I've just updated to El Capitan from Yosemite on my main machine. If I connect to a 10/100 router, I can get a 100Mbit/s link to it. However, if I connect to a Mavericks machine over a LAN cable (direct connection), I get only 10Mbit/s. Before the upgrade, I could get GbE to it without issues.
Could El Capitan not connect at 100Mbit/s or Gb to Mavericks over direct connection? Does anyone know how this could be fixed?
I've managed to get 100Mbit between the two boxes now, but it had to be forced. However, I still can't get GbE like I used to. One thing though: Mavericks doesn't offer GbE flow-control but El Capitan does - could this be an issue?