Hello,

this is how you enable WLAN on both radios (2.4 GHz and 5 GHz) on the DIR-825:

Either you follow the description here: http://wiki.openwrt.org/toh/d-link/dir-825

Or you do it like this:

opkg update
opkg install kmod-ath9k wpad-mini

wpad-mini supports WPA-PSK. If you need WPA/EAP/RADIUS, install wpad instead.

Now log into luci at http://192.168.1.1/ and enable and configure your Wifi devices.
Radio 0 is 2.4 GHz and radio 1 is 5 Ghz. Enable both, change to the expert mode, go to Network > Wifi > Radio 0 and 1, and set radio 0 channel to a 6 f. ex. (2.4 GHz) and radio 1 to channel 36 (5 GHz).
For both radios set the country to "US".

Afterwards you can check your settings on the command line like this:

$ uci show wireless
wireless.radio0=wifi-device
wireless.radio0.type=mac80211
wireless.radio0.macaddr=00:26:xx:xx:xx:xx
wireless.radio0.htmode=HT20
wireless.radio0.ht_capab=SHORT-GI-40 DSSS_CCK-40
wireless.radio0.disabled=0
wireless.radio0.country=US
wireless.radio0.channel=6
wireless.radio0.hwmode=11ng
wireless.@wifi-iface[0]=wifi-iface
wireless.@wifi-iface[0].device=radio0
wireless.@wifi-iface[0].network=lan
wireless.@wifi-iface[0].mode=ap
wireless.@wifi-iface[0].ssid=OpenWrt-0
wireless.@wifi-iface[0].encryption=psk-mixed
wireless.@wifi-iface[0].key=SecretKey12345
wireless.radio1=wifi-device
wireless.radio1.type=mac80211
wireless.radio1.channel=36
wireless.radio1.macaddr=00:26:xx:xx:xx:xx
wireless.radio1.hwmode=11na
wireless.radio1.htmode=HT20
wireless.radio1.ht_capab=SHORT-GI-40 DSSS_CCK-40
wireless.radio1.disabled=0
wireless.radio1.country=US
wireless.@wifi-iface[1]=wifi-iface
wireless.@wifi-iface[1].device=radio1
wireless.@wifi-iface[1].network=lan
wireless.@wifi-iface[1].mode=ap
wireless.@wifi-iface[1].ssid=OpenWrt-1
wireless.@wifi-iface[1].encryption=psk-mixed
wireless.@wifi-iface[1].key=SecretKey12345

Please note:
- WLAN scanning does not work when in WPA-mode (hostapd running)
- Luci does not display the TX dBm for the 5 GHz radio
- enabling WLAN only works if you set the right channel. Don't get confused by luci showing wrong channels!
- If you set country=US then you may use channel 1-11 on radio 0 and channel 36, 40, 44, 48, 149, 153, 157, 161, 165 on radio 1.
- I suggest you try with country=US first, even if you are in another country. Use channel 36. If it is working, change the channel to what you like (within the allowed range). If you change to country=DE for example, you will only get the subset of allowed channels from the US range. You are stuck to channel 36-48 then. For further information use forum search for "DFS".

You can also set wireless settings on the command line like this: uci set wireless.radio1.channel=36
To make your changes permanent: uci commit
Documentation for UCI: http://wiki.openwrt.org/doc/uci

You can check if your wifi is woking by running "wifi" on the command line.

That's it.

(Last edited by zoo on 28 Jun 2010, 14:01)

hello zoo. I got one question:

What do I have to do in order to use the 802.11n speeds by using the 5 ghz bands only? is it possible? (I mean using 802.11n on the 5 ghz band)

Thank you

In order for this to work for me, I had to compile my own image and set CONFIG_ATH_USER_REGD=y

Hi,

I followed your instructions and my 2.4GHz WLAN works. But the transfer rates are really poor, windows 7 reports 65Mbps link, and a FTP transfer can't get more that 3MBps. How should I increase this ?