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Questions tagged [multicast]

To be used with questions about network multi-casting in general.

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how to ping (multicast) between two Gnu/Linux PCs

Firstly, I don't have much idea about multicast in Gnu/Linux. Is there anyway to assign fixed multicast IP address on both PCs (E.g. fixing unicast IP address in PC), and how to enable multicast in ...
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2answers
43 views

install smcroute in Linux

How do I install smcroute in Ubuntu 16.04? If I try to install using apt-get, I am not finding the commands "smcrouted" and "smcroutectl" in bash. Also, the GitHub page asks to configure the kernel to ...
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56 views

Linux Bridge br0 - Routing multicast data

I have a bridge interface br0 that uses to two physical interfaces: eth0 and eth1. These are connected to a switch that receives multicast data on 4 different multicast address (234.1.2.0/1/2/3) from ...
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62 views

Multicast ICMPv6 comes back with conntrack state invalid

I was playing arround with the Multicast feature of IPv6. $ ping ff02::2%wlp3s0 This should normally result in an echo-reply from all the routers on your local network segment (Wikipedia - IPv6). So ...
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17 views

Strange behaviour sending IGMP on multi IP address for interface

I'd be glad to have some info/clue on the behavior in the followings situation: There are eth0 with IP address 10.10.10.10 and eth0:1 with IP address 20.20.20.20. IGMP join and leave shall be send ...
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236 views

How to setup default source interface for multicast?

There is a server 172.16.0.50 with udpxy. It converts multicast video to http unicast streaming to "R2" router clients. There is igmp-proxy setup on "R1". My aim is remove igmp-proxy and link between ...
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1answer
162 views

Why would properly VLAN tagged multicast traffic not arrive on the tagged interface?

I'm working with an application that sends multicast traffic between a client and server. This traffic is sent via multicast. The client and server are both using VLAN interfaces, and need to ...
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209 views

PulseAudio RTP Multicast - how to synchronize audio on all receivers?

I am streaming music from a single controlling PC ("sender") to multiple PCs (receivers) on my LAN as described here: https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/Network/#...
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2answers
671 views

PulseAudio RTP Multicast - how to play sound on sender too?

I am streaming music from a single controlling PC ("sender") to multiple PCs (receivers) on my LAN as described here: https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/Network/#...
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1answer
419 views

multicast traffic is able to poke a hole into the netfilter connection tracking system

I have an IPTV solution at home where the ISP sends me hundreds of large UDP datagrams per second from 10.4.4.5 port 10 to 239.3.5.3 port 10, i.e. it is using multicast. My current iptables ...
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1answer
197 views

Linux VRF and Multicast IP

I am attempting to use VRFs in Xubuntu 18.04, but I'm not having much luck when it comes to multicast IP addresses. I have been using https://www.kernel.org/doc/Documentation/networking/vrf.txt as a ...
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476 views

How to setup multicast for this network?

I have a Network like this at my home. # ip route show default via 192.168.0.1 dev enp1s0 192.168.0.0/24 dev enp1s0 proto kernel scope link src 192.168.0.110 192.168.1.0/24 dev enp3s0 proto ...
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1answer
194 views

Packet delimiter in netcat source file

Is there a delimiter or some way of telling netcat how many bytes to send per packet from a file? Invoking netcat multiple times in a script is not acceptable as I need to send them out as fast as ...
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1answer
381 views

Accessing qemu multicast networks (from Docker containers)

QEMU allows to connect different VMs by using a virtual network based on a common multicast address by specifying -netdev socket,mcast=230.0.0.1:1234 on startup. This way I can easily connect ...
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308 views

multicast_to_unicast with hostapd on RPi

I'm trying to use hostapd's multicast_to_unicast feature. The AP is working fine, but I get this error: nl80211: multicast to unicast not supported on interface wlan0 I'm on Raspbian with next ...
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26 views

Identify application that created a certain IGMP join request?

Is there a way to find from which application a certain "Group Record" came from in an IGMPv3 packet? We are trying to figure the application that added the IGMP request to include source as local ...
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103 views

Example setup for zita-njbridge in multicast mode?

Do you have a working zita-njbridge triplet of command lines (one n2j, two j2n) proven to run in multicast mode, which you might share? I'd like to study a working example, to compare to my special ...
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2answers
479 views

muticast issue between two ubuntu machines

I have two ubuntu 16.04 machines (machine A and B) wich are connected by network cable. Machine A is creating multicasts. The multicasts do not reach machine B. Does anyone know, what the reason for ...
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0answers
189 views

Reading MLDv2 queries using an IPv6 socket

I have mrd6 installed on my raspberry pi. It registers with a local interface (tun0) and periodically transmits MLDv2 queries over it. According to [RFC3810], MLDv2 message types are a subset of ...
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2answers
781 views

Connecting two clients on different physical interfaces using smcroute

I am very new to networking. I have two clients connected on two different physical interfaces which has upnp running on them. I want to add both of them to the same multicast group, so that they both ...
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1answer
336 views

Responses from multicast 255.255.255.255

On one particular box, i cannot get responses to broadcasted messages to (255.255.255.255). For example Sending DHCPDISCOVER DHCPREQUEST on wlan0 to 255.255.255.255 And see even responses from ...
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1answer
1k views

Is Pulseaudio able to receive RTP Multicast from any source?

Been attempting to get Pulseaudio to receive an RTP stream from VLC. I can get it to receive a TCP audio stream no problem - the pi running Pulse is receiving the multicast data as expected, but when ...
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2answers
5k views

How do I forward multicast traffic between 2 differant lans using iptables?

Goal: Need lmc or "LAN Messenger" to work on 2 lans separated by a Linux gateway using iptables. Information: Must be this program "LAN Messenger". Lmc uses multicast address 239.255.100.100:50000 ...
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1answer
366 views

do mDNS and LLMNR queries use the same format as tcp DNS?

mDNS clients send queries to 224.0.0.251:5353 LLMNR clients send queries to 224.0.0.252:5355 Is their packets format the same as good old fashioned tcp dns ? Let suppose I want to resolve the ...
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0answers
172 views

using IPv6 Multicast to push a file

I would like to push a file over the network once to reach multiple linux hosts over IPv6 using multicast. (I think, that's the best way) How can I get my file pushed over IPv6 to multiple systems? I ...
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0answers
320 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 ...
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1answer
1k views

Cannot disable multicast in linux

Environment: Two servers connected through a router, both running Ubuntu 16.04 I use the following commands to disable multicast: ifconfig eno1 -multicast or ip link set eno1 multicast off And ...
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2answers
421 views

Continuous multicast traffic from my router

I'm using an iptables firewall on my local Linux server. The log tells me that there is a continuous multicast on the network by my router (Fritz box). Is this a normal behaviour. Should I allow this ...
2
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1answer
166 views

FreeBSD Multicast Ethernet Address

I'm trying to recreate a setup used in a paper (this one to be precise). It has two servers behind a switch, which also has a client attached. I am using three FreeBSD VMs - one for the switch and ...
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1answer
6k views

App cannot receive multicast packets on CentOS 7

I have a CentOS 7.2 machine that is a VMware guest. I am subscribing to a multicast group and seeing all the multicast I'd expect, but my app is not seeing the contents of the stream. strace shows ...
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0answers
105 views

Multicasting with a Debian Router

I have a local network and I want to use NTP in multicast mode on this LAN. The first step to do this is to get multicast networking to work first. In the network I have 5 Debian machines all ...
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1answer
3k views

How to block broadcast messages (Apple's mDNS traffic)

I am in a network and a user is sending broadcast messages on udp port 5353. Regardless of what that is and what their purpose is, I decided to block all the traffic, so I ran: sudo iptables -A INPUT ...
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0answers
728 views

Is there a way to set the default TTL for multicast packets?

This Question Provided some valuable insight on how to set the default TTL for IP packets on a system. I would like to do the same thing, but for multicast packets. I do not know if this is possible....
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0answers
497 views

Implications of increasing igmp_max_memberships

I am writing an application that will subscribe to 150+ multicast groups. It appears the linux default number of multicast subscriptions is 20 which can be increased via sysctl -w net.ipv4....
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1answer
2k views

Linux ignoring multicast route over loopback

I'm trying to test some multicast code on a single machine. I'm trying to get the packets sent over the loopback device (lo) instead of the default eth1. Googling keeps turning up the incantation ...
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1answer
2k views

Multicast NTP server/client

what I have here is an NTP server (on Linux Mint) and a client (likewise). Server is configured to send a multicast message across the LAN which clients receive and update their clocks - it was ...
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3answers
3k views

firewalld accept response to multicast DNS query from ephemeral port

I'm trying to configure firewalld (Fedora 21) so that responses get through for MDNS queries sent from a client application using an ephemeral UDP source port to a multicast target. The responses are ...
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420 views

VLC multicast input stream does not play video but plays audio

I m trying to play input multicast streaming on my fedora 21 OS PC with VLC player. By using below command vlc -vvv rtp://@239.192.xx.xx:52xxx from terminal, it launches VLC player and plays audio ...
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1answer
800 views

What is an IGMP querier?

I am looking at which multicast groups the linux kernel is subscribed at the moment. What do the values in the Querier column mean?
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1answer
595 views

How do UDP multicast behave on Unix?

A Unix expert told me that ip-multicast uses Ethernet multicast (depends on MAC address to spread) instead of IPv4 multicast. Is this true? Does it depend on the kernel or version?
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1answer
92 views

Multicast communication blocked?

I am struggling to create a multicast communication with basic client and server. So I looked on the web to find any working example... and they don't work. I mean the server is waiting for a ...
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0answers
375 views

How do you tweak iptables limit rules on openSUSE Tumbleweed?

I have a fresh install of openSUSE Tumbleweed, it is logging a lot firewall related stuff due to my apple devices multicasting to enable airplay. Lines look like: Mar 14 12:45:13 server kernel: SFW2-...
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1answer
2k views

Allow multicast packages from the bridge to wire in KVM [closed]

On a CentOS 6.5 host, I have a couple of guests - Ubuntu 12.04 and CentOS 6.5. The Ubuntu guest is generating mcast traffic that is visible via a tcpdump on the br3 interface. It is also visible on ...
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136 views

How do I mcast multiple pcap files simultaneously with guaranteed ordering and controllable speed?

We capture many pcap files every day on many different multicast groups. For the purposes of testing & benchmarking, we wish to replay these files in an isolated environment and in a controlled ...
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1answer
15k views

Creating multicast join for tcpdump captures

I want to write a linux shell script which will capture specific multicast traffic. Specific as in, I want to create a pcap file that has all the traffic for one specific multicast group/port. Here ...
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3answers
6k views

br0 causes to drop multicast connection after 5 minutes

I have these interfaces set up on the router (Linux machine): br0: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST> mtu 1500 inet 192.168.0.3 netmask 255.255.255.0 broadcast 192....
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4answers
38k views

Multicast UDP not working

Multicast UDP on raspberry pi I haven't narrowed things down enough to know if my issue is because of debian, raspbian specifically, or if I am just missing a something completely. I have a python ...
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1answer
12k views

Dumping multicast UDP stream with socat

I am setting up video streaming. In local network, there are two devices streaming video over UDP multicast. One is regular computer with Linux (streaming to 239.220.221.10, port 9200), second one is ...
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1answer
3k views

cat file to udp, pt 2: send 1 udp packet per ^C-delimited line

Yesterday I asked a question about catting a file over a UDP socket in bash. The solution we came up was netcat -c -w 1 -v -u -s 127.0.0.1 239.255.0.1 30001 < test.txt. This worked in the sense ...
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1answer
9k views

cat file to multicast

I have a text file (test.txt) which represents captured network data. The actual protocol is text-based, with NULL line endings, so this isn't a problem. I need to run this test captured data ...