reply to MarcMaiden
Re: [Connectivity] Uploads only working on 1 laptop in the house shit. I wrote a reply then walked dog before posting. In the interim your new info makes my questions obsolete so deleted.
2am here and need to sleep.
Your new test sounds like a DHCP issue but first post suggested multiple simultaneous devices worked fine *except* if one attempted a sustained upload. That wouldn't be DHCP.
G'luck with it!
Figured it out!
The MTU (Maximum Transmission Unit) was set too high - It was 1500 which should be ok for comcast, but I guess it was sending packets that were too large which was crashing my network - Not sure why the difference, but setting it to 1470 did the trick!
said by MarcMaiden:Hmm. That doesn't make sense to me but, hey, you got it working.
setting it to 1470 did the trick!