Questions tagged [multicast]

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

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Application does not get mulicast messages on ubuntu os

I have an applicaion running on ubuntu 16.04 os. The application is receive mulicast messages however the application does not get the messages. I can see on wireshark IGMP message that the ...
Ala's user avatar
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configure raspberry pi as multicast server and host

I have a network setup that I want to use to research igmp. I have two routers and a switch, three raspberry pis are connected to the switch with different ip address subnets. I have already ...
uche9260's user avatar
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nftables - multicast packets not matched

I've set up a rule to match multicast packets as follows: add rule filter_4 new_out_4 meta pkttype multicast goto multicast_out_4 filter_4 is IPv4 table, new_out4 is output chain and multicast_out_4 ...
metablaster's user avatar
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Is there a way to set the default TTL for multicast packets at system level?

pcap capture from my Centos 7 to multicast address shows TTL 25. Firewall considered it as DDOS and dropped packets. I know that application code can set the multicast TTL with a call to setsockopt() ...
user3183426's user avatar
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Is there a tool to generate layer 2 multicast traffic for test

Is there a tool to generate layer 2 multicast traffic on Linux (debian/raspberry/ubuntu). Need it for testing purpose. Need to monitor some netfilter rules. Expecting no one on the other side to ...
Haswell's user avatar
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How to enable a host to reply to multicast ping

I'm experimenting with multicast traffic within my wireless network and tried to ping some pre-defined multicast address: $ ping 224.0.0.251 The ip address of the ping machine is 192.168.0.11. So I ...
Some Name's user avatar
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2 answers
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What multicast protocol NIC uses?

I have CONFIG_IP_MULTICAST=y and currently learning about IP multicast and found out that there're 2 common multicast protocols for IP networks: PIM SS and PIM DS. Querying my wifi adapter info I ...
Some Name's user avatar
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igmpproxy not routing SSDP between interfaces

I have hostapd running on two wireless devices in isolated and bridged mode: wlp1s0 is behind the bridge wan, and wlp5s0 is behind the bridge iot. The exact configuration for each bridge is the one ...
Quentin's user avatar
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disable multicast and promiscuity is off, nic still receive multicast packet

[root@VM-0-13-centos ~]# ip link set dev eth0 multicast off [root@VM-0-13-centos ~]# [root@VM-0-13-centos ~]# ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group ...
Ccfeiker's user avatar
2 votes
1 answer
532 views

ipv6 multicast fails when it should loop back to self

So far I use multicast with ipv4 and it works; all involved computers run linux. I listen on two machines and send on one of those two (in a separate terminal). In the below example 'Hello 1' is ...
Al_'s user avatar
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Forward multicast traffic to bridge interface

I am trying to forward the multicast traffic arriving on interface eth1 to a bridge I created with ip link add br0 type bridge. Elsewhere I have done this with a simple ip route add 226.3.2.1 dev ...
joel_muehlena's user avatar
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2k views

multicast to all interfaces (how to set up the routes?)

I want a host to send out multicast traffic to all interfaces, but it seems I can only have one route. I tried ip route add 224/4 dev eth0, and then ip route add 224/4 dev sit1, but the second one was ...
U. Windl's user avatar
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Configure SuSEfirewall2 in SLES12 SP5 to allow multicast via `sit`

I'm experimenting with multicasts in our Intranet, but it seems the Intranet does not support multicast routing. Anyway, I set up an IP-IP tunnel (sit1) between two machines in different subnets, and ...
U. Windl's user avatar
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673 views

Using UDP multicast in Linux, recvfrom() cannot get data

I have a task to get data from a sensor device. Through the Wireshark, I can capture information as below: wich send information from 10.13.1.113 to 224.0.2.2 (Multicast Address). Src Port 42402, Dst ...
LincolnYang's user avatar
3 votes
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1k views

what does `IgnoredMulti` statistic for Udp in debian linux mean?

I have a Ubuntu machine that is receiving UDP packets by joining a multicast group, occasionally we are getting UDP packet drops. when I am trying to monitor using netstat -s I get the following ...
Anirban Bhowmik's user avatar
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1 answer
1k views

Centos8 does not respond to IGMP v2 membership queries

In troubleshooting a general issue why a Centos 8 box doesn't receive multicast data after sending a JOIN, analyzing with wireshark also shows the Centos box not responding to IGMP v2 membership ...
Danny's user avatar
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IGMP v3 JOIN sent but no traffic from switch

I'm trying to join an IGMP multicast stream from a Centos 8 machine but after sending a JOIN, there is no traffic coming from the switch. Simple connection: MUX <-----------> cisco3850 <------...
Danny's user avatar
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4 votes
2 answers
2k views

How to set preferred IPv6 interface

I have a program that sends multicast traffic via IPv6. It sends traffic out of the default network interface. It works fine normally (traffic goes out eth0) however if I have Docker loaded, then it ...
Malvineous's user avatar
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How to check if someone is streaming RTP over a specific Multicast address?

Let's say we have ubuntu machine A with ip 192.168.0.20 and ubuntu machine B with ip 192.168.0.21 in same network. How can I check if machine A is streaming RTP to a multicast address and port for ...
oguz karahan's user avatar
2 votes
1 answer
1k views

netcat producing EINVAL when sending to UDP IPv6 multicast

I'm using netcat on Fedora to test an IPv6 UDP multi-cast address. The command is echo hi | nc -6 -u ff02::777:777:777 7777 netcat responds, "Invalid argument." Running strace yields ...
Daniel Walker's user avatar
1 vote
1 answer
3k views

How can i create a multicast group and send a message to it?

I want to create a multicast group with 3 computers then ping them all, how is it done in the Linux CLI?
ben shalev's user avatar
1 vote
1 answer
548 views

systemd-networkd multicast route removed when no carrier

We have a gateway product running Ubuntu 20.04 LTS. It has two network interfaces (WAN/LAN) configured using systemd-networkd. We use multicast messages to communicate to thousands of IoT devices ...
andy.jackson's user avatar
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Converting an add-rule to a service for firewalld

I am having a hard time creating the following lines for multicasting into a service in firewalld. firewall-cmd --permanent --add-port=49152-65532/udp firewall-cmd --permanent --direct --add-rule ipv4 ...
spry's user avatar
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2 votes
1 answer
765 views

incoming UDP multicast stream stops after fixed time on macOS

My ISP provides IPTV feature, stream example: udp://@239.255.2.97:5500. I'd like to watch IPTV on macOS, so I used VLC. Initially, IPTV didn't work at all. At first I thought that it's locked to ISP's ...
kambala's user avatar
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How to copy large files via network to multiple Linux PC at once?

I have 15 Linux PC and I need to install two virtual machine(Windows 10 and Ubuntu) in every one of these PCs. I decided to install these two machine in one PC and copy virtual machine files to ...
Amir Sabeghi's user avatar
1 vote
0 answers
329 views

Linux: UDP "multiplexer" inside kernel

I have an application with very high performance requirements and the following job: There is incoming UDP traffic on port 1234. The packets have as fast as possible to be sent to hosts H1, H2, ... Hn ...
Kevin Meier's user avatar
1 vote
1 answer
433 views

Multicast route not linking to userspace

Ok So I have a user space application that needs to get data from multicast traffic, however I cannot seem to get the traffic out of kernel space and into userspace where the application can utilize ...
MacLCM's user avatar
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9 votes
5 answers
6k views

How to install Linux on multiple PCs at once?

I need to install Linux OS on 30 PCs. Is there any way to install from one ISO image with multicast or something like WDS in Microsoft? I have a Ethernet connection with speed of 100Mb so installing ...
Amir Sabeghi's user avatar
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1 answer
5k views

how to test multicast with socat on one machine

I'm a linux beginner and trying to test multicast with socat on Ubuntu which works. A bit "too well" actually (or I'm misunderstanding something fundamental) my network looks that (ifconfig, ...
Arikael's user avatar
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1 vote
3 answers
746 views

How does multicast routing work on the internet?

For a LAN, it is effectively several additional layers of filters on hardware/software, maybe including switch(IGMP snooping)/NIC/kernel stack, etc. Otherwise it is similar to broadcast. I think I can ...
QnA's user avatar
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1 answer
2k views

Can UDP multicast listening socket receive unicast packet, OR, can UDP unicast socket receive multicast packet, on Linux IPv4 stack?

My understanding is this, if a socket does not bind local address(or binds to INADDR_ANY), and does not call connect() to set remote address/port, then there is no way to prevent unicast packets to be ...
QnA's user avatar
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1 vote
0 answers
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Tunnelling IP Multicast traffic between two residential networks or machines

The Ableton Link music synchronization service operates by broadcasting and receiving messages via an IPv4 multicast group in the "Ad-Hoc 2" address block. In order to use the protocol to synchronize ...
s-ol's user avatar
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3 votes
0 answers
937 views

Debian ignores second multicast packet

I have a home local network with several devices. One of the devices is sending multicast packets with information about some events (smart home). It works well - I've tried to launch Multicast Tester ...
BArtWell's user avatar
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1k views

Setting up multicast between two apps on same computer

I have two Java apps running on the same computer. Each one uses the IP address of the computer (the IP on the enpXXX interface). App1 sends a packet to App2 using multicast, but it doesn't seem to ...
JustBlossom's user avatar
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1 answer
930 views

Multicast packets being dropped at IP layer?

External multicast data is being received by machine #1 and forwarded to machine #2. On machine #2 I can see the multicast packets being received when I use tcpdump, ethtool and netstat -i (ethernet ...
user997112's user avatar
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1 answer
1k views

network behaviour with tcpdump

We are developing communication interface converter which is running Linux. The unit may receive unicast or multicast IP and converts it to some other physical layer. On the other hand, the unit ...
user1977050's user avatar
4 votes
2 answers
6k views

Multicast routing using netplan

Trying to setup multicast route to interface in Ubuntu 18.04.2 Netplan's syntax does not allow something like: routes: - to: 224.0.0.0/4 dev: eno1 this config does not work: addresses: - 192....
user363600's user avatar
1 vote
1 answer
556 views

IGMPv3 Source Filtering Configuration

I know that multicast addresses are being kept in /proc/net/igmp. Where is the configuration for v3 source filter being kept? Please note that I do not wish to inspect actual IGMP packets, I wish to ...
corsel's user avatar
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1 vote
2 answers
2k 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 ...
Tamil Selvan's user avatar
7 votes
0 answers
787 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 ...
Hermilton's user avatar
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1 vote
0 answers
183 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 ...
user1977050's user avatar
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2k 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 ...
Kirillius Labutin's user avatar
1 vote
1 answer
2k 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 ...
Centimane's user avatar
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2 votes
0 answers
1k 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/#...
MountainX's user avatar
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2 votes
1 answer
3k 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 ...
Martin's user avatar
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1 vote
1 answer
927 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 ...
JMercer's user avatar
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0 votes
1 answer
4k 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 ...
Gihan Lasita's user avatar
1 vote
1 answer
1k 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 ...
CarlH's user avatar
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1 vote
1 answer
3k 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 ...
michas's user avatar
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1 vote
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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 ...
Alex's user avatar
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