Some hints for your Linux/FreeBSD netbook using the BQ with USB tethering as a router to Internet

Disable Wifi in the phone and in the netbook (if the Wifi there is not routed to Internet);
  1. 1.
    Enable USB network with the phone;
  2. 2.
    Adjust default route and DNS (/etc/resolv.conf) in the netbook to the IP of the phone;
  3. 3.
    Restart sendmail in the netbook; and all is fine
I crafted a script /usr/local/etc/devd/ for this:
# change routing (...) to the Ubuntu phone BQ Aqaris E4.5
ifconfig ue0 || {
printf "interface ue0 not found -- exit.\n"
exit 1
ifconfig wlan0 down
route delete default
killall dhclient
rm -f /etc/resolv.conf
dhclient ue0
# route add default
test -f /etc/resolv.conf || {
cat < /etc/resolv.conf
# Generated by ~guru/
/etc/rc.d/sendmail stop
sleep 3
/etc/rc.d/sendmail start
This script is executed on the fly (i.e. on plug-in of the USB with tethering enabled) by a FreeBSD devd(8) hook in /usr/local/etc/devd/bq.conf:
# When the interface ue0 comes up we do in a script:
# 1) start of dhclient for interface ue0
# 2) default route to interface ue0
# 3) restart of sendmail
# , June 2015
notify 1 {
match "system" "IFNET";
match "subsystem" "ue0";
match "type" "ATTACH";
action "/usr/local/etc/devd/ $subsystem $type";
Last updated: Sat Oct 17 13:09:43 CEST 2015