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

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I'm trying to test following envirorment: One server (it's a router, It has busybox and few other cmd) with a a physical serial port and and open socket #tcpsvd -v 0.0.0.0 -p 999 cat /dev/ttyS0 ...
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I have a server on VPN configured as a TAP device (as opposed to TUN, since it is joining to a wider network). I can send unicast traffic of that network, as well as receive multicast packets (and ...
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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 ...
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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 ...
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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 ...
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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() ...
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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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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 ...
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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 ...
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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 ...
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[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 ...
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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 ...
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We have a requirement for UDP multicasting in our project using Linux 4.1 kernel with static ip address. Basic UDP multicasting by the use of the sendto function to send data works fine with device ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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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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 ...
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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 ...
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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 ...
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I want to create a multicast group with 3 computers then ping them all, how is it done in the Linux CLI?
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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 ...
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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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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 ...
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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 ...
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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
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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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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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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, ...
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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 ...
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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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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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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 ...
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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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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 ...
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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
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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
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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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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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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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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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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
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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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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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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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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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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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