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 ...

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Clustering on cloud/VPS providers

I'm wondering if anyone can give some clustering recommendations to me. I'm currently on Linode, which I'm impressed and happy with, but they (along with just about every other VPS provider I know of) ...
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5k views

Wireless Multicast Forwarding on OpenWRT

Good day! We need to connect an STB device over wi-fi to the router. STB uses multicast only. Using udpxy is not possible. Original firmware forwards multicast over wi-fi using mac changing ...
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603 views

Is IGMP multicast traffic to a Xen VM host legitimate?

I run two Xen/CentOS 6.5 based VMs, both hosted by the same company, but connected to different networks (basic /24s w/ a single gateway at .1) in different physical locations. I developed an iptables ...
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376 views

Enable multicast on dummy interface on startup

I have a dummy interface on a Centos 6.3 machine which I would like to use for multicast traffic. The problem is it does not come up with the MULTICAST option by default; I need to manually add it ...
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1k views

How to make sysctl network bridge settings persist after a reboot?

I am setting up a notebook for software demo purpose. The machine has 8GB RAM, a Core i7 Intel CPU, a 128GB SSD, and runs Ubuntu 12.04 LTS 64bit. The notebook is used as a KVM host and runs a few KVM ...
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361 views

Windows Deployment workflow

I've been digging around and getting WDS, WAIK, and the Deployment Workbench all configured and installed on a server we'll be using to roll images out to classrooms. I want to make sure I understand ...
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1answer
1k views

Create NSC-File for multicast streaming with Windows Media Streaming

For streaming multicast I need to create a NSC-file for the players - this file is pseudo-coded by Microsoft. Now I need to create this file for each proxy-publishingpoint. Is there any way to stream ...
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90 views

Receiving multicast traffic on host-only interface

I have a VirtualBox host (linux) with a Windows 8.1 guest. The virtual network configuration for that guest: After disabling auto metric on the host-only Adapter2 (in the guest OS) and fixing it to ...
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90 views

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 ...
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152 views

Multicast not working on hp 5820 switch

I have a problem with getting multicast working on hp a5820 switch. I have 4 vlans vlan 1,20,30,40 with layerv3 vlans, I enabled multicast routing and pim dm and igmp on each vlan. On the vlan 1 I ...
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41 views

IGMP Snooping limitations and when do you start to use PIM?

At a head end I've just inherited, all our multicast streams run on cisco switches with IGMP snooping enabled. Because all these streams are to be kept local and isolated we've never really looked ...
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171 views

How to use Server 2012 WDS advanced multicast features?

First, can I be clear that I already know how to multicast, and using that without a problem. What I would like to know is... how to use the "Improved Multicast Features" that are new for Server 2012 ...
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261 views

Manual Multicast forwarding with Linux router

I have a Linux router (Ubuntu). It is working well with unicast but with multicast routing/forwarding I have some trouble. The problem is that my hosts do not send igmp/mld messages thus the router ...
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253 views

network leave/unscribe multicast group

I have debian based server where I need to subscribe a multicast. After doing it with headless mpalyer I can see the following: root@ca1:~# netstat -g IPv6/IPv4 Group Memberships Interface ...
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29 views

Multicast destination NAT on same network interface, with netem

For testing purpose, in a big network where IT will shoot me if multicast data are not streamed in the right VLAN, I am trying to degrade multicast packets with a server running netem configuration. ...
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72 views

Multicast works only in promiscuous mode

I'm trying to receive MPEG-TS over UDP multicast transport in Arch Linux. So when I run ffprobe -i udp://@224.1.1.240:6000 it hangs forever with no result. Then I run tcpdump and it shows no ...
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55 views

how multicast stream passes when receiving locally

If suppose I have TX application which transmits UDP multicast to 239.0.0.1:1234. And I have RX application which joins multicast (239.0.0.1:1234), and receives this multicast (239.0.0.1:1234). I ...
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32 views

IPSEC on linux with multiple remote ISP

I have configured 2 ipsec VPN connection from my linux server to my clients locations. the reason being the client has two ISPs a primary and a secondary on. The client wants to switch to secondary ...
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44 views

ospf hello not forwarded

I am trying to change the destination ip of ospf hello packet (224.0.0.5) to link local address using iptables rule (DNAT) . It does not seem to work. A similar rule for unicast packet (BGP control) ...
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1k views

Multicast route setup for multiple interface

Currently I have the below eth5 to receive multicast data for 239.1.1.31. It works. $ ifconfig eth5 Link encap:Ethernet HWaddr E4:11:5B:94:E1:F3 inet addr:10.185.2.2 ...
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148 views

ARP Tables on Windows vs Linux

I noticed on Windows Server 2008, Windows Server 2008 R2, and Windows 7 that IP multicast groups joined by a computer are recorded in the ARP table as static addresses automatically. However, the same ...
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239 views

How do get multicast to work on a Cisco AP1240?

I have a Cisco AP1142N in standalone mode acting as a simple AP. On the wired segment of the LAN, there is an Apple TV that is used to mirror laptop screens to a large TV screen. As long as clients ...
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184 views

linux kernel configuration to filter multicast traffic based on interface

I have two virtual interfaces (eth0.2, eth0.3) in my PC. I am sending multicast data from eth0.2 to eth0.2. Multicast data is received in eth0.2 but also received in eth0.3, the other virtual ...
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Unable to ping multicast IP

Let me prefix this by saying I'm not entirely clear on how multicast works. I have the gist of it, but not the underlying functionality. A customer has configured a RHEL6 cluster between two Jboss ...
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100 views

How can I set up multicast tunnel between hosts on the same net

Dealing with AWS, where multicast packets won't travel even between systems on the same net (VPC). Generally, this is not specific to AWS, as this is generally possible in any network (i.e. you have a ...
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226 views

wdsmcast useage and deployment

I'm trying to use WDS multicasting to deploy an image. For some reason I can't get it to connect. Anyone know any guides on how to do this because I followed and few and none are working. I setup a ...
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229 views

Can multiple VLANs be provided with multicast addresses by a single MADCAP server?

Can a single DHCP server provide dynamic multicast addresses for hosts in many VLANs using MADCAP, just like it can provide hosts with unicast addresses via ip-helper? Or from a Cisco perspective, ...
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843 views

Debugging multicast connection over VPN

I'm running Ubuntu 11.10. I have a local application that is trying to receive multicast UDP streams via an OpenVPN tunnel. I have network connectivity to the remote host that is generating the ...
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287 views

Can I Override Multicast Address for One Specific Destination IP?

I have a Windows XP machine that is fitted with two Network cards. One card is used to access the company network and internet and its IP is assigned by DHCP whilst the second has a fixed IP and is ...
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1k views

Problems with multicast under Mac OSX Lion

We have been developing our Java applications under OSX for some time. Since switching to OSX Lion (version 10.7.1 now), we see sporadic issues around multicast packets going into the bit bucket and ...
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UDP Multicast not working without promisc. Already tried rp_filter=0

I'm having issues with multicast traffic in Ubuntu Maverick. It only appears to work when the card is in promisc mode (i.e. if I set it manually, or use a tool such as tcpdump). Adding multicast ...
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Can't get multicast to work (iperf)

I have some problems to get SLP (service location protocol; I play around with the OpenSLP implementation) to work. It uses multicast on 239.255.255.253, port 427. To narrow down the problem I decided ...
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705 views

Multicast Default Interface - upgrade to RH5.5

I have upgraded a server from RH4 -> RH5.5 and we have an interesting issue with multicast. we have multiple NICS on the server, we want the bond0 to default as the default interface. adding route ...
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21 views

Centos. infiniband multicast join failed for status -22

I have a cluster with Linux Centos 6.5 as OS. All the machines are connected by infiniband, the network is working fine but in the /var/log/messages of all the machines I can see the following message ...
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80 views

AWS VPC: Windows server 2012 R2 GRE tunneling to Linux based Peer VyOS

I am asking this question after having spent some time googling and trying to work out some issues which I have with a Windows GRE tunnel in our 2nd environment (amazon AWS VPC) to a router in our ...
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37 views

how to increase inter packet delay for multicast video packets

i have two embedded boards with Linux which stream (multicast) live video with 20Mbps rate. However when i connect both boards to a 100Mb switch ( 1G switch works fine) , video get's corrupted ...
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40 views

Can Checkpoint just forward multicast traffic?

Is it possible to make Checkpoint (I have R77.20) to simply forward multicast packets between different interfaces, without configuring PIM or other multicast routing protocols? Just adding multicast ...
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36 views

Forward multicast IPv6 packet to another interface

I'm working on implementing multicasting for contiki. I've got a couple of Ubuntu VMs on a NAT and an eth0 interface. To one of these VMs is connected a Contiki Border-router (basically a zigduino) ...
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61 views

Pass multicast packets between subnets. Which static routes need to be added?

I have searched forever but cannot find a clear instruction how to set this up. I have a router providing two LANs over bridges LAN 1 on 192.168.1.0/24, bridging two access points (2.5 and 5GHz) ...
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0answers
93 views

Multicast on mGRE tunnels in Debian not working

I'm trying to setup multipoint GRE tunnels within 4 debian-based servers geographically distributed. Network configured, and hosts can see ping or ssh to each other by local IP. But I cannot get ...
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0answers
74 views

Multicast clients successfully join but dont receive any data

Let me start by saying I just have a conceptual knowledge of how the physical networking side of things work so please bear with me. I have a few clients that subscribe to multiple multicast groups ...
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40 views

LINUX adding a second network card block receiving multicast on the first

we have a linux box with one interface card, on wich we do all traffic, both unicast and multicast, everything works well; adding a second network card ON SAME SUBNET, we can no more receive multicast ...
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130 views

Troubleshooting multicast on Ubuntu 14.04 server

I am troubleshooting an issue with multicast on an Ubuntu 14.04.1 LTS server. I have a simple client that subscribes to a multicast group and waits for data. The subscription is successful and shows ...
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98 views

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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76 views

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 ...
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93 views

multicast packets: when are they received with the receivers ip and when with a multicast ip

I am trying to connect 2 computers running jack for audio re-routing. Jack communicates through multicast packets on address 225.3.19.154 (port 19000) by default. I have successfully connected linux ...
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56 views

UDP multicast stream on win server 2k8 R2

so i have 3 mega PCs with win 2k8 installed on them having: 1st) 1 internal NIC and 1 external 2nd) 2 internal NIC and 2 external 3rd) 2 internal NIC and 4 external same stream put on any NIC on 1st ...
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204 views

Multicast server not able to receive multicast packets from other machines

I have written multicast server and client application using boost library. Facing some probleme when I run client and server on different machines. multicast server is not able to get any multicast ...
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778 views

Keepalived: multicast vs unicast

I'm planning to deploy a several keepalived routers to maintain floating IPs for different database clusters. The plan is to deploy a separate VRRP instance on each cluster locally according to this ...
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668 views

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 ...