Multicast is a one-to-many distribution. An unmanaged switch treats the multicast traffic as broadcast traffic and impact network performance. Lisa Bock demonstrates a packet capture in which 20% of the traffic is SSDP multicast packets.
- [Instructor] On a network, one of the reasons…for network congestion may very well be multicast traffic.…Now multicast is one to many that are listening…and if you aren't managing that multicast traffic…by using IGMP, or Internet Group Message Protocol,…you may very well have multicasting go across…the entire network.…Now multicast header doesn't have a destination…IP address, and let's take a look.…
There is one of your SSDP packets,…which is a multicast, and there's EIGRP.…Just going to double click that and so you can…take a look at that.…Now this a protocol used to talk to other routers…but here you can see the destination, 224.0.0.10,…and that is the default multicast IP address for EIGRP.…Now, that 224 range is a class d.…
When you're using IP version four,…that range is simply for multicast.…So when we take a look at multicast traffic…the original idea of multicast is that it will…just simply go to the device that's listening…and to nowhere else, but as you can see…a lot of devices, if they're not tuned,…
Author
Lisa Bock
Released
11/14/2018- Tapping into the network
- Baselining the network
- Troubleshooting to discover the cause of a slow network
- Merging traffic
- Sanitizing packet captures
- Capture engines
- Optimizing packet captures
- Basic and advanced IO graphs
- TCP stream graphs
Skill Level Intermediate
Duration
Views
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Introduction
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Enhance your skills1m 5s
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1. Tapping into the Stream
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Enhance your skills2m 7s
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Network architecture6m 41s
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Tap into the network4m 20s
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Baselining the network5m 6s
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Restrictions and limitations6m 45s
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Challenge1m 21s
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Solution4m 15s
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2. Solving Network Problems
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Network congestion3m 24s
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Case study: Spotify4m 12s
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Case study: Multicast3m 55s
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Merging traffic3m 16s
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Sanitizing packet captures3m 33s
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3. Capture Engines and Wi-Fi
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Capture engines4m 22s
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Install Npcap4m 59s
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IEEE 802.11 overview4m 47s
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802.11 packet types5m 14s
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4. Command Line Capture
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Optimize packet captures5m 7s
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tshark and dumpcap2m 33s
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text2pcap and capinfos4m 3s
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capinfos and editcap3m 13s
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5. IO and Stream Graphs
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Basic IO graphs5m 59s
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Conversations and endpoints5m 42s
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TCP stream graphs6m 46s
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Advanced IO graphs4m 35s
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Conclusion
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What's next?1m 13s
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Video: Case study: Multicast