Simple sounding question. When the wifi is turned on, our small office DSL speeds drop to 0.3 Mbps, with ping up around 1.4 seconds, for both wired and wireless clients. Turning the wifi off instantly picks the speed back up to decent DSL sync rates.
I've tried the changing wifi password to check for leechers. Didn't make a difference. The router doesn't show any unknown devices.
The problem started the day after we picked up a new ADSL modem. But on the same day 20 people moved into the office below us, so it's hard to pinpoint the issue.
I'm seriously stumped.
Internet - Linksys X3000 DSL modem [wifi always off] - Netgear JGS516 Gigabit switch - Apple Airport Extreme Base Station
There are 3 Macs and a printer plugged into the switch (via a patch panel). On the Airport Extreme's wifi there are 2 PCs and 2 Macs, plus a handful of iOS devices, but it doesn't matter, because even if the wifi devices are off, the speed is still slow.
The problem continues if I plug the Airport directly into the modem.