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.

Filter by
Sorted by
Tagged with
0 votes
0 answers
29 views

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: ...
user avatar
0 votes
0 answers
29 views

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....
user avatar
0 votes
1 answer
14 views

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 ...
user avatar
1 vote
0 answers
64 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 (...
user avatar
1 vote
0 answers
36 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 ...
user avatar
0 votes
1 answer
122 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 ...
user avatar
0 votes
1 answer
64 views

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 ...
user avatar
2 votes
1 answer
118 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 ...
user avatar
2 votes
1 answer
249 views

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....
user avatar
0 votes
0 answers
214 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....
user avatar
  • 11
1 vote
1 answer
967 views

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 ...
user avatar
0 votes
1 answer
228 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 ...
user avatar
0 votes
1 answer
785 views

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 ...
user avatar
  • 1
0 votes
0 answers
123 views

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 ...
user avatar
0 votes
1 answer
525 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 ...
user avatar
0 votes
1 answer
72 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 ...
user avatar
1 vote
0 answers
2k 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 ...
user avatar
  • 11
0 votes
1 answer
335 views

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 ----...
user avatar
  • 3
0 votes
0 answers
62 views

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 ...
user avatar
2 votes
1 answer
12k 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 ...
user avatar
3 votes
0 answers
2k 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 ...
user avatar
0 votes
1 answer
839 views

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 ...
user avatar
0 votes
0 answers
565 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 ...
user avatar
  • 21
1 vote
1 answer
7k views

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 ...
user avatar
-1 votes
1 answer
95 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 ...
user avatar
5 votes
1 answer
1k 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, ...
user avatar
  • 121
1 vote
1 answer
2k views

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 ...
user avatar
  • 113
0 votes
1 answer
1k views

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 ...
user avatar
  • 111
1 vote
0 answers
301 views

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 ...
user avatar
0 votes
1 answer
230 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 ...
user avatar
1 vote
1 answer
286 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 ...
user avatar
  • 111
0 votes
0 answers
1k views

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 ...
user avatar
1 vote
0 answers
192 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 ...
user avatar
0 votes
0 answers
154 views

Why is my Mac persistently scanning multicast address?

I have a Linux machine with Psad installed. When I observe the log reports generated (admittedly I have Psad configured to be particularly sensitive), it lists a large number of scans originating ...
user avatar
0 votes
1 answer
234 views

Beacon interval low power mode

I am creating a UDP multicast net using Ubiquiti Rocket M2. None of the hardware receivers (ESP 8266) are on lower power mode. The only (possibly) low power device that is connected to the AP is my ...
user avatar
7 votes
1 answer
2k views

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 ...
user avatar
  • 71
0 votes
0 answers
1k views

Set up multicast in MikroTik router and in PC

My internet provider broadcasts several TV channels over multicast on port 5004. They provided me with these instructions for enabling receiving of their multicast broadcast: In your case it is ...
user avatar
  • 12k
0 votes
2 answers
561 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....
user avatar
1 vote
0 answers
852 views

Avahi seems to stop publishing/refreshing services after a while

Firstable, I looked up to several Q/A, i can ensure that the following points are fullfiled: IGMP snooping isn't filtered by switch/router. Bonjour services (mDNSResponder.exe) is granted and allowed ...
user avatar
  • 11
0 votes
1 answer
848 views

Multicast in LAN not received by all hosts

I'm writing an application to get multicast updates from a current-measuring device which is plugged into my LAN. The device sends out packets to multicast group 224.192.32.19:22600 every few minutes, ...
user avatar
-2 votes
1 answer
549 views

Multicast in the MSC rate for 802.11n and 802.11ac

Is there any ath10k expert around here? Not sure if I could ask this question here. Otherwise, please direct me to the correct forum. I would like to know if there is any possible to operate ...
user avatar
  • 113
1 vote
1 answer
982 views

Can Multicast cause network loops?

I've been dealing with a persistent network loop for the past month, trying different things. Now I see in one of my network interfaces that it recorded 1.6 million multicasts, and roughly half a ...
user avatar
1 vote
2 answers
82 views

Linux: is it possible to create instruction to check if connection between 2 hosts is possible?

I am running some software which is deployed on two different hosts.Hosts communicate via network. Linux is used on both. They use special port for communication. Also Multicast can be used. A ...
user avatar
2 votes
0 answers
718 views

VLC - Video Streaming Synchronization

Using VLC 2.2.4 Weatherwax. I'm streaming a video using UDP as multicast. Stream is displayed by 2 different clients using VLC. I'm trying to synchronize the display on these 2 clients. I've seen ...
user avatar
0 votes
1 answer
846 views

How to improve multicast in AP

I have more than 10 clients are connecting to that AP, pinging 30000 size packet. After 1 -2 hours, start to see 1-2 devices encountered tx-ccq low% (eg. 1 - 5%). Is this issue related with ...
user avatar
  • 113
0 votes
0 answers
715 views

Discover multicast addresses in a network

Consider there is a network where users can access multicast streams by knowing the IP and port of the multicast streams. The traffic is not sent to them by default till they request the stream and if ...
user avatar
  • 175
1 vote
0 answers
60 views

Sending ihex file over UDP using sockets

I am working with IPv6 and UDP sockets using python-2.7. I am particularly focusing on IPv6 Multicasting ff02::1 where every Link-Local address device (with fe80::) responds to queries from a central ...
user avatar
0 votes
1 answer
376 views

Multicast with same IP generated by different servers

I have a simple config where 2 Windows servers are generating each multicasts on the same addresses. For example, on a direct Ethernet wired link between the servers they both generate the multicast ...
user avatar
  • 103
3 votes
1 answer
36k views

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 ...
user avatar
  • 1,687
0 votes
1 answer
4k views

Streaming multicast on VLC over IPv6

We are trying to send a multicast video stream using VLC 2.2.1 on IPv6 protocol between two computer - server and receiver. Both computers are connected via Ethernet cable from one network card to ...
user avatar