Attempting to bypass ISP router restrictions.
Attempting to bypass ISP router restrictions.
You can configure it either by connecting it straight to the ATT router or set it up in another room using Ethernet.
It needs to be linked through Ethernet to the bg320w. Irrespective of any switches in between. If you're setting it up as an extra access point, it's best to disable NAT on your main router and let the access point handle routing. Likely the performance problem comes from your older router—possibly a 2.4GHz model, which is probably quite outdated now.
Consider your options carefully and choose the best fit for your needs.
I ran a speed test using Ethernet to the older router, which supports 150 Mbps. The router is a basic wireless model from Belkin, offering 300 Mbps through an ATT gateway.