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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1answer
26 views
how to receive MAC multicast packets based on VLAN interface?
can any one pls help me in the following question.
Background : Two PC's(PC1 n PC2) with two VLAN interfaces in each (eth0.2 and eth0.3) respectively.The PC's are connected by WRT54GL router in ...
1
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1answer
27 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 ...
2
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0answers
27 views
+100
Why would IGMP and MLD be required to forward unregistered packets to all ports?
First, a little background: My understanding is that the purpose of IGMP (and its IPv6 cousin, MLD) is to avoid wasted bandwidth by ensuring that multicast packets only get transmitted to ...
1
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1answer
17 views
If I have a process which is supposed to be receiving data from multicast, how can I check if it actually is?
I can check gstack, but just because I see the listener threads on the recv call does not mean that call is not returning. One other thing I thought was to do something like:
netstat -lupe | grep ...
2
votes
1answer
40 views
is there a way to “multicast” a request with haproxy?
I have a configuration with a cloud of servers behind haproxy. Haproxy is loadbalancing between the servers. However there's some action that needs to be sent to each server. Currently I do it ...
1
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3answers
245 views
Should I create a multicast route on RHEL/CentOS for a blind sender?
A CentOS 5 system does not appear to come out-of-the-box with a route for multicast traffic. What it does appear to do is use a default route, if configured. In other words, a routing table like ...
0
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1answer
41 views
Is multicast appropriate for sending a copy of a video chat to a server?
I am creating a p2p video chat app using the libjingle/WebRTC code. I would like to collect a copy of these video conversations on our server for users to watch later - but I don't want to suck up too ...
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0answers
62 views
Why IPTV Headend always connected to Router instead of Switch
in all IPTV infrastructure diagrams, I always see the IPTV headend connected to Router even if the IPTV stream only needed in LAN environment. no one explain why they do that. I am asking because we ...
1
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1answer
49 views
Does the IGMP querier have to be connected to the multicast source?
I've been reading Allied Telesis' guide on configuring IGMP, which has been quite enlightening so far. However, I'm still wondering whether the IGMP querier has to be connected directly to the ...
0
votes
2answers
238 views
Problems with multicasts in “iptables”
My question is related to multicasts and iptables.
I want to allow ICMP and IGMP multicasts from the local VLAN 192.168.1.0/24 as well as from 0.0.0.0 on my CentOS machine, so I added the following ...
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0answers
125 views
Windows 2008 R2 use IGMPv2 instead of IGMPv3? Trying to Join specific multicast group
I was curious why Windows would use IGMP v2 instead of IGMP v3? I have seen many places online where you can set the registry and define v3. I have tried that on my Window 2008 R2 server and ...
2
votes
2answers
93 views
Solaris doesn't know which MAC address to use to send an UDP multicast message
I have a pair of Solaris 10 boxes which are supposed to send multicast UDP packets to a group of hosts. One of them works just fine, whereas the other one does not.
The problem with the second ...
5
votes
1answer
74 views
Why would I ever (really) want to implement dense mode when dealing with PIM routing?
I'm introducing some PIM routing into my network to make some multicast traffic available across routers.
I have read a bit on PIM, sparse mode versus dense mode. After reading, I am trying to ...
2
votes
1answer
81 views
How does iptables determine which packets are multicast?
Are packets assumed to be multicast solely based on their ip address? I've been looking at the RFC 1112 and a quick scan doesn't appear to indicate any other flags on the ip packet.
1
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0answers
119 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 ...
1
vote
0answers
279 views
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 ...
2
votes
2answers
178 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 ...
2
votes
0answers
265 views
Turn on multicast packets in the wired LAN and keep them off the WiFi on ASUS WL-520gc router
After I enabled multicast routes on the ASUS WL-520gc router, whenever there is such multicast traffic (because TV is being watched somewhere in the wired LAN), WiFi is "dead": devices can't even ...
1
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0answers
46 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
101 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
40 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
62 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
175 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
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1answer
157 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
1answer
306 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 ...
20
votes
4answers
518 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
92 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
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0answers
506 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
171 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
592 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
145 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
624 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 ...
0
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0answers
63 views
Support for multicast/broadcast on hosting providers [closed]
Are there any good hosting providers that support servers with multicasting/broadcast? I know EC2 doesn't
I am writing the back-end of an application and would ideally go with with UDP ...
5
votes
1answer
996 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
365 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
141 views
multicast network based on bridges between two hardware servers
+------------------------+ Internet +----------------------+
| Server_1 | | | Server_2 |
| VPS1 ---- br0 __ | (router) | __ VPS4|
...
3
votes
1answer
66 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 ...
0
votes
0answers
136 views
How to multicast on a single subnet
I am administering a subnet where various people set up multicasts on and off. The subnet is switched by a stack of Dell powerconnect switches. If I don't really configure anything, each multicast ...
5
votes
4answers
664 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
655 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
82 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
126 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
473 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
0answers
84 views
Not getting IP from ISP on Multicast Network
Im having an odd issue with my ISP (COMX.dk)
I have a managed access gateway box (Telsay) with three 8P8C ports for use with Internet and Ip-Tv (respectively on different VLANS (so does my ISP tell ...
0
votes
1answer
381 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
162 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
299 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
398 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)->
...
-1
votes
1answer
636 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
1k 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
