Re: rtl8192cu not working with Edimax EW-7811Un

[Larry Finger <Larry.Finger@lwfinger.net>]

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On 11/23/2011 10:52 AM, Jan Dvořák wrote:
> On Wed, 23 Nov 2011 16:51:09 +0100
> Stanislaw Gruszka<sgruszka@redhat.com>  wrote:
>> Could you confirm that on previous kernel client mode does not
>> work, and work with that new kernel?
>
> I'll try it when I get home or first thing yesterday.
>
>>> I can't still use hostapd, however.
>> Hmm, I'm not sure if rtl92c works in AP mode, Larry?

When I try it, I get rtl8192cu to beacon, and it is possible to authenticate and 
associate, but the second computer never gets an IP number. I think my script to 
set up dhcpd is faulty, but I cannot find the problem. I attached it - perhaps 
one of you can find what I'm doing wrong. BTW, the script also fails when I try 
to use b43 as an AP, and I know it works.

Larry





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#!/bin/sh
# Script to start/stop a hostapd-based access point
#
# Sample start call "control_ap start wlan0 eth0"
# Stop with "control_ap stop"
#

case "$1" in
start)
	if [ $# -ne 3 ]
	then
	  echo "Usage: $0 start AP_iface NET_iface"
	  exit 1
	fi
;;
stop)
	if [ $# -ne 1 ]
	then
	  echo "Usage: $0 stop"
	  exit 1
	fi
;;
*)
        echo "Usage:"
	echo "$0 start AP-iface net_iface"
	echo "or"
	echo "$0 stop"
        exit 1
        ;;
esac

# Symbols for needed programs

IPTABLES=/usr/sbin/iptables
IFCONFIG=/sbin/ifconfig
DHCPD=/usr/sbin/dhcpd
HOSTAPD=/usr/sbin/hostapd

# Symbols for AP and external interfaces

NET_AP=$2
NET_EXT=$3

# First 3 octets of IP address for the AP

AP_ADDR=192.168.0

# IP address for nameserver

NAME_SERVER=8.8.8.8

# AP Channel, SSID, Encryption method,  and Encryption secret

AP_CHANNEL=1
AP_SSID=test
WPA_SECRET="\"123456789\""
ENCRYPT_MODE=2

case "$1" in
start)
        echo "Starting AP mode for $NET_AP at address $AP_ADDR"
        # Disable packet forwarding
        echo 0 > /proc/sys/net/ipv4/ip_forward
        # Stop any existing hostapd and dhcpd daemons
        killproc hostapd
        killproc dhcpd
        #Set up forwarding
        $IPTABLES -t nat -A POSTROUTING -o $NET_EXT -j MASQUERADE
        $IPTABLES -A FORWARD -i $NET_EXT -o $NET_AP -m state \
		--state RELATED,ESTABLISHED -j ACCEPT
        $IPTABLES -A FORWARD -i $NET_AP -o $NET_EXT -j ACCEPT
        # Enable packet forwarding
        echo 1 > /proc/sys/net/ipv4/ip_forward
        # Get the AP interface in the right state
        $IFCONFIG $NET_AP down
        $IFCONFIG $NET_AP up
        $IFCONFIG $NET_AP $AP_ADDR.1
        # dhcpd needs to have a leases file available - create it if needed
        if [ ! -f /var/lib/dhcp/db/dhcpd.leases ]; then
                touch /var/lib/dhcp/db/dhcpd.leases
        fi
	# Write the DHCP server configuration file
	echo "option domain-name-servers $NAME_SERVER;" > ~/dhcpd.conf
	echo "default-lease-time 600;" >> ~/dhcpd.conf
	echo "max-lease-time 7200;" >> ~/dhcpd.conf
	echo "ddns-update-style none; ddns-updates off;" >> ~/dhcpd.conf
	echo "subnet $AP_ADDR.0 netmask 255.255.255.0 {" >> ~/dhcpd.conf
	echo "        range $AP_ADDR.200 $AP_ADDR.229;" >> ~/dhcpd.conf
#	echo "        option subnet-mask 255.255.255.0;" >> ~/dhcpd.conf
	echo "        option broadcast-address $AP_ADDR.255;" >> ~/dhcpd.conf
	echo "        option routers $AP_ADDR.1;" >> ~/dhcpd.conf
	echo "}" >> ~/dhcpd.conf
	# Write the hostapd configuration file
	echo "interface=$NET_AP" > ~/hostapd.conf
	echo "driver=nl80211" >> ~/hostapd.conf 
	echo "hw_mode=g" >> ~/hostapd.conf 
	echo "channel=$AP_CHANNEL" >> ~/hostapd.conf 
	echo "ssid=$AP_SSID" >> ~/hostapd.conf 
	echo "wpa=ENCRYPT_MODE" >> ~/hostapd.conf 
	echo "wpa_key_mgmt=WPA-PSK" >> ~/hostapd.conf 
	echo "wpa_pairwise=CCMP" >> ~/hostapd.conf 
	echo "wpa_passphrase=$WPA_SECRET" >> ~/hostapd.conf 
        # Bring up hostapd
        $HOSTAPD -B ~/hostapd.conf
        # Bring up the DHCP server
        $DHCPD -cf ~/dhcpd.conf $NET_AP
        ;;
stop)
        echo "Stopping AP mode"
        # Stop hostapd and dhcpd daemons
        killproc hostapd
        killproc dhcpd
	rm -f ~/hostapd.conf
	rm -f ~/dhcpd.conf
        ;;
esac