Avatar of theadstudio
theadstudio
 asked on

Despite ample bandwidth something is causing bottleneck in LAN and affecting VOIP

Over the past 2/3 months something in our network is generating a lot of traffic and it is causing VOIP calls to sound garbly and occasional web browsing hiccups. Both the VOIP and the ISP have tested their networks and said all seems well.

Question: is there a software or service that allows me to visually understand if the issue is due to a specific computer running some sort of bandwidth-sucking software or perhaps some malware generating insane outbound traffic?

We have even received a warning page when accessing Google telling us that there is too much traffic coming from our network and asking us to prove that we are humans by filling a Capcha screen.

Our basic configuration:
100mbps / 20mbps Cable Internet, consistently testing at the advertised speed
Gateway is a CheckPoint 600 appliance, doubles as UTM and firewall, QoS function enabled
3 unmanaged switches at key points in the network (including 2 Ciscos)
About 20 users on the LAN plus some stuff on wi-fi
16 VOIP phones, not very actively used
Do not believe there are any p2p/torrent users or something like that going on
Degradation in VOIP quality happened recently and NOT as a result of any significant changes in the network

I am puzzled by this, first time in 20 years that I have encountered a network issue that stumped me.
Network AnalysisNetwork ManagementNetwork Operations

Avatar of undefined
Last Comment
Bryant Schaper

8/22/2022 - Mon
SOLUTION
hypercube

Log in or sign up to see answer
Become an EE member today7-DAY FREE TRIAL
Members can start a 7-Day Free trial then enjoy unlimited access to the platform
Sign up - Free for 7 days
or
Learn why we charge membership fees
We get it - no one likes a content blocker. Take one extra minute and find out why we block content.
Not exactly the question you had in mind?
Sign up for an EE membership and get your own personalized solution. With an EE membership, you can ask unlimited troubleshooting, research, or opinion questions.
ask a question
ASKER CERTIFIED SOLUTION
Bryant Schaper

Log in or sign up to see answer
Become an EE member today7-DAY FREE TRIAL
Members can start a 7-Day Free trial then enjoy unlimited access to the platform
Sign up - Free for 7 days
or
Learn why we charge membership fees
We get it - no one likes a content blocker. Take one extra minute and find out why we block content.
Not exactly the question you had in mind?
Sign up for an EE membership and get your own personalized solution. With an EE membership, you can ask unlimited troubleshooting, research, or opinion questions.
ask a question
Experts Exchange is like having an extremely knowledgeable team sitting and waiting for your call. Couldn't do my job half as well as I do without it!
James Murphy