Questions tagged [multicast]

For questions about multicast communications and protocols.

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Multicasting questions

Ok, Basic question is this. show ip igmp snooping groups Is not returning the multicast groups I am creating More in-depth explanation. I want to test multicast. I am on a flat network, and I ...
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2answers
91 views

When do UDP multicast streams/frames diffuse?

Please consider my network topology: (Machine A0) --- [Switch A] ============ [Switch B] --- (Machine B0) | ...
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1answer
81 views

Valid broadcast and multicast addressing

The other day I ran across a piece of software configured to "multicast" using the address 255.5.6.7. While I've seen local broadcast (255.255.255.255) and "true" multicast (as defined in rfc5771), ...
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1answer
469 views

Multicast update on wifi network

I hope my question is fine for this group, and if not, I'll remove it as soon as required. Hereis a shot description of our problem: Our system has many clients (about 500) that should be updated via ...
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1answer
367 views

Setting Destination MAC address for RTP/UDP packets

I have a requirement where I have to send the UDP packet to a destination multicast IPv6 address. In addition to that the packets must also have corresponding destination multicast MAC address set. I ...
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1answer
556 views

Reserved multicast addresses

I can see MC address assignments HERE. However, I'm looking for what groups in the 225.0.0.x range represent. I know that the MACs for this range overlap the 224.0.0.x range in some (if not all) ...
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1answer
137 views

PIM mode for low latency video [closed]

What is the best PIM mode for a campus video network? There are several relevant factors: All video is local to the campus. Click to view needs to be fast as possible (Life safety issues) Sources are ...
2
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1answer
694 views

is it possible to register multicast IP addresses?

topic : IPv4 multicast addresses as per IANA docs Is it possible to register these addresses or they are reserved like 0.0.0.0/8, 10.0.0.0/8, 127.0.0.0/24, etc... ? When we read a specific multicast ...
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2answers
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Multicast doesn't get forwarded correctly [closed]

I have a problem with UDP-Multicast with Kubernetes: I have to Kubernetes-Nodes each of them running a pod: Kubernetes-Node-1: - eth0: 192.168.0.2/24 - docker0: 10.1.1.1/24 Pod1 on Kubernetes-...
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0answers
271 views

Don't receive multicast traffic [closed]

I'm using multicast communications with IGMP snooping enable in the switch, I have 6 nodes (A, B, C, D, E, F), 3 sends data to different Multicast address and 3 receive data from every multicast ...
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1answer
182 views

Can communication to broadcast 224.0.0.1 be made to reach hosts outside of the local subnet?

I been asked the question if it is possible for an a IP host to use multicast to address 224.0.0.1 in order to reach (and get a response from) another host which is not on the local network segment ...
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2answers
2k views

Multicast ARP Switch

So a few questions that I've struggled to find firm answers on. 1: Does multicast use arp? So does it ask for a corresponding IP address? I think the answer is no, as it translates the IP to a MAC ...
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3answers
422 views

Filter multicast traffic to WiFi SSID

I have a set of broadcasting devices that are using multicast. Here is the configuration : L3 SWITCH# igmp-snooping interface Vlan-interface280 description BroadcastDevice ip address x.x.x.x 255....
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1answer
58 views

What practical concerns led to the use of multicast?

Answers to a question on SF explain the differences between broadcast and multicast. It is not clear yet for me which practical concerns brought in the usage of multicast. My understanding is that, ...
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3answers
140 views

How would I make a client find a server with an unknown IPv6 Address?

Let me first explain my situation: I am currently in the process of trying to build a solution for managing multiple Internet of Things devices on a network. It should be possible to automatically ...
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1answer
170 views

Question Regarding IGMPv3 behaviour: Multicast Router appears to send Membership Report?

I'm new to how IGMP works. Recently, I was looking at a packet capture: I see that 172.18.1.3 sends a membership query to the all hosts address, leading me to assume that 172.18.1.3 is a multicast ...
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1answer
155 views

Multicast group membership

Context: Studying for CCNA I'm trying to understand multicast. I understand it conceptually, but I'm trying to understand implementation. For instance, in OSPF, how is multicast group membership ...
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3answers
530 views

Untagged customer traffic inconsistently sent over trunk

I have a catalyst 3750 which is giving me a headache. I have several "customers" who all produce an identical mixture of tagged and untagged traffic. I want to take this traffic in and then pass ...
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2answers
1k views

Does a network switch broadcast local IP Addresses?

Please consider the following scenario The router (Linksys E2000) has an INTERNET port where the main network is plugged in. The router has some ETHERNET/OUT ports where a switch, laptop or PC can ...
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1answer
111 views

Regarding PIM sparse mode

In PIM sparse mode, there is a Rendezvous Point.For any receiver, to join the (S,G) group,the last hop router waits until it receives the native multicast stream. Once it receives the native multicast ...
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1answer
496 views

IGMP and Multicast

I have 3 hosts (h1, h2, h3) on my LAN segment and a router with IGMP enabled. Now the host h3 wants to join the multicast group (239.0.0.2 say) Host h3 will send a membership report to 239.0.0.2 (...
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867 views

Multicast on the Internet

In 2016, is IP multicast still a thing not to rely on with IPv4? Is the only alternative still to duplicate packets? Context: This question is related to P2Peers (plural) topology, with one sender and ...
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2answers
463 views

Routing eigrp between socniwall

Hello and good afternoon well i we have to router sending hello to the multicast 224.0.0.10 cisco 800 series in both sides, can i form an adjacency between them even if a sonicwall is between the, ...
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1answer
5k views

Cisco: broadcast and multicast storm control on distribution switches

I just got some already configured switches that are giving a lot of problems on the network with port shutdowns due to storm control policies. Finally after dumping the running-config. I've saw ...
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2answers
162 views

Should the Multicast source in an ASM network be a member of the Multicast group?

What happens if traffic is sent to a multicast group from a host which is not a member of that multicast group ? Does the router keep any information for a valid Multicast source and discard this ...
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1answer
391 views

Multicast and HSRP

Does an HSRP VIP factor into the PIM designated router and IGMP querier election on a segment? Should they be located on the same interface or device? What would be the effects of having them separate?...
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1answer
59 views

How to handle multicast address collisions?

Assume 2 multicast IP addresses IP1 and IP2 whose mac addresses are same due to collision Let's say a host's NIC has joined multicast stream IP1 and another host on the original host's subnet joined ...
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1answer
592 views

Cisco 49XX multicast flooding

I have problem with multicast on cisco 4948. I've got vlan 9 with muilticast, which configured on several ports. Switch floods multicast traffic on all ports configured with vlan 9. It consumes link ...
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1answer
282 views

Understanding IP multicast in linux [closed]

My ultimate goal is to setup IGMP snooping on a linux machine using netfilter hooks. This is for exploratory purposes to understand IGMP protocol. The topology we are using is as follows: | ...
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2answers
1k views

Command “ip nhrp map multicast dynamic” is not being saved into the configuration

For some reason, my Cisco router is not saving the command "ip nhrp map multicast dynamic". The command is recognized but not being saved to the configuration. I am not receiving any errors. Any ...
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1answer
393 views

multicast flow - send and received by same host

I have following issue: I have unit A which is connected to a non configurable switch which is totally flat and this switch is connected to a switch which has capabilities of layer 3 (BATM T5CL3 G ...
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1answer
542 views

Max hosts of subnet IPv6

When a interface takes an IPv6 address it does the DAD mechanism. A NS will be sent to the multicast address "solicited node multicast group address". If there is another interface in this multicast ...
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1answer
112 views

Multiple routed multicast groups on single switch

This is my lab environment: I have two rooms with one L2 access switch each with multiple vlans. The switches are connected to a L3 switch. All routing happens on this switch. I was able to configure ...
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2answers
591 views

NLB Multicast / Source Mac Address

So I've been trying to complete my MCSA, I'm now on 412. Anyway, NLB (network load balancing)... I'm struggling with how it works. Multicast: Each node in the cluster keeps it's own mac and IP ...
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1answer
940 views

Regarding Multicast over the internet

I was going through the use cases of GRE tunnel and see that it is also used to carry multicast traffic over the internet.I understand that multicast IP belongs to class D address which is a public IP ...
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1answer
63 views

Recieving a packet multiple times in a wireless LAN Network using multicast

I need to send a packet to more than one reciever (lets say 30). Assume I don't care that some of them do not receive it now (Application Layer will handle this). Now my solution is to use multicast, ...
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4answers
876 views

Do subnet masks hinder the ability to listen to a UDP multicast?

I have a device connected to an ethernet switch, and my PCs NIC is connected to that switch as well. The device is sending multicast messages to 239.255.255.251 to which I am able to listen. My ...
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3answers
484 views

Is STP used to prevent all traffic looping or just broadcast and multicast?

Let's say we have 3 switches in a logical triangle, each switch connected to the other two. This provides an opportunity for a loop when multicast or broadcast traffic is traveling here. STP is used ...
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1answer
416 views

Multicast forwarding through VLANs for KVM Over Ip [closed]

I'm currently designing a terminal-server architecture, using KVM-Over-IP technology (I'm using Gefen devices) where I have four VLANs: One VLAN for the displays at 192.168.240.0/24 Three VLANs for ...
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2answers
644 views

Does UDP multicast overwhelm the network?

I am curious as to whether udp multicast creates a lot of unnecessary traffic on an internal LAN. I assume the obvious answer to me is yes, but is it enough to congest the switch and slow down all ...
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2answers
361 views

Seeing traffic not addressed to me using tcpdump, how does that work?

I did a tcpdump capture, and when inspecting the reults, I saw some data I couldn't understand. Say the hostname of the box I did the capture on was box1.blah I saw traffic like this: box2.blah:...
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2answers
105 views

Multicasting - How to send a hint to the router?

I found a multicasting example at http://ntrg.cs.tcd.ie/undergrad/4ba2/multicast/antony/example.html. After correcting some errors, this program seems to work fine within our network. I now need to ...
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3answers
49 views

Does enabling dhcp stops broadcasting within the network (currently on static)?

I have recently found the broadcasting in a network which is running on static IP's. If I enable DHCP will the broadcasting stops? Which is the best way to prevent broadcasting?
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1answer
433 views

Is it possible to use group multicast (IGMP) over the internet?

I am looking at building an application that broadcasts audio using my own proprietary protocol. Under the covers I'd prefer to use IGMP or something where 1000 clients don't use 1000 times the ...
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4answers
4k views

List over assigned global Ethernet MAC multicast address

Where are global Ethernet multicast MAC addresses assigned? Is this by Organizationally Unique Identifier (OUI), and if so, is there a homepage that shows all the assigned global Ethernet MAC ...
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1answer
163 views

Users on one VLAN cannot access multicast resources [closed]

Feel like I'm getting closer to fixing my issue... This is the simplified version of the multicast... -No RPF Failure -pim sparse mode on all interfaces -multicast routing enabled I forced a group ...
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1answer
37 views

Is it possible that IPv6 multicast address is shown in the “IPv6 Address” column of the “show ipv6 neighbors” command in Junos?

Is it possible that IPv6 multicast address(i.e address from ff00::/8 address block) is shown in the "IPv6 Address" column of the "show ipv6 neighbors" command in Junos?
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1answer
135 views

Multicast summarization

I was wondering, does it make any sense to summarize(supernet) multicast IPv4 addresses ? Can anyone please explain why yes, or no ?
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1answer
3k views

What is the difference between ARP and BUM Traffic?

Suppose PC1 with IP address 1.1.1.1 and MAC address A.A.A.A wants to send a frame to PC2 with IP address 2.2.2.2 and MAC address B.B.B.B, plus there is a switch in the middle. PC1 doesn't know where ...
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1answer
375 views

How to duplicate multicast source over several multicast addresses

I have a single Multicast source which I would like -for testing purposes- to duplicate over several Multicast addresses, e.g. an host sending packets to 239.0.0.1, I would like the same traffic to ...