How to set up a Huawei E1820 3G modem on FreeBSD 10.0-RELEASE

gistfile1.txt

1) Load the u3g(4) driver:

# kldload u3g
# kldstat
Id Refs Address            Size     Name
 ...
 7    1 0xffffffff81b6e000 5ffb     u3g.ko

2) Set the driver to load at boot:

# echo 'u3g_load="YES"' >> /boot/loader.conf

2) Get the vendor and product IDs using lsusb(8):

# pkg install usbutils
# lsusb                                                                                                                  
Bus /dev/usb Device /dev/ugen3.2: ID 12d1:14ac Huawei Technologies Co., Ltd.
...

3) Create a devd(8) configuration for the modem:

# cat << EOF > /etc/devd/huawei-e1820.conf
attach 100 {
        device-name "u3g[0-9]+";
        match "vendor" "0x12d1";
        match "product" "0x14ac"; 
        action "/usr/sbin/ppp -ddial saunalahti";
};
EOF

4) Find the TTY name of the modem:

# sysctl -a dev.u3g | egrep '\.ttyname'
dev.u3g.0.ttyname: U0

5) Set the device to modem-only mode (disable the virtual CD-ROM and SD card reader):

# cu -s 115200 -l cuaU0.0
Connected
AT^U2DIAG=0
OK
~.
[EOT]

6) Configure ppp(8). The configuration below has been tested using a Saunalahti
Mobiililaajakaista 3G plan (http://saunalahti.fi/).

- Replace /dev/cuaUX.0 with the value reported by sysctl(8) above.
- Replace the value of the AT+CPIN command (XXXX) with the PIN of your SIM card.

# cp /etc/ppp/ppp.conf /etc/ppp/ppp.conf.original
# cat << EOF > /etc/ppp/ppp.conf
# Run this as root (if you want linkup and linkdown route changes to work)
#
#   /usr/sbin/ppp -ddial saunalahti
#
default:
# set log Phase Chat Connect hdlc LCP IPCP IPV6CP CCP tun
saunalahti:
 set device /dev/cuaU0.0
 set timeout 0
 set dial "ABORT BUSY ABORT NO\\sCARRIER TIMEOUT 5 \
        \"\" \
        AT OK-AT-OK \
        AT+CPIN=XXXX OK-AT-OK \
        ATH OK-AT-OK \
        ATE1 OK-AT-OK \
        AT+CGDCONT=1,\\\"IP\\\",\\\"internet4\\\" OK \
        \\dATD*99# TIMEOUT 40 CONNECT"
 enable dns
 resolv writable
 # Use Google and Level3 DNS
 set dns 8.8.8.8 4.2.2.4
 set ifaddr 10.0.0.1/0 10.0.0.2/0 255.255.255.255 0.0.0.0
EOF

6) Start ppp(8):

# /usr/sbin/ppp -ddial saunalahti
Working in ddial mode
Using interface: tun0

7) Check that the interface is up and has an IP address:

# ifconfig tun0
tun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1500
        options=80000<LINKSTATE>
        inet 84.231.181.159 --> 10.0.0.2 netmask 0xffffffff 
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
        Opened by PID 2263
        
8) Start ppp(8) after boot:

# cat << EOF >> /etc/rc.conf
ppp_enable="YES"
ppp_mode="ddial"
ppp_profile="saunalahti"
EOF