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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2answers
331 views

MS NLB: why are multicast packets received by all servers on the LAN, not just members of the cluster

I have a MS NLB cluster (Win 2003) which includes just two hosts. The cluster is configured to use Multicast operation mode (not IGMP). For some reason I am seeing packets intended for the NLB ...
1
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0answers
67 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 ...
-1
votes
1answer
154 views

Icecast2 and multicast

Does anyone know if Icecast2 supports multicast? I've been searching for a while and I found nothing on neither docs or FAQ Thanks
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1answer
42 views

Motorolla TeamBadge Issue [closed]

I have A setup of Motorolla EBW100 Team Badges (typical Walkie Talkie). My wifi is configured as Such that it has Multiple SSIDs For different Badges. Like in Floor A I want 10 Team Badges to work ...
2
votes
0answers
115 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 ...
1
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1answer
374 views

IP-Multicast difference between 224.0.0.1-255 and 239.0.0.0/8 block

Whats the difference between: Local subnetwork Addresses in the range 224.0.0.0 to 224.0.0.255 are individually assigned by IANA and designated for multicasting on the local subnetwork only. ...
1
vote
1answer
203 views

Multicast in private LAN with different subnets

after i read Multicast IP Addresses and Multicast accross the subnets I am confused. Configuration: I have two devices in the same network. They may not be in the same Subnet, but ...
0
votes
2answers
843 views

How to disable multicast on a single port

We just finished deploying 2 cisco SG300-28 switches in our network. We're building a voLANte video distribution network, so all ports were enabled to have multicasting support. The problem we face ...
21
votes
4answers
866 views

Pushing Large Files to 500+ Computers

I work with a team to manage 500-600 rented Windows 7 computers for an annual conference. We have a large amount of data that needs to be synced to these computers, up to 1 TiB. The computers are ...
0
votes
0answers
133 views

MDNS multicast requests not received on wired interface

I have a Fedora 17 system with avahi configured to advertise a private service. The F17 is wired to a switch, to which is also connected a wireless AP. The client is wireless. The F17 firewall is ...
1
vote
0answers
880 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 ...
1
vote
1answer
247 views

Multicast File copy with Unicast responses

I'm trying to do some multicast big file copies over to remote clients on the other side of a satellite link. The idea is to minimize the amount of traffic going up to the satellite. I tried using ...
3
votes
1answer
2k views

Multicast doesn't seem to be working on RHEL 5.5

I'm trying to install Oracle Grid Infrastructure on two machines. Their documentation states: You must enable multicasting for the cluster on the IP address subnet ranges 224.0.0.0/24 and ...
0
votes
1answer
187 views

multicast streaming, too much network traffic?

I am thinking of switching our streaming servers to use multicasting instead of registering multiple clients and duplicating the streams manually on the server. It seems to work very well. However, I ...
2
votes
2answers
1k views

Can I test broadcast packets on a single machine?

I want to have a server sending broadcast UDP packets and two other clients, in the same machine, receiving them. Can I do that somehow? What IP address would I use? @gravyface gave me hope but I ...
5
votes
1answer
2k views

Why is pfSense blocking multicast traffic when it is explicitly enabled?

I have a pair of pfSense firewall/routers set up in CARP/XML Config cluster. On the LAN side, the switch also has a pair of servers running corosync/pacemaker/drbd. These are on a different ip ...
0
votes
3answers
639 views

Is there Muticast routing support on a Cisco 3750?

We have a switch (Cisco WS-C3750G-48TS) with only a C3750-IPBASE-M image (not a 'C3750-IPSERVICES-M' license). Is there any kind of multicast support here? All I need it to do is route multicast ...
0
votes
1answer
165 views

multicast network based on bridges between two hardware servers

+------------------------+ Internet +----------------------+ | Server_1 | | | Server_2 | | VPS1 ---- br0 __ | (router) | __ VPS4| ...
3
votes
1answer
76 views

Streaming root/source in multicasting sparse mode

I'd like to verify if I understand multicasting correctly. In a pim sparse-mode configuration, the RP rtr becomes the "root" of the stream for the rest of the configured routers. Does this mean that ...
5
votes
5answers
1k views

Is IPv6 multicast routable over the Internet?

As I understand it, public IPv6 addresses allocated by the IANA will have the prefix 2000::/3. These ip addresses will be routable through the Internet. IPv6 multicast addresses on the other side are ...
3
votes
1answer
1k views

How to monitor a UDP multicast stream on a cisco network, hopefully with SNMP

We have a LAN with 2x Cisco 4500's as gateways running HSRP. We're using Exterity HD IP Encoders to take HD video and put it onto the network as a multicast UDP stream (playable in VLC). I have a ...
1
vote
0answers
145 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 ...
1
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0answers
175 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, ...
1
vote
0answers
622 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 ...
0
votes
1answer
533 views

Multicasting Windows 7 Image

I am trying to deploy some new machines with windows 7 for the first time in our computer labs. We used to use third party imaging software and then run sysprep after the image was copied(XP), but it ...
1
vote
1answer
248 views

Reliable Multicast Programming (PGM) on Windows

I want to use the Reliable Multicast Programming (PGM) protocol on Windows. http://msdn.microsoft.com/en-us/library/windows/desktop/ms740125%28v=vs.85%29.aspx I know Windows support it. However, it ...
2
votes
1answer
370 views

What is the difference between bind, network (interface) and multicast addresses?

The DatagramSocketImpl in Java has a joinGroup method that takes a socket address (IP and PORT) plus the interface address (IP and PORT). I am trying to understand the difference and purpose of each ...
1
vote
1answer
495 views

VMware ESX 5.0 blocking DHCPv6 solicitations in vSwitches?

We have a network on which we're setting up a test IPv6 deployment. Here's the layout: Win2008R2 DHCP VM and Debian Squeeze radvd VM -> vSphere 5.0 vSwitch -(Trunk)-> Catalyst 2960G -(Trunk)-> ...
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votes
1answer
953 views

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 ...
1
vote
2answers
3k views

What does this linux command mean “route add -net 224.0.0.0 netmask 240.0.0.0 eth0”

Could somebody explain what exactly this command means in relation to transmitting and receiving multicast traffic route add -net 224.0.0.0 netmask 240.0.0.0 eth0
7
votes
5answers
692 views

Convey multicast (to another LAN) through WAN disabling multicast

My Server and Client softwares run both on Linux. The Server broadcasts multicast, the Client listens multicast. My Client has to migrate to another site, and unfortunately multicast is not allowed ...
4
votes
2answers
2k views

Multicast routing across two subnets with FreeBSD 9 (Bonjour between subnets)?

I have a FreeBSD 9 router (a Soekris net6501) connected to the internet via a dsl modem (bridged), doing NAT for two internal subnets, 10.0.1.0/24 (LAN) and 10.0.2.0/24 (wifi net). There are routes ...
2
votes
1answer
596 views

altnet parameter into pimd.conf file

I need to route a multicast streams in my private network. I'm using pimd for multicast routing. The multicast routing did not work until I put altnet <multicast_source_ip> masklen 24 to the ...
0
votes
0answers
446 views

vm multicast doesn't work

I have a windows host machine, sending out multicast and on the same machine I have an oracle virtualbox, running a linux VM with a bridged virtual network card, receiving the multicast. This setup ...
1
vote
1answer
1k views

How to setup a static multicast ARP entry with Cisco SG300?

We're running a Microsoft NLB cluster in multicast mode as a loadbalancer. Using our old Cisco IOS switches we propagate access to the cluster to our branches using a static ARP entry in the core ...
1
vote
0answers
219 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 ...
2
votes
2answers
719 views

Troubleshooting UDP multicast on Windows

I'm a programmer, not a system adminstrator, so please forgive my administrative naivete. My software, written in C#, relies on UDP multicasting. One machine, the server, streams events to an known ...
3
votes
1answer
119 views

Server Unresponsive with Spike in Multicast Packets Received

I got a server from UbiquityServers about a week ago, I installed a simple Apache server and it just serves up images. The server is under very little load because it simply is an origin server behind ...
1
vote
1answer
624 views

IGMP V3 support in Linux-2.6.35

I am trying to start a bridge connection and force it to use IGMPV3. The following command will explain my issue better : The below is the output of force_igmp_version before issuing brctl commands ...
1
vote
2answers
4k views

multicast routing - CentOS 5

I'm trying to pass mulitcast stream from interface eth1 (192.168.20.41) to interface tun0 (192.168.100.40) on CentOS 5. I can see incoming multicast stream on eth1: tcpdump -n -i eth1 type=1700 ...
1
vote
1answer
304 views

Catalyst 3560G SPAN session not mirroring IGMP packets

I am developing a device which acts as a multicast host, and want to observe it as it responds to IGMP Queries. My Catalyst 3560G is set up as follows (full config below): Port 0/1 is a TFTP server ...
0
votes
1answer
5k views

multicast and iptables : troubleshooting?

I have secured a linux box, starting with iptables -P INPUT DROP iptables -P OUTPUT DROP iptables -P FORWARD DROP and after adding rules to enable specific protocols and streams. Which are the ...
5
votes
1answer
146 views

ntp multicast address

A silly question probably, but guess I need to ask. If I've got four centos boxes that are acting as ntpd multicast servers, will the multicast address configured in each box's ntp.conf all be the ...
2
votes
1answer
3k views

multicast tcpdump and subscriptions

From the multicast howto: IP_ADD_MEMBERSHIP. Recall that you need to tell the kernel which multicast groups you are interested in. If no process is interested in a group, packets destined to it that ...
1
vote
1answer
367 views

How to send multicast traffic from one vlan to 100-500 other

In addition to prev question How to share multicast traffic to many vlans I recieve answer that solution for my task is mrouted on my freebsd router. But for now i see this problems: mrouted ...
1
vote
1answer
627 views

Multicast with wifi access points

Using 2 consumer grade access points what is the behavior of when multicast packets are sent between them. Consider -> AP1 -> AP2 (Note that AP1 & AP2 are connected over the LAN ports to the ...
1
vote
1answer
459 views

How to share multicast traffic to many vlans

I have linux computer , this computer connected with entire my network via zyxel gs-2200. In this zyxel also connected router with 500 vlans, one by client. On linux computer i have vlc program ...
0
votes
2answers
1k views

virtualization with multicast receive

I need a virtualization solution with the following properties: guest OSes can receive multicast traffic from the host machine. some services running on the guest OS (eg: port 80) can be port ...
7
votes
1answer
2k views

iperf max udp multicast performance peaking at 10Mbit/s?

I'm trying to test UDP multicast throughput via iperf but it seems like it's not sending more than 10Mbit/s from my dev machine: C:\> iperf -c 224.0.166.111 -u -T 1 -t 100 -i 1 -b 1000000000 ...
1
vote
0answers
717 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 ...