Tag Archives: Debian

Pepephone 2G on Orange Pi 2G IOT

Recently I bought an Orange Pi 2G IOT. Pretty decent for $10 I would say, not a lot or RAM or CPU, but the interesting thing from my point of view is the 2G modem. Some pictures below with SIM card installed.

So the idea of this post is how to configure this device to connect to Pepephone network with a PIN on SIM. After some testing I finally came up with below wvdial.conf which works for me.

[Dialer defaults]
Modem = /dev/modem0
Baud = 30720000
Dial Command = ATDT
Init1 = ATE1
Init2 = AT+CPIN="XXXX"
Init3 = AT+CFUN=1
Init4 = AT+CGATT=1
Init5 = AT+CGDCONT=1,"IP","gprs.pepephone.com","",0,0
FlowControl = CRTSCTS
Phone = *99#
Username = " "
Password = " "
Stupid Mode = 1
Auto Reconnect = on

Pin entry above should be replaced with your SIM pin.
Execute running wvdial from cli and you should be able to see a new interface named ppp0. Below is a screenshot of both interfaces ppp0 and wlan0.More info here (in spanish).

Script to place in DMZ

So I had to place a small server in my home DMZ leaving it opened to the whole world with the corresponding risks this has. Wondering how to allow access from my home LAN I came up with the following iptables script.



startiptables() {
	if [ ${UID} -eq 0 ]; then
                echo "Your UID is: ${UID}. Execute as superuser please"

stopiptables() {
	if [ ${UID} -eq 0 ]; then
                echo "Your UID is: ${UID}. Execute as superuser please"

statusiptables() {
	if [ ${UID} -eq 0 ]; then
		echo "Your UID is: ${UID}. Execute as superuser please"

case "$1" in
	start)	startiptables ;;
	stop)	stopiptables ;;
	status) statusiptables ;;
	*) echo "usage: $0 start|stop|status" >&2
		exit 1

Pretty simple as you can see. It will allow all connections from inside home LAN and block all unrelated traffic coming from the public, except the related and established ones. Substitute the classic class C on script for your corresponding home/work network.

Setting replication MySQL version 5.5

So the other day I performed an upgrade of MySQL on a linode and notice that it wont start if I kept my old my.cnf file.

[11:47:06] user@linode1: ~ $ echo 'SHOW VARIABLES LIKE "%version%";' | mysql -u username -ppassword | grep innodb
innodb_version  5.5.31
[11:47:20] user@linode1: ~ $ 
131022 08:17:56 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
131022  8:17:56 [ERROR] An old style --language value with language specific part detected: /usr/share/mysql/english/
131022  8:17:56 [ERROR] Use --lc-messages-dir without language specific part instead.
131022  8:17:56 [Note] Plugin 'FEDERATED' is disabled.
131022  8:17:56 InnoDB: The InnoDB memory heap is disabled
131022  8:17:56 InnoDB: Mutexes and rw_locks use GCC atomic builtins
131022  8:17:56 InnoDB: Compressed tables use zlib 1.2.7
131022  8:17:56 InnoDB: Using Linux native AIO
131022  8:17:56 InnoDB: Initializing buffer pool, size = 128.0M
131022  8:17:56 InnoDB: Completed initialization of buffer pool
131022  8:17:56 InnoDB: highest supported file format is Barracuda.
131022  8:17:56  InnoDB: Waiting for the background threads to start
131022  8:17:57 InnoDB: 5.5.31 started; log sequence number 1678395
131022  8:17:57 [ERROR] /usr/sbin/mysqld: unknown variable 'master-host='
131022  8:17:57 [ERROR] Aborting

Thing is the replication entries in my.cnf need to be removed/commented out and salve needs to be set up from MySQL console.

So here is my new my.cnf.

[11:34:25] xavi@linode1: ~ $ sudo grep -v “^#” /etc/mysql/my.cnf | grep -v “^$”

port            = 3306
socket          = /var/run/mysqld/mysqld.sock
socket          = /var/run/mysqld/mysqld.sock
nice            = 0
server-id       = 2
user            = mysql
pid-file        = /var/run/mysqld/mysqld.pid
socket          = /var/run/mysqld/mysqld.sock
port            = 3306
basedir         = /usr
datadir         = /var/lib/mysql
tmpdir          = /tmp
language        = /usr/share/mysql/english
bind-address            =
key_buffer              = 16M
max_allowed_packet      = 16M
thread_stack            = 128K
thread_cache_size       = 8
myisam-recover          = BACKUP
query_cache_limit       = 1M
query_cache_size        = 16M
expire_logs_days        = 10
max_binlog_size         = 100M
max_allowed_packet      = 16M
key_buffer              = 16M
!includedir /etc/mysql/conf.d/

[11:34:37] xavi@linode1: ~ $

We load the above file or similar depending on your configuration. Now to configure slave we log into the MySQL CLI.

mysql> STOP SLAVE;
mysql> CHANGE MASTER TO MASTER_HOST=’′, MASTER_USER=’replication-user’, MASTER_PASSWORD=’password’, MASTER_LOG_FILE=’mysql-bin.000747′, MASTER_LOG_POS=75797;

That’s it.

DNS records creator

Back around here. Quick post of a small script to create A and PTR dns records.

Input file. First column is the IP and second column is the fqdn. We call this file hosts.txt athletic.abc.com deportivo.abc.com drac1.abc.com

Script below:


while read line; do
        IP=`echo $line | awk '{print $1}'`
        HOST=`echo $line | awk '{print $2}'`
        PTR=`echo "${IP}" | awk -F\. '{print $4"."$3"."$2"."$1".in-addr.arpa."}'`
        echo "${HOST}. IN A ${IP}"
        echo "${PTR} IN PTR ${HOST}."
done < hosts.txt


me@server:/tmp$ bash dnsconverter.sh
athletic.abc.com. IN A IN PTR athletic.abc.com.
deportivo.abc.com. IN A IN PTR deportivo.abc.com.
drac1.abc.com. IN A IN PTR drac1.abc.com.