Unix and Linux Stack Exchange
Unix and Linux Stack Exchange

Questions tagged [multicast]

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

89 questions
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4 answers

How can I know if IP Multicast is enabled

I have scripts that run IP multicast tests; however, my scripts are failing on a particular linux machine. I know that I can look at CONFIG_IP_MULTICAST in the kernel configuration file to determine whether the kernel was compiled with this. …
Mike Pennington
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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 is the command line I am using to view…
John Dibling
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4 answers

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 application that uses multicast UDP to let other…
Alex
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9
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5 answers

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 30 PCs with uni-cast can be very slow.
Amir Sabeghi
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7
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0 answers

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 in my case my home router. However, I found out…
Hermilton
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7
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4 answers

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 unicast. The sequence goes like this (as captured…
awy
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7
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1 answer

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 special DVB-S streamer (streaming to…
Milan Fabian
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6
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3 answers

Multicasting in Linux

I want to do multicasting in linux for the video/audio/data file transmission. Is there any utility/tool to do so ?
SHW
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6
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2 answers

net.ipv4.conf.all.mc_forwarding: why is my access denied?

On Debian 12.04 LTS I am trying to access the key net.ipv4.conf.all.mc_forwarding by doing : sudo sysctl -w net.ipv4.conf.all.mc_forwarding=1 But every time I am doing this, I get the message error: permission denied on key…
Vladimir Leiv
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6
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1 answer

Centos 6.3 Server ignoring IGMP Queries

I am using a CentOS 6.3 server to subscribe to UDP multicast data, and I noticed that my server doesn't answer the IGMP queries sent by the switch it is connected to. As a result, when I open my multicast socket, I start receiving multicast data,…
Laurent
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2 answers

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 on the firewall as well as UDP port 5353…
mdns
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5
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1 answer

Why would my Linux host suddently stop receiving multicast? All other nics on private network are receiving

Here is my dilemma. Suddenly, as of yesterday, multicast packets are no longer being received from eth1 (private gigabit network) from one node. Routing between all the nodes is fine, no collisions, packet loss, etc. ifconfig info, inet addr, …
Tom G4
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2 answers

How do I forward multicast traffic between 2 different 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 to see users, then creates a tcp connection for…
jc__
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5
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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.igmp_max_memberships=new_limit Anyone have any experience…
schuess
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5
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3 answers

br0 causes to drop multicast connection after 5 minutes

I have these interfaces set up on the router (Linux machine): br0: flags=4419 mtu 1500 inet 192.168.0.3 netmask 255.255.255.0 broadcast 192.168.0.255 bridge name bridge id STP enabled…
k3a
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