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.

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beacon interval, DTIM interval, & their effect on the network throughput/latency?

what effect does having beacon interval, DTIM interval set to a higher or lower value have on a wireless network latency? if I understand correctly if a network only has one AP, then setting the ...
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Multicast from LAN to WAN

I'm trying to transmit a multicast stream over the WAN. I know the NAT cannot allow this. For this purpose, I tried to use one Raspberry with two Ethernet interfaces: The internal one and another one ...
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How to use Linux ip utility to determine interface sending to IPv4 multicast group?

I have a Linux multicast application that will send to multicast group IPv4 address 232.1.1.1 and I want to know which local interface it will use by default. I believe the ip(1) utility should show ...
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Multicast detections problems

From a Windows 10 notebook, I would like to send the screen to a TV with Chromecast built-in. Except that the TV is not detected in device searches (screen or wireless docking station). On the network,...
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Encoding multiple live channels

I have a code working that encodes a UDP live channel into an HLS stream using m3u8 container. My question is, is there a way to simplify doing multiple channels, and ensure each is the same quality ...
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Multicast client keeps leaving group every 5 seconds

I have 2 HP DL360P Gen10 with a Windows 10 VM (IP 10.10.1.1) inside it. It is trying to join a multicast group (228.40.0.227). However, based on the wireshark capture (image below), this client is ...
Kim Tian's user avatar
13 votes
4 answers
4k views

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 ...
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Tunneling multicast over SSH

There's a remote server which has a LAN interface configured with IP address 192.168.100.2 as well it has a routing rule enabling all multicast 224.0.0.0/4 -> 192.168.100.2. The remote server is ...
Alejandro Lichtenfeld's user avatar
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Linux: virtual interfaces with multicast

I have a Linux process which communicates with external world using TCP and UDP. Also it does send message over multicast. Now I want to test the communication by mocking external communication. I ...
samy's user avatar
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Force a program to multicast on a specific network adapter

An openVPN layer 2 client has 2 network adapters: Physical network adapter (192.168.1.0/24) OpenVPN network adapter (10.0.0.0/24) Now the client wants to start (server) a LAN game. Server advertises ...
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Windows 10 host doesn't act on IGMP from NATed VMware Player Linux guest

My Windows 10 host ignores the IGMPv3 membership report sent to it from the CentOS7 guest via the NATed VMware network adapter. I would think that the Windows host would either act as a router and ...
Steve Emmerson's user avatar
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Do you have to join the broadcast group for IPv6 multicast?

When a client joins a network, is the client included in the ff02::1 IPv6 multicast group, which "broadcasts" to all nodes on the segment. OR, do I have to subscribe to the group using ...
Thomas Stokes's user avatar
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455 views

iperf multicast server cannot start - "bind failed: Cannot assign requested address"

I've seen this question asked on here but the user was using Windows XP and Windows 7, and none of the answers I saw worked for me. I'm trying to set up a multicast server on Windows 10, and I ...
maxpower8888's user avatar
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1k views

Multicast from WSL2 to Win does not work

I'm using ROS 2 (a robot middleware) both in WSL2 and in the host Windows OS on the same machine. For communication, ROS 2 uses UDP multicast (it also comes with a handy multicast troubleshooting tool)...
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Linux conntrack not seeing multicast responses as part of the same flow

My tv (192.168.1.48) is multicasting an SSDP packet (to 239.255.255.250:1900), and on my server (192.168.1.17), by running smcroute and doing some packet mangling to increase the IP TTL of this ...
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FFMPEG Specify Local Address for SDP

I have a network of AES67 devices that use multicast to communicate in a broadcast environment. I'm running FFMPEG on a machine with two NICs, one dedicated to the AES67 network and one facing the ...
RomanPort's user avatar
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1 answer
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Need clarification about ipv6 multicast and ipv4 broadcast

I’m studying IPv6 and I’m traying to better understand how it works in deep. So far, I know that there are essentially three types of addresses, based on the type of communication: unicast: one to ...
filograndipad2's user avatar
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FFmpeg doesn't write to HLS output (udp multicast input)

This is the output from ffprobe. Input #0, mpegts, from 'udp://239.0.0.80:2345?localaddr=192.168.2.127': Duration: N/A, start: 39580.799967, bitrate: N/A Program 60 Metadata: ...
Timotej Leginus's user avatar
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random packets routing due to multicast route

I have the current network configuration in my linux single board computer: ~# ifconfig eth0 Link encap:Ethernet HWaddr 00:05:B7:EE:88:0A inet addr:192.168.0.20 Bcast:192.168.0....
Abdelmonam Azaiez's user avatar
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IPv6 link-local multicast stops working after a reconnection

I have two microcontroller boards with the same Wifi module. One of the boards acts as an Access Point (AP) while the other acts as a Station (STA) trying to connect with the AP when it is in range. I ...
acevans's user avatar
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399 views

Linux multicast source address

I have a linux system (kernel 3.10.62 - yeah, I know it's old) with multiple interfaces: eth0 - 192.168.1.110/24 eth1 - 10.149.1.4/24 eth2 - 10.10.0.99/16 I'm trying to send to a multicast address (...
TazMainiac's user avatar
1 vote
0 answers
139 views

Difficulty joining an IPv4 Link Local multicast group

I am trying to get Python3 on Windows to join a IPv4 Link Local multicast group 239.255.0.3. When I configured my script to join group 224.3.29.71 I got a Windows firewall prompt and I successfully ...
Isaac Sutherland's user avatar
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255 views

Heavy Multicast Traffic

Having sniffed my SOHO network's I notice the heaviest burden from multicast addresses relating to UPNP services. There is 1 external drive on the network. Am I correct in thinking the networked drive ...
ChristAHFER's user avatar
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OSX doesn't list remote CUPS printer

I'm trying to add a remote printer in my OSX Catalina, but the problem is that remote printer is not in the list The remote printer is operating and properly configured, i used other OSX machine and ...
Beastmaster's user avatar
2 votes
1 answer
313 views

Multicast configuration for mDNS

I just bought a pair of Nexuslink 2000PT powerline adapters. These are identical to the Comtrend PG-9182PT. It turns out that my Chromecast's mDNS broadcasts are unable to make it through the ...
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Testing multicast - not getting proper results

This question was asked before here: https://networkengineering.stackexchange.com/questions/71813/testing-multicast-problem But I was pointed here. I use this tool: https://www....
Michał Lipok's user avatar
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522 views

IGMP Snooping Not Working as Expected

I am setting up set up several multicast audio streams on my LAN. I am using vlc on a Linux box to transmit the streams using a command line of the form: /usr/bin/vlc -I dummy --sout '#rtp{dst=224.0.0....
Fred's user avatar
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2 answers
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What is this UDP traffic to 230.0.0.1? And how can I block it?

My VM is of IP 192.168.3.20 in the network of 192.168.3.0/24. While running iptraf command on my machine, I am getting the response as shown in the attached image. I can't understand what kind of ...
Abhishek Poudel's user avatar
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1 answer
450 views

Source of multicast broadcast to WAN port

I have noticed multicast broadcasts from 192.168.30.2 hitting my router's WAN interface. That would be sourced from an interface that's somewhere locally on my router, right, or where would it be ...
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Connecting Nintendo Switches over Site-to-Site VPN

I have two sites connected with an OpenVPN tunnel on which I am trying to get two Nintendo Switch devices (one at each site) to see eachother so that they can game as if they're on the same LAN. All ...
Jason's user avatar
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Why I'm getting all of this multicast traffic, and how to restrict it on particular vlan

I have small network in my home, which contains 1x router, 2x switch, 1x ap, some computers and phones. Aa I also have two servers in cluster (Proxmox) and one QNAP NAS storage, which I use to store ...
Kristian Kirilov's user avatar
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1 answer
824 views

IGMP Proxying, no traffic coming in

After posting this question to Network Engineering, I was told the site is about enterprise environments, whereas my setup is a residential network. Hence, I'll try my luck here. I managed to ...
Atmocreations's user avatar
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219 views

IPv6 Global Multicast

Here is my interface configuration. inet6 addr: 2001:db8:0:f101::1/64 Scope:Global inet6 addr: fe80::20c:29ff:feaa:c19e/64 Scope:Link Link local works ok. ping6 -I eth0 ff02::1 But how ...
Mike Seeds's user avatar
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3k views

ffmpeg - copy http stream to multicast udp stream

i try to "copy" many tvheadend http streams to multicast udp streams the result should contain all streams: video, audio's and subtitels (especially epg) ...and at best without transcoding my ...
web27's user avatar
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Is it possible to find the Group IP of a local musticast network

I want to find the IP of the Multicast Groups I have joined. But, all the IP's obtained from netstat -ng are these: root@me:~# netstat -ng IPv6/IPv4 Group Memberships Interface RefCnt Group ----...
mranon's user avatar
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Multicast name resolution in the latest Win10

Version 1803 (OS Build 17134.590) I haven't found any working solution for the multicast name resolution issue in Win10. I cannot imagine, that everybody started to set-up an own Domain Name Server ...
StrictLine's user avatar
3 votes
1 answer
23k views

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 ...
Georgi Stoyanov's user avatar
3 votes
0 answers
4k views

List which applications are subscribing to a multicast group in Windows

I've been looking for way to list what processes/applications on my host are subscribing to what multicast addresses. Through the command line, I can issue netsh interface ip show joins which lists ...
chrillof's user avatar
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1 answer
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Multiple applications using same multicast group on the same Windows host

I am a software engineer designing a distributed software, in which the startup procedure utilizes IP multicasting to discover its peers. The software itself is distributed as different executable ...
chrillof's user avatar
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0 answers
797 views

iptables Multicast Traffic Dropped on WAN

For my home router, I am running a small Debian box which connects to my ISP via a separate modem using PPPoE. I have had some iptables rules in place for quite a while which: Allow all traffic on ...
jren207's user avatar
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2 votes
1 answer
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How to get a stream with ffmpeg through a specific eth(interface)

I have a server with 2 interfaces, eth0 and eth1. eth0 -> conected to Managment Switch eth1 -> conectated to Video Switch I would like to get a multicast with ffmpeg through eth1. Is there some ...
RRicardo's user avatar
-1 votes
1 answer
255 views

Can anyone tell me the reason as to why Windows applications have to send data through Multicast 224.0.0.1 and etc?

So I have DNS Client, IGMP, and UPnP all disabled in Windows 8 yet Windows applications such as Chrome, GoogleUpdate, and Windows Activation executable still tries so hard to send outbound UDP frames ...
Resonce's user avatar
5 votes
1 answer
2k views

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, ...
strubbly's user avatar
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3 votes
1 answer
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Windows route selection and "route print -6" vs "netsh interface ipv6 show route"

So I'm using Windows 10 and I need to redirect some IPv6 multicast traffic to a specific interface (a USB-Ethernet adapter to be more specific). By default all multicast traffic is going to my WiFi ...
schaazzz's user avatar
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1 answer
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IP TV (Multicast) not working on one PC

I can receive IP TV via Multicast using my ZyXEL ARMOR Z1 router. It works for my Surface Laptop and my mobile Device (LG G4) via WLAN without problems. With my Desktop PC it doesn't, neither using ...
Dollique's user avatar
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2 votes
0 answers
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ffmpeg restreaming with an intermittent input

I have a live unicast stream that I restream as multicast. This works fine: ffmpeg -i <uri> -c:v copy -an -f rtp rtp://<multicast_ip>:<port> However, on occasion the input stream ...
user1447903's user avatar
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1 answer
285 views

Does facebook multicast or unicast a live video? [closed]

I was wondering if Facebook uni-cast or multicast an ongoing live video streaming to a group of users. For example, if a user joins a live stream, will he/she get a separate uni-cast or multi-cast ...
Ammar Bukhari's user avatar
1 vote
1 answer
327 views

Routers block multicast request once node joins the same group

In the software I used, same "node" needs to join an IPv4 multicast group (to respond to the network protocol requests) but also needs to send requests to the same IPv4 multicast group (in order to ...
Max's user avatar
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if wireshark shows a layer 2 multicast packet on a WLAN should all connected clients receive it?

I have an Android device connected to a WLAN via a Cisco WAP121 access point. The android device runs an app that sends out an MDNS query for services. This all works fine for a while and then I stop ...
Barbara's user avatar
1 vote
0 answers
205 views

Netgear X6S R7900P - Multicast

have a Netgear X6S R7900P set up as a Wireless AP which is connected to a Apple Airport Extreme. I ran into an issue where a multicast sent from one of the computers connected to the Apple Airport ...
Garfield81's user avatar