Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

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 ...

0
votes
0answers
14 views

Symantec Ghost 12 restore image command lines

I have a laptop which is my ghost server (Symantec Ghost version 12.0.0.8065) and I am starting a Ghost session with the command line: ghostsrv.exe "C:\Images\My Image Name.gho" mysession -N1 -C -UU ...
0
votes
1answer
23 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 "...
0
votes
0answers
48 views

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 ...
0
votes
0answers
53 views

Forward unicast UDP traffic (between interfaces) to multicast

I trying to make an RTP scaling cluster, infrastructure diagram below infrastructure diagram picture Every machine have: ipv4/ip_forward = 1 ipv4.icmp_echo_ignore_all = 0 net.ipv4.conf.all....
0
votes
0answers
60 views

Multicasting on a network of switches

I'm a newbie in terms of networking and have been working on a simple multicast networking project for my under-grad. The scenario is that I have to send multicast messages in my campus network which ...
1
vote
0answers
50 views

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 ...
0
votes
1answer
17 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 ...
0
votes
0answers
37 views

UDP multicast on a dummy NICs

I have an Ubuntu virtual machine that makes some end-to-end testing of a software. For these tests I need 3 ips in the same subnet. 2 ips should listen for udp multicast (224.0.0.50:4321) and make a ...
1
vote
0answers
27 views

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 ...
0
votes
1answer
70 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 ...
0
votes
2answers
69 views

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' ...
0
votes
0answers
13 views

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) ...
0
votes
1answer
170 views

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: ...
0
votes
0answers
32 views

ARP and multicast destination address

My server receives (as other hosts on the subnet) multicast requests from some other host. I expect to see the host's address in the ARP table (arp -a) but I don't see it. If the same host ...
2
votes
1answer
112 views

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 ...
0
votes
1answer
236 views

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-...
0
votes
1answer
35 views

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?
0
votes
0answers
29 views

Access multicast sources behind NAT

I have built a specific hardware that sends data to a multicast group(e.g. 239.1.2.3), the scenario is this: I have two instances of this hardware, both identical, so I have two multicast sources with ...
0
votes
0answers
50 views

Netsh event tracing packet capture shows packets; application not getting them

I have many similar Windows 10 machines running a similar set of applications. A number of applications are multicast UDP listeners. They each have massive socket buffers (they could hold 10 sec+ of ...
0
votes
0answers
13 views

Not receiving multicast when system is rebooted

I have two services running on a ubuntu box, onde generating a multicast stream and other grabing this multicast and outputing to a hardware. I'm facing a problem that when I reboot my machine, I ...
0
votes
0answers
60 views

cisco switch igmp snooping

I am trying to add iptv service to my network. I have a device which sends TV channels over multicast streams. My users are connected via access points which all are connected to the switch. I am ...
0
votes
1answer
234 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 ...
0
votes
0answers
236 views

Forwarding traffic to 224.0.0.251

Is it safe to forward 224.0.0.1-meant traffic to another VLAN or will it have consequences such as stop working on the original VLAN? I have these two subnets that are originally conceived to be the ...
3
votes
0answers
104 views

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 ...
1
vote
0answers
691 views

Windows 10 Falls Back to IGMPv2

I have a setup where I have a Linux server running an 802.11n WPA2 encrypted Wi-Fi network. There are two devices connected to this network. One is a device which generates reports and the other is a ...
-1
votes
2answers
2k views

Do all ethernet switches support multicast, even the cheap ones?

I'm playing with LANs here at home and I want to support multicast. Do all switches nowadays support multicast? Even the cheap ones? I'm buying a 5-port gigabit switch at Amazon for $15. Will it ...
0
votes
0answers
95 views

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 ...
1
vote
0answers
78 views

What does having a network that would allow a multicast address to find host computers mean?

I'm dealing with a scenario with a service that's saying the following: "... [this service] uses multicast address 239.170.165.207 on port 49838 to find host computers, so your network must allow ...
2
votes
1answer
143 views

Arista switch - Forward multicast traffic from vlan to vlan on different switch ports with different subsets

I have an Arista DCS-7150S-24-R I got a cross connect from provider X into port #1 (port marked as vlan 100) I got a linux host connected to to the switch at port #2 (port marked as vlan 200) Ports ...
0
votes
1answer
372 views

How can I tunnel multicast traffic?

I am trying to receive multicast on 1 machine, forward it to another machine, and then replay it on that machine. test_env: the machine which has access to the original multicast stream mcast_sender: ...
0
votes
1answer
294 views

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 ...
1
vote
1answer
529 views

How to disable IGMP in Raspbian

I am writing testcases for the IGMP and MLD implementation of a network switch. Those testcases run on Raspbian. However, Raspbian seems to regularly send IGMP reports/queries of its own, which ...
0
votes
0answers
2k views

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 ...
6
votes
0answers
537 views

Why multicast UDP can be slower than unicast UDP?

I have two machines (with Centos 7.3 on both) connected via 1G switch. When I measure UDP thoughput between macines with iperf it gives about 850 Mbit/s. However when I measure multicast UDP thoughput ...
0
votes
1answer
926 views

Multicast causes link down on Mikrotik RB2011UiAS-RM switch2

I am trying to simply push multicast traffic through the second switch of the router... for now I connected swtich 2 port 8 to my ISP router iPTV port and port9 to SagemonUHD88 IPTV decoder. I set ...
0
votes
1answer
245 views

How to find all link local ipv6 devices on a certain interface?

We have a setup where a program on a linux server controls its linux subordinates (talks to them via TCP and UDP). There are several groups of subordinates. Each group is connected via ethernet to a ...
1
vote
1answer
514 views

Multicast port 40000 and safetynetp

I have a vendor that is sending multicast messages using port 40000. When I watch the traffic using tcpdump the port is reporting as safetynetp as can be seen below. The application that is listening ...
1
vote
0answers
878 views

How can I route Multicast between segregated interfaces on Sonicwall

I realize this question might be a little too specific, and I've read all the other questions about multicast on VPN, multicast on multiple interfaces, etc. But, I've applied all the information ...
0
votes
0answers
219 views

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 ...
1
vote
0answers
406 views

STP packets dropped (1 packet every 2 seconds) when irrelevant multicast group joined on the interface

I'm trying to understand weird packet drop issue when joining particular multicast group. I think this issue is related to patch introduced in kernel ver 2.6.37 Beginning with kernel 2.6.37, it has ...
0
votes
1answer
88 views

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 ...
1
vote
1answer
1k views

OS X network stack ignores IGMP membership queries

We have a remote site where the Macs are not responding to IGMP membership queries, but the Windows boxes do respond. Consequently, after about 10 minutes, the IGMP-aware network switch cuts off the ...
0
votes
0answers
167 views

Multicast at high speed over Wifi/AP? higher speed?

I have a small dedicated wifi network setup specifically to carry a multicast multimedia package.. no other use (no web or other data on this network, due to the arrangement). The issue I've found is ...
0
votes
1answer
174 views

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 ...
6
votes
1answer
22k views

Use ip route add to add multicast routes to multiple interfaces

TLDR: Is there a way to use "ip route" to add multicast routes for multiple NICs? We have software that uses two multicast groups to communicate with two different groups of devices on two separate ...
0
votes
1answer
574 views

How to ACCEPT multicast connection with iptables's rule?

I obtain this row with iptables logging option: IN= OUT=eno49 SRC=192.168.0.72 DST=224.1.0.2 LEN=196 TOS=0x00 PREC=0x00 TTL=5 ID=53310 DF PROTO=UDP SPT=9100 DPT=8100 this packet is DROPPED I think ...
0
votes
1answer
266 views

Is it possible to override the destination MAC of multicast frame via a static ARP entry?

I have what I believe is a somewhat obscure question. I have a very specific use case here, so please consider this question purely academic. I have a device (running Linux 2.4 kernel) which ...
0
votes
0answers
569 views

Disable Multicast in Cisco SG300

We have installed multiple Cisco SG300 switches in our network. Recently our network got slow and there was some ghost traffic seen. In order to find the issue, I had run Wireshark and found Multiple ...
1
vote
0answers
388 views

Wrong Multicast MAC address with more than one network interface

I am trying to subscribe to a multicast group from a Red Hat machine with four network interfaces, each one is on a different subnet. It only works if I bind the multicast socket on the network ...
2
votes
2answers
156 views

Can FOG and/ or WDS do multicast over an ordinary unmanaged Gigabit Switch? or does it need hardware with specific multicast features?

Can FOG and/ or WDS do multicast over an ordinary unmanaged Gigabit Switch? or does it need hardware with specific multicast features? Trying to help a small non profit in Asia with a poor budget. ...