So I have a brand new MacMini straight from apple preinstalled with 10.6.4. Summary of the problem is when downloading a file larger than 1meg after 800k or so the download slows tremendously to 1 or 2k a second when connected to our main private network.
Right out of the box. A brief overview of our network layout: we have 5 switch rooms that go to a core switch which goes to our firewall (which is our DHCP server) then to our router/ISP. We also have two other ISPs, we have a public wireless network and a separate line we have for webcasting/teleconferencing.
So, If the MacMini is plugged in directly to our webcasting line (no DHCP server, it must be configured manually) works fine, beautifully, every download finishes. Same goes if it's on our public wireless, a bit choppier but it completes the job. The MacMini needs to be on our main network where all our file servers are and everything. Without fail between 700k to 900k the download seems to bottleneck. Downloads off our NAS and SAN work just fine so we are thinking it might be a port 80 issue. Every other mac on our network is fine. We switched to several public DNS's and also assigned it a manual ip and tried a static ip and it's the same problem. We have reformatted and applied all the updates, we have used images from working machines and applied it to this machine, and it's the same problem every time. We have returned the MacMini twice and are on our third machine.
I am trying to rule out hardware but i doubt it might be the ethernet NIC on the newer macmini's because I put it on a wireless access point on our private network and the bottle neck still happens.