When running a backup from Windows using rclone.exe, our DHCP server has a hell of a time handing out IP addresses. The server from which the backup is being run, is just a file server. Our DHCP server is separate from this.
What is your rclone version (output from rclone version)
Which OS you are using and how many bits (eg Windows 7, 64 bit)
Windows 2012 R2
Which cloud storage system are you using? (eg Google Drive)
The command you were trying to run (eg rclone copy /tmp remote:tmp)
Sounds like rclone is too effective and is performing too well and saturating your network.
You'd want to limit the bandwidth in rclone if that is the case as it seems your network cannot handle the values that you have or you can always look into packet shaping your network if that is available as that's what I do at home.
That prioritizes items and also puts any rclone traffic in a low priority bucket for me.
Yeah, really slowing down the backup speed isn't the issue, our internet connection is actually very good. I would rather the networking team just configure the switches such that this wasn't an issue.
Without knowing much more about topology and makes of network equipment, I would normally start looking at layer 2 switches wrongly deprioritising broadcast traffic; But you're "only" doing 10MB/sec, which is a nominal 100Mb LAN - surely you use 1000Mb ports for your network nowadays?
Have you checked that the layer 2 hierarchy between rclone system and the external router is not crossing the collision domain of the DHCP server and/or the primary client systems showing problems?
Edit: Also, is anything using real jumbo packets along the same routes? Always a bad thing for blocking ports...