Hi Jon,
I've just tried setting up my USB NIC and it was pretty straightforward. I installed the drivers (mine aren't included in the kernel) and did a "yum install app-wire*". From there I configured the Wireless Access Point settings with WPA-PSK mode and also configured the IP Settings as Role = LAN and Type = Static. I gave it an IP on a different subnet from my normal LAN subnet. I did not even have to configure the DHCP server. It was automatically enabled. Initially I could not connect so I rebooted and it all worked.

From your set up, you should not need to install rt2870.bin as it is already in /usr/lib/firmware.

I notice you only have one other NIC in your log dump. Can I check you are in Gateway mode? Also is the Webconfig Wireless Access Point running?

Otherwise can you try editing your /etc/sysconfig/network-scripts/ifcfg-wlp0s12u2 manually? My equivalent looks like:

DEVICE=wlp0s18f2u4

TYPE="Wireless"

ONBOOT="yes"

USERCTL="no"

BOOTPROTO="static"

IPADDR="192.168.199.1"

NETMASK="255.255.255.0"

It is the last three lines you would need to fix. After that you will need to restart networking or reboot.

For reference, my hostapd.conf looks like:

#

# For more information, look here:

#

#	http://wireless.kernel.org/en/users/Documentation/hostapd

#



ctrl_interface=/var/run/hostapd

ctrl_interface_group=wheel



# General settings

#bridge=br0

interface=wlp0s18f2u4

driver=nl80211

hw_mode=g

channel=6

auth_algs=1

ssid=test

macaddr_acl=0

ignore_broadcast_ssid=0

ieee8021x=0



# Wireless N

# wme_enabled=1

# ieee80211n=1

# ht_capab=[HT40-][SHORT-GI-40][DSSS_CCK-40]



# WPA

wpa=3

wpa_key_mgmt=WPA-PSK

wpa_passphrase=my_passphrase

wpa_pairwise=TKIP

rsn_pairwise=CCMP

wpa_group_rekey=300

wpa_gmk_rekey=640