CentOS slowing down entire network, including wifi

Thanks in advance.

I asked this over in the Linux forum, but I believe this may be a more general networking issue, not specific to Linux. Link to my thread over there.

https://www.reddit.com/r/linuxquestions/comments/468uqd/centos_67_slowing_down_entire_network/

Here's the issue in a nutshell. I have confirmed via a few tests that when the CentOS server is connected and on the network, the network goes to hell. This is a home network, including a handful of PC's/Printers/and DVR's.

When the server is on the network, the wifi speeds absolutely tank, the DVRs can no longer communicate with eachother, and the network drops even on wired devices (such as my windows PC)

I see DNS probe errors in Chrome, which then work when refreshing.

I have trouble pinging the router from the server or my windows PC as well. Packet loss in excess of 75%, sometimes completely timing out.

I am running the server on a static IP. In order to ensure there are no IP conflicts, I gave it a number deep into the octet. I do not see any other devices that share the IP on the router, so this shouldn't be a problem.

When the server is NOT on the network, everything is perfect. 0% packet loss when pinging out to 8.8.8.8 for minutes on end, and I can ping the router no problem from the Windows PC.

So...what do?