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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Which ip is chosen as source ip when sending a multicast packet on a specific interface with multiple ip addresses?

I am trying to send a multicast packet on a network interface with multiple host ip addresses(lets say ips A and B). How can I specify the source ip field of said multicast packet to the host ip that ...
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Multicast client keeps leaving group every 5 seconds

I have 2 HP DL360P Gen10 with a Windows 10 VM (IP 10.10.1.1) inside it. It is trying to join a multicast group (228.40.0.227). However, based on the wireshark capture (image below), this client is ...
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What are the downsides of using IPv6 Multicast for majority of all communication including one-to-one?

Given IPv6 Multicast allows for a sub-pub communication model, it seems like a no-brainer for the vast majority of communication, but its very rarely used beyond video streaming, and I'd like to know ...
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Multicast resolution overrides hosts file on Windows 10

I have a Windows application that publishes itself with a DNS multicast record. Let's say myapp.local. When it is installed, it stores a record in hosts file under systemroot/drivers/etc folder. 127.0....
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CARP getting confused with 2 interconnected switches and bonding

I'm having a pretty straight forward 10G switch setup: +-----+----+ +-----+----+ | |port2 ISL port2| | | switch A +--------------------------+ ...
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I want to test IGMP capability of a OpenWRT based router. How caan i test?

This is what I want to test out, SEE IMAGE: Router connected to users and is accessible over the internet as well PC1 and PC2 should be able to join some group(s). Should be able to leave group as ...
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Does Windows automatically leave unused multicast groups?

When troubleshooting multicast, I found no reference on the meaning of the fields returned by this command: C:\Users\Administrator>netsh int ip show joins level=verbose Interface 5: Ethernet0 ...
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up directive not working when dhcp is selected in /etc/network/interfaces.d/eth0

I have to add the multicast route, that is needed when no default gateway is configured. Mono needs this in order to join multicast groups. The configuring is done in /etc/network/interfaces.d/eth0 ...
Holger Böhnke'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 <------...
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route packets from specific hosts to virtual device

PIMv2 I think the issue is with multicast. I want to create a GRE tunnel that supports multicast PIMv2. I am seeing the server sending PIMv2 Hello messages to my gre tunnel but my machine is not ...
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How to configure bird OSPF for ipip link?

I have a simple ipip tunnel between 192.168.56.254/31 and 192.168.56.255/31. My simple test config on 192.168.56.254/31 looks like: protocol ospf test { import none; export none; ...
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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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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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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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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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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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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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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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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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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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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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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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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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What routing/topology protocol(s) should be used with P2P devices with sporadic, changing connectivity?

I have several IoT devices that will sporadically come into and out of range, and connect in a partial mesh topology. For illustration purposes, imagine the interconnectivity of a Web of Trust, or ...
makerofthings7's user avatar
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Change linux multicast interface

Why my multicast traffic always goes through wlan0 interface? I try ip route add 224.0.0.0/4 dev lo ip link set dev lo multicast on ip route flush cache But VLC casting to 224.0.0.1:1111 always ...
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OpenVPN and multicast routing

I have setup an OpenVPN server for remote clients to access a server that will be sending them multicast traffic, however I am unable to receive any multicast traffic. The application makes a ...
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OpenVPN: possible to block multicast traffic in bridged mode?

I have a bridged-mode VPN using two DD-WRT routers connected to cellular modems. To avoid excessive bandwidth usage and fees, it would be nice to block multicast traffic originating from Allen ...
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Best practices for setting up multicast destinations

I am setting up a small LAN(20ish hosts) with a many devices which output multicast traffic. I am able to select their destination IP address and port number. There are 1-10 computers on the LAN which ...
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multicast in private network

I'am confused about multicast in a private subnet. Currently I have the following situation: subnet 10.0.0.0/24 NAT router 10.0.0.1 (ubuntu) pc1 10.0.0.2 pc2 10.0.0.3 pc1 and pc2 using the ...
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Cisco Nexus 7000 Multicast IGMP Snooping enabled - packets got to all interfaces

I have connected three servers to Cisco Nexus 7000 switch. Server1 send multicast packets, server2 subscribes to multicast packets and server3 is for the tests. No matter if I subscribe to multicast ...
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how to forward multicast to multicast via iptables

I want to forward incoming multicast traffic to other multicast address listened on my server interface. My machine running on Ubuntu 14.04. Have a incoming traffic on 239.0.0.1 udp port 1001, want to ...
azatuni's user avatar
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Sending multicast over VPN (with buffering)

I am trying to connect two sites using VPN (OpenVPN) to transmit multicasts (IPTV) from one site to another. I have created a layer2 VPN and it works, however, multicasts are very sensitive to packet ...
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Does Ubuntu with Linux 3.5 having TX RX ring buffers or BQL

My linux uname -a command outputs: Linux Davinci001 3.5.0-23-generic #35~precise1-Ubuntu SMP Fri Jan 25 17:13:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux So, does NICs with this Ubuntu machine is ...
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Wifi multicast stream bandwidth limit

i am doing a project with multicast video streaming. The problem i am facing is, in 802.11b and 802.11g WiFi modes the multicast streaming band width is limited to 1Mbps. But the video have a bitrate ...
Anjo John's user avatar
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Does the IP -> Ethernet multicast address mapping ambiguity matter for IGMP snooping switches?

There are 2^28 possible IP multicast addresses, but only 2^23 possible Ethernet (MAC) multicast addresses (http://technet.microsoft.com/en-us/library/cc957928.aspx), which is why e.g. 224.1.1.1 gets ...
Evgeniy Berezovsky's user avatar
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Windows 7 source-specific multicast (SSM)

We are planning to stream video feeds over multicast to managed Windows 7 devices. Does Windows 7 support source-specific multicast at the OS layer (as the receiver)? It appears that Windows XP and ...
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Can heavy UDP traffic create network congestion?

I have three IP addresses using the same gateway. Two of them are configured as a cluster with multicast address setup. If there is a heavy UDP traffic between those two, can that affect the network ...
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How to enable multicast routing in TMG 2010?

I have a TMG 2010 firewall between some office networks, which handles routing and firewalling; I need to let some application-specific multicast traffic flow between these networks; this is UDP ...
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multicast network based on bridges between two hardware servers

+------------------------+ Internet +----------------------+ | Server_1 | | | Server_2 | | VPS1 ---- br0 __ | (router) | __ VPS4| ...
Jeff's user avatar
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Can I use routes to influence which interface address multicast listeners use?

I have a server with multiple NICs on it. Each NIC is plugged into a different, isolated network that is serving multicast traffic. I have a program that listens to the multicast traffic on each of ...
Louis Marascio's user avatar
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Multicast NAT on Juniper router

I am trying to do source NAT on a J-series router (junos 9.2). I have two separate NAT rules setup (using security policies + source-nat interface). One is for regular unicast TCP connections and the ...
John's user avatar
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Casting videos from one PC to multiple displays over an Ethernet Network

have a set of 6 television displays spread over 3 floors and a central personal computer at one of these floors. There exists an Ethernet cat6 cable network in the building with ports at the location ...
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NLB Node Participating in Cluster But Not Listed in Manager

I have a NLB cluster that has been setup for several months and everything is working as expected. After a reboot of one of the nodes I no longer see that node in the NLB manager. It says it's "...
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