In a busy network environment, it is critical to have some form of network monitoring on all your servers and equipment. Network monitoring comes in many different forms and flavors, whether it be to monitor critical system services and applications via SNMP, WMI, or some proprietary third party software, or just generically pinging some devices to make sure they are up.
Nowadays, it is getting more and more necessary to dig deeper to be able to track what end users are doing and what websites they are visiting and this is where the Cisco Netflow comes in handy. Essentially, netflow allows us to peer down into the network traffic streams and give us vital source, destination, and protocol information coming to and from our network hosts but isn’t quite as storage intensive as doing a full fledged pcap dump, which makes historical accounting of this data a whole lot nicer.
Continue reading “Bash Script – Move Files into Subdirectories Based on Modified Date – OR – Moving Ntop Netflow Dumps into Subdirectories by Date”
These are just a few quick notes of mine on how to host a PRI circuit from a Sangoma card in an Asterisk server to another Asterisk server or wherever for that matter.
This config here is for a Sangoma A102 with two ports and Asterisk will provide the clocking source. Channels 1-23 will be the B channels and channel 24 will be the D channel for signaling. Echo cancelling will be enabled as well.
#autogenerated by /usr/sbin/wancfg_dahdi do not hand edit
#autogenrated on 2015-08-28
#Dahdi Channels Configurations
#For detailed Dahdi options, view /etc/dahdi/system.conf.bak
#Sangoma A102 port 1 [slot:4 bus:6 span:1]
#Sangoma A102 port 2 [slot:4 bus:6 span:2]
Continue reading “Asterisk – How to Host a PRI Circuit with a Sangoma Card”
Here’s an extremely basic, reusable PHP and MySQL based PDO class for easily connecting to multiple database servers simultaneously within a script without having to go through a bunch of hoopla. Tidbits have been pieced together from the following sources with a little tweaking of my own (such as the ability to have default database values or to pass them as arguments):
Continue reading “PHP – Simple PDO Class for Connecting to a MySQL Database”
In Ubuntu, the best way to ensure that the firewall is up and running and that your packet filtering or mangling rules are in place any time the network connection comes up, you should create a rule in the /etc/network/if-up.d folder. An alternative approach to that would be to put a “post-up” rule on whatever interface in you /etc/network/interfaces file. From my experience, so that your firewall rules can be easily maintained as well having the ability to make comments for each rule, it’s ideal to take advantage of the iptables-save and iptables-restore functionality.
In order to follow this procedure, the first time you set up the firewall, you will have to manually add all the firewall rules and then issue the iptables-save command. For sake of saving time, I will just provide you with the contents of my config file that can be restored with the iptables-restore < config_file command. Continue reading “OpenMCU-ru – DSCP Based QoS Packet Tagging Rules for Linux IP Tables”
Here is a simple example of how to use VBScript to access environment variables, use the variables to obtain a user’s SID, and then print them to the screen. Continue reading “VBScript – How to Access Environment Variables -OR- How to Get the Username, Domain, or a User’s SID”
Pieced together from various tutorials on the web with a lot of my own additions, here is a snippet of SQL that will alter or convert all tables in a database from “MyISAM” to “InnoDB”. As long as your MySQL user account has privileges to create stored procedures, all you have to do is simply edit the @DATABASE_NAME variable at the top of the script and run it in PhpMyAdmin if you’ve got it. Enjoy! Continue reading “MySQL Script – Alter/Convert All Tables in a Database from MyISAM to InnoDB”
Here is a quick and dirty bash script I threw together today to log the concurrent calls for each of my long distance trunks in Asterisk to a MySQL database to be able to quickly analyze usage trends. Sure there is probably other open-source software out there that can do this and give pretty little graphs and what not (cdr-stats or maybe queue metrics come to mind), but where’s the fun in that? As I mentioned, the script is extremely primitive (just the bare minimum as I didn’t have much time to spend on it) and contains no error checking whatsoever but it could also be used as a pretty handy one-liner in bash.
Show all active SIP Calls on a single trunk
asterisk -x "core show channels verbose" | grep "^SIP/yourSIPTrunkName-"
Show concurrent number of SIP Calls on a single trunk
asterisk -x "core show channels verbose" | grep -c "^SIP/yourSIPTrunkName-"
Show all active DAHDI calls on channels 1-24
Continue reading “Bash Script – Log Concurrent Asterisk Calls to MySQL and Other Useful One-Liners”
For the longest time, I was having trouble getting the log rotate daemon to work properly with Asterisk. I tried using both postrotate and prerotate options on Ubuntu Server and no matter what, I always ended up with dozens or even hundreds of files if I wasn’t keeping a close eye on them. I never figured out why or wanted to spend a ton of time searching for answers but for some reason, the numbering on the log files would always get messed up and it would start adding extra periods on the end of the filenames and everything would get all out of whack.
Continue reading “Bash Script – An Alternative to Logrotate.d for Asterisk Log Files”
In the config file for the pcapsipdump program, there is a retention option where you are supposed to be able to enter the number of days to keep the directories in your spool folder and it should auto purge out the old directories/files, however, this option either doesn’t appear to be implemented yet or doesn’t work if you run the app as a different user (could be a permissions issue maybe?).
Anyhow, this script is my solution to the problem. It could also very easily be modified and used where someone needs to search and delete directories that are based on YYYYMMDD format with the ability to whitelist or ignore certain directories, hence the alternate title. Yet another alternate title could even be “Bash Script Functions – Convert YYYYMMDD to Unix Time and Vice Versa” but obviously the script would need modified a little because it has been tailored to fit my needs.
When run as a cron job, the script will grab both the spool directory and the retention period from the pcapsipdump config file and will purge out any old folders based on YYYYMMDD format so they aren’t eating up all your valuable disk space.
I also added a couple of noteworthy user-configurable options. The first being a directory whitelist feature (IGNORE_DIRS array), this option can be used in situations where there are directories that you don’t want purged or would like to keep the data indefinitely and that can also be used in conjunction with the PURGE_ALL feature to delete out any subdirectories that aren’t specifically listed in the whitelist if you are a clean freak.
Download it now – pcaprotate.sh
# pcapsipdump file rotation
# By Nathan Thomas
### VARS ###
# Location of the pcapsipdump config file
# Keep the spool folder clean - Delete all folders (except those in the ignored directories array)
# yes - Keep the spool folder free from any directories not in the ignore list
# no - Don't worry about any other random folders in the spool directory
Continue reading "Bash Script – Pcapsipdump Spool Directory File Rotation – OR – Rotate Directories Based on YYYYMMDD Format"
This is just a table of contents of the various Asterisk dialplan modules I have created over the last couple of years and am releasing to the general public as open-source in hopes that somebody finds them as useful as I do.
In my days as a Network Administrator managing six interconnected, fully-meshed branch office PBX’s at a telemarketing firm, maintaining six separate dialplans became a tiresome effort which ultimately led to my creation of the dialplan modules.
Continue reading “Asterisk – Modular Dialplan”