nodes listen for it and print something when received. It used to work one-on-one (so node gives event to each other node seperately), but I'd like to implement…
Sven
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Can YouTube (e.g.) send a video file once and multiple users stream it?

Can YouTube (e.g.) send a video file once and multiple users stream it? Or does YouTube need to send the file to each person individually, even though all of the users live in the same region? If it is the second case, is there any way through,…
Someone
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Getting Chromecast to work across subnets

I know Google says its not supported. Has anyone got a Chromecast to talk to a client on a different subnet? I have an OpenWRT router connected to my internet providers router (parent router). The OpenWRT network is a different subnet and handles…
Adam Mills
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Why does router send packets to the multicast address?

I have a computer running linux and it has ufw activated with a couple of simple rules set. It is connected to ASUS 4G-N12 router by wifi. When I looked in ufw logs a few days ago it turned out that it had blocked some connections. Today I check…
Tomasz
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WiFi UDP unicast vs. multicast speed

From what I have gathered UDP multicast / broadcast over WiFi will not yield the speed as one would have thought. What about UDP unicast over WiFi? Can anyone confirm that the latter will have a normal speed?
EmilyJ
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How do I disable multicast on the TCP/IP stack for Windows?

I'd like to disable the TCP/IP stack's support for multicast completely on Windows for diagnostic purposes. How do I do this? I'm looking to do this on Windows XP, but if none can be provided, instructions for other versions are acceptable, too…
user314104
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How do I check if my router blocks multicast traffic?

I am trying a sender and receiver multicast c# program on my computer. How do I check if my router blocks multicasting? i.e whether members of the group receive packets from 224.0.0.1.
epsilon8
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Filtering TCPDUMP over packet length

I am looking to narrow down my tcpdump by packet length. I know I can `| grep but I was wondering if I can pass this particular packet length as an option in 'tcpdump'. I am trying to write a script to show me all present MPEG-TS multicast on the…
Georgi Stoyanov
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1 answer

IGMP and Wake On Lan

I have a Windows 10 server which has been operating well for some time using Wake On Lan. The Realtek adapter is set with Wake On Magic Packet enabled and Wake On Pattern Match disabled. Similarly, Windows is set to "Wake only on Magic Packet". …
strubbly
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How do I enable/set multicast rules using firewalld in RHEL7 / CentOS 7

I cannot find docs on how to enable multicast for firewalld which is the default firewall in RHEL / CentOS 7. Can some enlighten me? FYI: I know how to do it using iptables.
Neon
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DD-WRT and Chromecast: default WLAN to LAN bridge blocks UDP?

I have DD-WRT running in gateway mode on a DIR-615 I1. I've updated to the newest available build. Chromecast is a wireless-only device, for those unfamiliar. The device has been set up and operates normally using wireless devices associated with…
victoid
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How to connect two bluetooth speakers simultaneously via "Virtual Audio Cable"?

I have two speakers that I need to connect wirelessly via bluetooth. These are standard aux/usb speakers, and presently I've connected one of the speakers via 3.5mm jack to my windows 10 laptop. I have a bluetooth USB Dongle, that allows an aux…
mk117
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iperf returning “bind failed: cannot assign requested address” in Windows XP and 7

I am trying to set up iperf on an old HP server running Windows XP Professional to test multicast, but whenever I issue the command iperf -s -u -B , it returns: bind failed: Cannot assign requested address It doesn't matter what I put…
Liesmith
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VLC internet multicast

I want to stream video using VLC so everyone can connect to my pc and watch it. Is there any way to do it? As I understand I can multicast video only in my network (but I need it to be available from the internet). I tried to stream video specifying…
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