Questions tagged [multicast]

In computer networking, multicast is the delivery of a message or information to a group of destination computers simultaneously in a single transmission from the source. Copies are automatically created in other network elements, such as routers, but only when the topology of the network requires it.

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Why are “Relayed” multicast packets are not received? [migrated]

I wrote a test program to diagnose multicast routing problems. The program has several modes of operation: sender (send out a number of multicast packets) receiver (receive a number of multicast ...
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WCF Discovery on Windows Server 2019 getting ICMP Typ 3 Code 3

The problem: I've installed Windows Server 2019 and I am trying to discover my WCF services running on a Windows Server 2012R2. But that's not working and in Wireshark I see a ICMP Destination ...
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How can I send multicast UDP between 2 servers connected via cross-cable?

We have 2 servers (Centos 7) with Solarflare cards directly connected as 172.16.1.1 and 172.16.1.2. The servers also have other network interfaces. I'd like test sending UDP multicast packets from ...
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Allow outbound only on a single port from a multicast zone

We have a LAN zone using addresses that start with 192.168.6.x. The zone carries multicast traffic (2 way radio traffic). We also have 2 WAN zones for our external ISP connections. We have a need to ...
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Which VLANs need IGMP snooping?

My approximate understanding is that switches and similar L2 devices employ IGMP snooping to prevent multicast "streams" from propagating out of ports that have no multicast clients ...
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Receive UDP multicast stream inside container without setting network to host

On a Ubuntu host I receive a UDP multicast Video Stream when listening to the address udp://239.255.1.22:5005. I am trying to start a docker container on the same Ubuntu host and access the UDP stream ...
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Multicast not received when socket is bind to bridge interface on linux

I have bridged eth0 and eth1 to br0 on a linux system. No other interface on the system, only one default route. I want to receive mutlicast traffic with a gstreamer udpsrc. When setting the interface ...
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Regarding service discovery using mDNS

I am a student, trying to familiarize myself with service discovery. I have a server, which supports the mDNS protocol. On its run, it is supposed to advertise services on the network using DNS SRV ...
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Forward multicast and broadcast packets over subnets

I am trying to receive packets from the local network, including specifically broadcast and multicast on device B, which is connected to the local network though device A which is acting as a router ...
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27 views

Using multicast DNS to broadcast name of my machine like raspberrpi does

Raspberry pi has a feature where when it's connected to a LAN, you can find its IP using raspberrypi.local (source). It mentions multicast DNS. I'd like to do this for my own linux devices on LAN, ...
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How to make reverse mDNS through IPv6 on OSX?

I am looking for a way to make reverse mDNS query on OSX over IPv6 only. I am not interested by solution using IPv4. The following works on Linux with dig 9.16.1: dig +short @ff02::fb -p 5353 -x 2001:...
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Why 224.0.0.1 traffic is filtered by Linux hosts?

When sending an ICMPv4 echo request to a destination address like 224.0.0.1, it is ignored by Linux hosts receiving the request. The destination MAC address used is 01:00:5e:00:00:01. The only way to ...
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How to disable / remove multicast completely?

On one of my Windows Servers (Windows Server Standard 2019), I'd like to remove multicast handling completely. Completely really means completely - completely ignore incoming multicast traffic, and ...
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Multicast not working on macvtap device

I have a problem with my virtual network and IPv6 network discovery (multicast traffic). (The setup might seem a little bit involved and I don't remember the exact reasons for every design decision. ...
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No IGMP Proxy in Routing menu in RouterOS 6.47.1

I've successfully installed a multicast package on my Mikrotik HAP ac^2 router. Now I have multicast in the list of packages: But I'm still have no "IGMP Proxy" choice in the "Routing&...
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Router using smcroute stops routing multicast after some time

I have a problem with multicast routing on a "from scratch" (Debian, not LFS ;)) linux router/firewall. At home I've set up a user and a server net. Between the two is a router/firewall (...
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High CPU usage on Cisco WS-4900M by multicast(PIM-SM)

Good evening I have a network with few Cisco routers (WS-4900M and 7606(as main core)) on backbone network and different connected to them l3 switches as client access routers, which receives igmp ...
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Ubuntu transmits TTL 0 multicast packets

IP packets with TTL 0 shall not leave host. But when I start application which multicasts UDP packets with TTL 0, I see packets with TTL 0 leaving host for few seconds, and coming to normal behavior ...
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Add/Remove altnet directives to pimd at runtime?

Our network supports many multicast streams using pimd. Many (but not all) of those multicast streams only flow if we use the "altnet multicast_source_ip masklen 24" statement in the phyint section ...
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multicast on windows 10

I have implemented an app in Android which communicates with another Windows app using multicast. It is working properly on most Windows 10 machines, but on some others the app won't receive ...
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Cannot Create QEMU Socket Networking in Windows Host using Multicast Fails with Unknown Error

I am trying to create a simulated VLAN using socket networking, and the only way to connect multiple VMs in one network in QEMU using socket networking is by using the multicast mcast option of the ...
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739 views

Why don't GCP, AWS or Azure support IGMP multicast/broadcast? [closed]

It's well known that GCP/AWS/Azure do not support IGMP multicast or broadcast. Some state it's because of security concerns, but don't mention what those concerns are. Is there a reason why these ...
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Use interface IP address for response to incoming multicast packet

I have a multicast routing setup with forwarding on the receiving side, as follows (all Linux): +----------------+ +----------------+ +-------------+ | openvpn-server |...
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362 views

Set up multicast route across a middle hop

I have a host with two Docker containers (with NET_ADMIN capability): backend with an interface eth0 (172.16.7.3) openvpn-server with interfaces eth0 (172.16.7.2) and tun0 (10.8.0.1), running an ...
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How can I make my libvirt/KVM guest see all IPv4/UDP multicast traffic?

I have an issue with IPv4/UDP multicast traffic not being fully visible from within a KVM guest. The guest has a dedicated NIC which is attached using MacVTap. Both the host OS and the OS in the ...
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694 views

How can I see multicast traffic from the same host?

On Fedora 30, I'm trying to see multicast packets in another process on the same host. Using netstat, iperf, and tcpdump, I've verified that the group is joined and packets are sent to the multicast ...
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How can I forward port from two multicast addreses with the same port using iptables on debian?

I wrote a multithread program in Python, that analyses traffic from two multicast addresses with the same port, however it looks like my threads don't distinguish from where are datagram's coming. ...
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MDNS response “storm” with “localhost_prl: 127.0.0.1”

We are experiencing occasional performance problems in our WIFI. With Wireshark I see a high number (currently 50/s) of MDNS responses for localhost_prl:127.0.0.1. I don't think that this is normal. ...
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Can a linux client in a multicast network get to know the source ip?

Supose I'm added as a client in a small multicast network with L2 switches and one unique router that is the LHR that uses IGMPv2. Can I (legally if possible) forward some signal that will give me the ...
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589 views

Multicast not reaching application layer - Windows 10

I have a python application that receives multicast packets from one of the ethernet ports set to a static ip on a windows machine. The other ethernet port is a usb-eth dongle configured for another ...
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4k views

“Cannot set device ring parameters: Operation not supported”

I'm trying to change the RX and TX for an HP BL460C server by using ethtool and get the following: ethtool -G eth0 rx 4078 tx 4078 Cannot set device ring parameters: Operation not supported My ...
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485 views

multicast routing between vlan

I am trying to create a multicast messaging service between vlans. When both multicast client and server are in same vlan, the client receives the packet without any issues. When client and server in ...
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791 views

multicast traffic across vlan

Suppose I have a layer 2 managed switch which can be programmed to have multiple VLANs. Lets say there are 2 configured VLANs as of now vlan-1 and vlan-2. I also have a linux machine with 2 ethernet ...
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Multicast for Tomcat servers on Google Cloud

Google Cloud VPC networks only support IPv4 unicast traffic [1], they do not support broadcast, multicast or IPv6 traffic within the network. I have several tomcat servers and I'd like to group them ...
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Multicast communication betwen two subnets connected to one switch

Computers A and and B are connected to the same switch. A is in subnet 192.168.1.0/24, B in 192.168.2.0/24, so they cannot communicate directly using unicast. But what about multicast communication? ...
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Change network interface for multicast subscription

My laptop has 2 network interfaces: ethernet (eno1, 600 Metric) and wireless (wlo1, 1000 Metric) Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface ...
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194 views

cisco 4948 IGMP flooding on all ports

everyone Having trouble with multicast on cisco WS-C4948-10GE (MPC8540). I have two switches running: System image file is "bootflash:cat4000-i5k91s-mz.122-25.EWA9.bin" and System image file is "...
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running snort and IGMP v2 flooding

I am not a network guru so please bear with me. I am running snort on a PLC (running rt-linux) along with an application that needs to communicate with another instance of the same application ...
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Is it possible to configure an IPv6 multicast address to a NIC?

Is it possible to configure an address from ff00::/8 address block to a NIC? Looks like it is not possible: # ip a add ff99::1/8 dev p2p1 RTNETLINK answers: Cannot assign requested address # # ip ...
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203 views

routing multicast trough debian miniPC eth0->eth1

Hello i have probably noob question by i already spent some time on it and messed a local network as well so: I have miniPC for real time log purposes between network and IPTV set-top box. The box ...
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Redhat No IGMP response

I'm setting up my server to ingest a multicast. The server will initiate the request and can join the multicast for about 2:30-3:30 min. After that, it gets dropped from the multicast group due to no ...
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543 views

iptables translate multicast to unicast

I'm attempting to translate multicast traffic to unicast to send over the Internet. I enabled ip forwarding and tried using the following rule: iptables -t nat -A PREROUTING -i eth0 -d 239.0.0.0 -j ...
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WDS stopped working - no servers under Windows Deployment Services 2008 R2

I have three Windows 2008 R2 servers with MDT and WDS installed. It was reported multicasting stopped working on all of them. I made sure the multicast option was selected in the deployment shares' ...
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Forwarding traffic - passive behavior

I spent some time trying to figuring this out. I found my core solution, but iam not satisfied, or more likely i dont fully understand the result, which buggs me. My setting: I have wall plug(port) ...
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Receive multicast frames from different subnets

I'm trying to receive on my LInux box multicast frames from hosts on a different subnet. For the experiment, and ONLY for this experiment, i have two machines connected through a network switch: ...
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Is IPv6 MLD snooping performed by Layer2 Switches over solicited-node multicast addresses?

The NDP protocol makes use of the solicited-node multicast address. A host joins its own solicited-node multicast address group both localy (netsh int ipv6 show joins) and on the layer2 domain (a ...
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Java Multicast Socket doesn't receive anything on Windows

I need to send and receive in multicast. I posted the question on StackOverflow Forum for checking my code: https://stackoverflow.com/questions/50131973/java-multicast-socket-doesnt-receive-anything-...
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Named multicast address

Is it possible to name a multicast or broadcast address? Usually for a single machine I'd put a line in /etc/hosts. Will that work for a multicast address?
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558 views

SSH TAP tunnel & multicast groups

Is it possible to do UDP multicasting over an SSH TAP tunnel? I have set up a TAP tunnel using SSH between my Ubuntu PC and a Raspberry Pi sitting in a remote office, using this command: $ ssh -o ...
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Is my NTP configuration working (with a multicast peer)?

Introduction I'm trying to do some work in which I must receive an NTP update from peers but I'm concerned that there isn't any being received. Here's the output of ntpq -np: remote ...

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