Network Capacity

asked 2020-03-19 14:16:34 +0000

jch360 gravatar image

Wondering if anyone has a good method of predicting the capacity of a network? For example, I have a completely controlled network on a SCADA system, so I know exactly how many floats, bools, integers, etc will be going across the network and how often based on schedules. Is there away to say to calculate how loaded the network is. Like say it is 60% loaded. Using bits/s on protocol hierarchy, packet lengths, etc. It doesn't even have to be exact, like something within 5-10% accurate. Any thoughts or ideas on the best way to tackle this? We are constantly adding more data points and just would like to have a proactive response based on data when to upgrade a connection.

Thanks,

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Kinda weird that it's on this page - https://wiki.wireshark.org/KnownBugs/... - maybe this whitepaper on baselines will help:
https://wiki.wireshark.org/KnownBugs/...

bubbasnmp gravatar imagebubbasnmp ( 2020-03-19 19:01:28 +0000 )edit

Can you collect statistics (SNMP, screen scrape, Netflow) over time from the network devices to build a baseline and look for trends (busy periods)?

bubbasnmp gravatar imagebubbasnmp ( 2020-03-19 19:03:24 +0000 )edit

We are pulling data via SNMP to solarwinds. What would be best to look at there? I do not actually have access at this time, but could push for more access. I manage the wireless network out to remote location on a 900 MHz spread spectrum system.

jch360 gravatar imagejch360 ( 2020-03-19 19:21:01 +0000 )edit

Start with your device vendor. Is there a forum, or tech notes on measuring performance?
Does the device have enterprise specific OIDs for utilization?
If using something like this to calculate ifUtil, double check the inputs. Have seen incorrect ifSpeed reported by devices.

bubbasnmp gravatar imagebubbasnmp ( 2020-03-19 19:40:01 +0000 )edit

Thanks! I will work down this route.

jch360 gravatar imagejch360 ( 2020-03-19 21:04:58 +0000 )edit