目標:
- 在interface up時，get IP by DHCP前令到modem連線
- 在interface down時，release IP後令到modem斷線
工具:
- comgt: 以指令行方式傳送一堆指令到modem的serial port，以操作modem。例如設定APN、連線、斷線等動作
假設modem的interface名稱為wwan0，Control serial port為"/dev/ttyUSB1"，連線的APN為internet。
檔案"/etc/network/if-pre-up.d/wwan0-pre-up":
#!/bin/sh
if [ "$IFACE" = wwan0 ]; then
/sbin/ifconfig wwan0 -arp
/usr/bin/comgt -d /dev/ttyUSB1 -s /root/script/comgt-wwan0/up
fi
exit 0
檔案"/etc/network/if-post-down.d/wwan0-post-down":
#!/bin/sh
if [ "$IFACE" = wwan0 ]; then
/usr/bin/comgt -d /dev/ttyUSB1 -s /root/script/comgt-wwan0/down
fi
exit 0
檔案"/root/script/comgt-wwan0/up":
opengt
set com 9600n81
set senddelay 0.05
waitquiet 2 0.5
send "AT\^"
send "NDISDUP=1,1,\"internet\""
send "^m"
exit 0
檔案"/root/script/comgt-wwan0/down":
opengt
set com 9600n81
set senddelay 0.05
waitquiet 2 0.5
send "AT\^"
send "NDISDUP=1,0"
send "^m"
exit 0
Add new comment