I've been trying to figure this problem out for awhile now. I currently pay for Blast! 105/10. I have my E4200 plugged into a Motorola SB6121, and when I use a computer plugged via ethernet directly into the E4200, I receive over 105 download speed, and over 11 upload speed (via speedtest.net).
However, the problem occurs when I connect via wireless network from my laptop positioned less than 10' from the router. Its a B/G/N laptop wireless network card (Intel Centrino Wireless-N 2230) which should allow me up to 300 Mbps. I am receiving only about 70 Mbps (via speedtest.net). This may not seem like a big deal, but I'm trying to get the most out of what I pay for, and trying to eliminate any bottlenecks that I may have in my network setup.
So I've flashed my E4200 to the latest firmware (Smart Wi-Fi v. 2.1.41.162351) and set my router up as follows:
Wireless:
2.4 GHz network:
Network mode: Mixed
Security Mode: WPA2 Personal
Channel width: Auto
Channel: 11 (chosen by inssider wifi helper)
5 GHz network:
Network mode: Wireless-N only
Security mode: WPA2 Personal
Channel width: 40 MHz
Channel: 153
Connectivity:
Nothing much here, but IPv6 is enabled, and tested via the comcast test website.
Nat: Enabled
UPnP: Enabled
MTU: Manual (1500)
DHCP Server: Enabled
Security:
Firewall:
IPv4 SPI firewall: enabled
IPv6 SPI firewall: enabled
VPN passthroughs all enabled
filter anonymous internet requests and filter ident (port 113)
No DMZ or port forwarding
Media Prioritization:
Prioritization: off
Settings:
Downstream bandwidth: 0
WMM Support: On (required for wireless-N networks, my speed is *Much* slower without this on)
That's really it as far as customization is concerned, again only 75 Mbps download speed, but 11 Mbps upload speed. Connected via ethernet it's over 105 Mbps download and still 11 Mbps upload speed.
Any idea what my problem might be?