TomatoUSB

I am running Shibby "tomato-K26USB-1.28.RT-MIPSR2-110-AIO" on ASUS RT-N16.

I am trying to connect to the internet through USB modem Sierra Wireless Aircard 320U but failed with log below.

As far as I know, the usb modem can be used in ppp mode with interface "/dev/ttyUSB3". I set the modem interface to that interface but failed to connect to internet. I tested the modem in Windows PC and it functions properly.

Please advise how I can make this usb modem work?

Here is the log of the usb modem:

Jun 23 00:27:44 unknown user.info kernel: usb 1-1: new high speed USB device using ehci_hcd and address 2
Jun 23 00:27:44 unknown user.warn kernel: usb 1-1: config 1 has an invalid interface number: 9 but max is 0
Jun 23 00:27:44 unknown user.warn kernel: usb 1-1: config 1 has no interface number 0
Jun 23 00:27:44 unknown user.info kernel: usb 1-1: configuration #1 chosen from 1 choice
Jun 23 00:27:44 unknown user.debug hotplug[1983]: Attached USB device 1-1:1.9 [INTERFACE=8/6/80 PRODUCT=1199/fff/0]
Jun 23 00:27:44 unknown user.info kernel: usb-storage: device ignored

Jun 23 00:29:35 unknown user.notice root: 3G MODEM not found by cdc-acm, option or sierra module. Trying usbserial …
Jun 23 00:29:35 unknown user.info kernel: usbcore: deregistering interface driver sierra
Jun 23 00:29:35 unknown user.info kernel: drivers/usb/serial/usb-serial.c: USB Serial deregistering driver Sierra USB modem
Jun 23 00:29:35 unknown user.info kernel: usbcore: deregistering interface driver option
Jun 23 00:29:35 unknown user.info kernel: drivers/usb/serial/usb-serial.c: USB Serial deregistering driver GSM modem (1-port)
Jun 23 00:29:35 unknown user.info kernel: usbcore: deregistering interface driver usbserial_generic
Jun 23 00:29:35 unknown user.info kernel: drivers/usb/serial/usb-serial.c: USB Serial deregistering driver generic
Jun 23 00:29:35 unknown user.info kernel: usbcore: deregistering interface driver usbserial
Jun 23 00:29:35 unknown user.info kernel: usbcore: registered new interface driver usbserial
Jun 23 00:29:35 unknown user.info kernel: drivers/usb/serial/usb-serial.c: USB Serial support registered for generic
Jun 23 00:29:35 unknown user.info kernel: usbserial_generic 1-1:1.0: generic converter detected
Jun 23 00:29:35 unknown user.info kernel: usb 1-1: generic converter now attached to ttyUSB0
Jun 23 00:29:35 unknown user.info kernel: usbserial_generic 1-1:1.1: generic converter detected
Jun 23 00:29:35 unknown user.info kernel: usb 1-1: generic converter now attached to ttyUSB1
Jun 23 00:29:35 unknown user.info kernel: usbserial_generic 1-1:1.3: generic converter detected
Jun 23 00:29:35 unknown user.info kernel: usb 1-1: generic converter now attached to ttyUSB2
Jun 23 00:29:35 unknown daemon.err openvpn[1178]: write UDPv4: Network is unreachable (code=128)
Jun 23 00:29:35 unknown user.info kernel: usbserial_generic 1-1:1.7: generic converter detected
Jun 23 00:29:35 unknown user.info kernel: usb 1-1: generic converter now attached to ttyUSB3
Jun 23 00:29:35 unknown user.info kernel: usbcore: registered new interface driver usbserial_generic
Jun 23 00:29:35 unknown user.info kernel: drivers/usb/serial/usb-serial.c: USB Serial Driver core
Jun 23 00:29:35 unknown user.notice root: 3G MODEM ready - using usbserial module
Jun 23 00:29:58 unknown local2.err chat[2737]: SIGTERM
Jun 23 00:29:58 unknown daemon.warn pppd[2630]: Child process /usr/sbin/chat -V -t 60 -f /tmp/ppp/connect.chat (pid 2736) terminated with signal 15
Jun 23 00:29:58 unknown daemon.err pppd[2630]: Connect script failed
Jun 23 00:29:59 unknown daemon.info pppd[2630]: Exit.
Jun 23 00:31:04 unknown local2.err chat[3085]: SIGTERM
Jun 23 00:31:04 unknown daemon.warn pppd[3049]: Child process /usr/sbin/chat -V -t 60 -f /tmp/ppp/connect.chat (pid 3084) terminated with signal 15
Jun 23 00:31:04 unknown daemon.err pppd[3049]: Connect script failed
Jun 23 00:31:05 unknown daemon.info pppd[3049]: Exit.