You can't. Dual WAN only works with a standard Ethernet connection, or a compatible 3G/4G adapter.
My usb wifi is dlink dwa-140.
iwconfig wlan0 mode Master
iwconfig wlan0 essid whateveressid
iwpriv wlan0 wds_add
brctl addbr br0
brctl addif wlan0
brctl addif wlan0wds0
ifconfig wlan0 0.0.0.0
ifconfig wlan0wds0 0.0.0.0
ifconfig br0
# create virtual wlan adapter and run HostAP
iw phy phy0 interface add hostap.wlan1 type managed
ifconfig hostap.wlan1 down
ifconfig hostap.wlan1 hw ether 12:34:56:78:90:ab
ifconfig hostap.wlan1 192.168.0.1 up
hostapd /etc/hostapd.conf -B
# start DHCP and DNS
systemctl start dhcpd.service
systemctl start named.service
# connect to upstream AP
wpa_supplicant -D wext -i wlan0 -c /etc/wpa.conf -B
dhcpcd wlan0
# enable NAT
iptables --table nat --append POSTROUTING --out-interface wlan0 -j MASQUERADE
iptables --append FORWARD --in-interface hostap.wlan1 -j ACCEPT
echo 1 > /proc/sys/net/ipv4/ip_forward
Nov 16 16:08:57 kernel: usb 1-1.2: USB disconnect, address 5
Nov 16 16:08:57 kernel: option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
Nov 16 16:08:57 kernel: option 1-1.2:1.0: device disconnected
Nov 16 16:08:57 kernel: usbcore: deregistering interface driver option
Nov 16 16:08:57 kernel: drivers/usb/serial/usb-serial.c: USB Serial deregistering driver GSM modem (1-port)
Nov 16 16:08:57 kernel: usbcore: deregistering interface driver usbserial_generic
Nov 16 16:08:57 kernel: drivers/usb/serial/usb-serial.c: USB Serial deregistering driver generic
Nov 16 16:08:57 kernel: usbcore: deregistering interface driver usbserial
Nov 16 16:09:03 kernel: usb 1-1.2: new high speed USB device using ehci_hcd and address 6
Nov 16 16:09:03 kernel: usb 1-1.2: configuration #1 chosen from 1 choice
Nov 16 16:09:05 kernel: usbcore: registered new interface driver usbserial
Nov 16 16:09:05 kernel: drivers/usb/serial/usb-serial.c: USB Serial support registered for generic
Nov 16 16:09:05 kernel: usbcore: registered new interface driver usbserial_generic
Nov 16 16:09:05 kernel: drivers/usb/serial/usb-serial.c: USB Serial Driver core
Nov 16 16:09:05 kernel: drivers/usb/serial/usb-serial.c: USB Serial support registered for GSM modem (1-port)
Nov 16 16:09:05 kernel: option 1-1.2:1.0: GSM modem (1-port) converter detected
Nov 16 16:09:05 kernel: usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB0
Nov 16 16:09:05 kernel: usbcore: registered new interface driver option
Nov 16 16:09:05 kernel: drivers/usb/serial/option.c: USB Driver for GSM modems: v0.7.2
Nov 16 16:09:11 kernel: ACCEPT <4>ACCEPT IN=ppp0 OUT=br0 <1>SRC=107.170.118.23 DST=192.168.1.2 <1>LEN=60 TOS=0x08 PREC=0x40 TTL=49 ID=27428 DF PROTO=TCP <1>SPT=45778 DPT=5900 SEQ=2195727546 ACK=0 WINDOW=29200 RES=0x00 SYN URGP=0 OPT (020405AC0402080A5EEF4F9E0000000001030308)
Welcome To SNBForums
SNBForums is a community for anyone who wants to learn about or discuss the latest in wireless routers, network storage and the ins and outs of building and maintaining a small network.
If you'd like to post a question, simply register and have at it!
While you're at it, please check out SmallNetBuilder for product reviews and our famous Router Charts, Ranker and plenty more!