Questions tagged [multicast]

For questions about multicast communications and protocols.

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What are “Unicast identity tokens”?

I was reading an introduction to IPv6 which talks about the depletion of IPv4 addresses. I came across the following line: As noted in RFC 5735 a number of address blocks are reserved for users ...
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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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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
5k views

Which VPN Types/Protocols inherently support Multicast Traffic?

At my work, we build mobile networks from scratch for customers regularly. (Mobile Networks: think battery powered LTE router with wifi.) Since we build from scratch we can be vendor agnostic and ...
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1answer
385 views

Juniper EX4600: multicast not working in vlan default. [closed]

I have a Juniper EX4600 switch which I'm using for host connectivity (obviously). Now I need to set up a VRRP/CARP between two hosts that are in the same vlan, and it's the default one. Surprisingly, ...
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1answer
557 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
603 views

Unable to route multicast from IPcam (four vlans, one switch, one router with router-on-a-stick)

Okay, so I've been searching far and wide for a solution to my problem here. I want to be able to access an IPcam through its respective software across VLANs. Hardware: Cisco 1841 Router, firmware ...
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1answer
320 views

802.11 multicast buffering due to random back-off mechanism

I am trying to achieve periodic multicast with WAP (Wireless Access Point) [basically trying to stream real time audio data to multiple devices]. The regularity in the interval between successive UDP ...
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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
465 views

Understanding multicast destination mac addresses

I'm currently learning about how to convert between a multicast ip address and the destination mac address. I fully understand the terminology, how to do the conversion, and why the 23 bits, instead ...
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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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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
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 ...
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2answers
91 views

How to design a wireless network for efficient multicast or broadcast communications?

First, a little bit of background information: I'm working on some custom software that allows a group of computers on the same LAN to co-operate on a real-time task in a distributed, fault-tolerant ...
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3answers
6k views

How do I forward multicast packets over IPSec VPN Tunnel on Juniper SRX?

I have an IPSec site-to-site VPN setup between two SRX300 devices. I am trying to get multicast to travel across. I am looking for the simplest configuration possible to get this setup. I have found ...
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1answer
481 views

How do i route and permit Airplay traffic from one network to another? [closed]

I have a guest network and a corporate network. There is a firewall (Cisco ASA) and a router (3750G L3 switch) sitting between these networks. All of my Apple TVs are on the guest network side. My ...
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3answers
531 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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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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1answer
1k views

Multicast timer expires

I've a multicast network for security cameras (multiple RPs, bsr, connectivity with OSPF). The problem is that the monitors sometimes stop receiving the video stream. (10.0.0.1, 234.0.0.1), 00:10:11/...
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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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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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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
851 views

How does address resolution work with multicast, specifically IPv6?

If I want to send an IPv6 UDP multicast message, how does L3 to L2 address resolution occur? I think I understand ARP and how this same idea applies to unicast, but I am struggling to grasp the idea ...
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0answers
2k views

Regarding vPC Dual Active or Split Brain scenario

Consider the below topology: Imagine that both the vPC peer keepalive link and vPC peer link have gone down. I am trying to understand how will that lead to unpredictable traffic flows or loops. ...
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1answer
824 views

Multiple VLANs under one subnet (for traffic control)

Looking at a fiber ring network of 11 switches on the same subnet, with 3 types of devices per module (device 1, 2 & 3). control room switch 192.168.11.100 module 1 ethernet switch 192....
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1answer
374 views

Enabling Multicast Listener Discovery (MLD)

Do standard NICs that support IPv6 have the ability to perform MLD? Essentially I understand MLD, but am struggling to find if it needs to be configured or if it is enabled by default on a host. Just ...
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1answer
941 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
376 views

Cisco 4948 - multicast routing

Could anyone help me with Cisco 4948 config? I have to route multicast traffic from one Vlan to another. Multicast source and multicast destination are IGMP-enabled devices, there are no PIM-devices ...
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2answers
392 views

How do you disable IGMP-snooping on virtual nic macvtap

Networking community, Question: How do you disable IGMP-snooping on virtual nic macvtap? Background: We have noticed that Juniper vSRX 15.1X49-D60 (Running on Ubuntu 16.04LTS Server KVM) is ...
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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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1answer
920 views

Can I truly multicast over Wifi AP

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 ...
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2answers
24k views

Can I truly multicast over WIFI?

Am streaming UDP over wifi (5ghz) - approx 1.5k/packet... trying to stream to ~10 devices simultaneously, with extremely low latency.. As I understand Wifi, it can never true multicast, as each ...
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1answer
90 views

What protocols in a Switch/ Network Equipment come into play, to ensure efficient Multicast support for WDS/ FOG image deployments?

Note: These are Operating System deployment tools WDS - Windows Deployment Services (Not the WiFi WDS) FOG - https://fogproject.org/ What "protocols/ capability/ feature/ technical specs" become ...
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2answers
847 views

Is a VLAN relevant for multicast frames?

In a switched Ethernet network is there a use-case for having VLAN tags for frames that have a multicast MAC as destination address? I cannot find a use-case because: VLANs are generally used for ...
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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
485 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
310 views

IP multicast support

I am currently learning about IP multicast. I am confused what support mechanism it needs for it to be used. For e.g support from OS , Network cards etc .. As per my understanding, IP multicast is ...
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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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1answer
2k views

IPTV Cisco configuration for C2960

I have attached a network diagram explaining IPTV network , i have below queries to understand & configure IPTV . All ports on edge switches are configured as access ports in VLAN 101. On Core &...
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2answers
2k views

Setup Linux Multicasting Router for RHEL 6 [closed]

This is my first visit into the world of network multicasting on Linux. I understand how to change the ethernet port configuration and system routing tables to add multicasting. I want setup a ...
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2answers
2k views

Why is MBGP needed?

I've been working on some multicast protocols and I came across MBGP and I want to know why is it needed. The way everyone uses MBGP is that they set up PIM in every routers, and for the inter domain ...
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1answer
482 views

Private Public and Special IP addressing

Is the IP address 224.0.0.0 routable over the internet?
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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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1answer
437 views

Any router will automatically join at least two multicast groups on each interface. How do I see that on a Cisco router?

Any router will automatically join at least two multicast groups on each interface. How do I see that on a Cisco router? I know that they all join these two groups: all multicast nodes and all ...
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2answers
645 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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1answer
245 views

Dell PowerConnect Firmware Update / Kemp VRRP

We just ran into the same problem outlined in this post: KEMP load balancers using UCARP (VRRP) - multicast MAC address not being picked up The only work-around that I was able to do was to disable ...
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1answer
874 views

Recommended Cisco storm-control broadcast and multicast threshold value for user PC

What is the recommended storm-control threshold value of broadcast and multicast on Cisco IOS catalyst switches for ports connected to users?
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1answer
2k views

Why is the NDP Neighbor Solicitation message sent to the solicited-node address?

As I understand it, when Host Alice knows Host Bob's IPv6 address but not its MAC, Alice sends an NDP Neighbor Solicitation (NS) message to the solicited-node multicast address for Bob. Alice knows ...