I have asymmetric DSL with download up to 20Mbps and upload only 2-3Mbps. Service provider is ATT. The problem I've been having for the last few weeks is that the network speed can jump from say 20Mbps down to 4Mbps download in just one hour, then back up an hour after that. I use att.com/speedtest to check the speed. Interestingly my Ethernet connections also change speed, something ATT says should not happen.
I have lots of devices on the home network (4 operating systems in terms of computers: ubuntu, win7/8, chrome and osx + a number of other devices in terms of phones, ipods, bluray, tv, nintendo wii, network printer, etc etc.). However they are not all on the network at the same time.
I don't recall anything changing around the time I started having problems. I do have a DSL modem with wireless but I have it connected to a wireless router that I use for the network. Several reasons for this, one being that a while back I had a DSL modem w/o wireless capability. Also the DSL modem seems to have problems more frequently and if I need to swap it or upgrade service, with a wireless router I don't need to reconfigure anything on my network. I have tried adjusting the wireless channel which doesn't seem to make much difference. ATT told me to turn off the DSL modem wireless broadcast, but that doesn't matter either. I do see that the wireless network speed out of the router is about 15% less compared to the modem. Not sure if that's an indications of anything.
Any thoughts anyone?