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Network: brodcast traffic

Hi,

1) This is related to the Broadcast Traffic in a network
2) Some say if the network has " a lot of broadcast traffic ", we should consider to create VLan

3) My questions: How do you know that a network has a lot of broadcast traffic already? What are the signs or features that we can see or understand?

thanks,
tjie
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Top Expert 2011
Commented:
You can use network sniffers to see all packets, including broadcasts, that exist in your network. Basically, huge broadcast traffic would decrease throughput in your LAN and sometimes can cause high CPU or LAN card utilization on your PCs
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Commented:
if you have any intelligence device in your network (Such as UTM)...you can easily monitor the broadcast traffic.
you can easily monitor from which port and what ip is broadcasting.
in general broadcast is happening between port 135 to port 138( mainly port 137) and port 445.
 
if you have any NETWORK AUDITING or Network Monitoring software you can easily track them... or else please let us know the domain you are using ..is it LINUX based or WINDOWS based.

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Commented:
My Question: What are the signs or features that we can see or understand?
- the network becoming "slow" or other signs?
- please mention them

thanks
Top Expert 2011

Commented:
From the first post here:

Basically, huge broadcast traffic would decrease throughput in your LAN and sometimes can cause high CPU or LAN card utilization on your PCs
Don JohnstonInstructor
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Top Expert 2015
Commented:
>3) My questions: How do you know that a network has a lot of broadcast traffic already?

Either a protocol analyzer or looking at interface statistics on a router or switch.

>What are the signs or features that we can see or understand?

As fgasimzade stated: excessive network usage and high CPU usage on attached hosts.

The general rule of thumb has been 20%. So when broadcast traffic exceeds 20% of the total traffic, that's when you need to start looking for a solution.

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