(I had a look at this post here: Downloading a file brings network to a crawl But it doesn't provide any answers for my situation,)
We have dedicated enterprise fibre lines with bandwidth at 2MB/s. If one user watches a video, or downloads a file, the entire network crawls to a halt. Can't browse internet. If I run speedtest, the network crawls to a halt.
This is new behaviour, and may be wiring related with regards to the firewall, but I'm trying to diagnose where the potential issues could be:
20 pc's on the domain network, 2x Fibre in -> 2x Cisco router -> 2x Juniper Firewall -> 2x Dell Switches -> Patch panel -> PC
Each router connects to a different firewall. The 2 firewalls are connected. Each firewall connects to a different switch. The switches are connected. The switches then run to the patch panel and out to the office.
We have failover fibre lines, so if one line goes down, we can immediately switch over to the failover line.
Is there a config issue on the firewalls? Are certain ports set to dedicated priority transfer? There is no COS set on the firewalls.
The domain is a server 2012 R2 essentials server.
Does the network setup sound poor? What could potentially be causing this bandwidth hogging?