Unfortunately my server died on me last weekend, so I had to spend the weekend on migrating everything to another host….
Everything should be running smoothly now, as I am no longer in charge of the server and have no ways of screwing it up 
Archive for the ‘Linux’ Category
Again some server downtime
Monday, August 3rd, 2009Strange e-mail originating from exchange server
Monday, June 8th, 2009Today a friend asked me to look at something strange he found in his logs.
To better understand the situation, I’ll describe his network setup:
He runs a linux server with postfix, spamassassin and clamav antivirus which removes all spam and virusses received from the internet. All legitimate e-mail is then routed to his exchange server. E-mail that is sent by users on his network is relayed back to the linux server and then sent to the destination.
Last week he was checking his mail logs on his linux machine and he noticed his box was receiving e-mail from strange e-mail addresses. He figured: Well, no surprise there: Probably spam messages. Until he looked at the ip address from which it originated: It was the ip address of his own exchange server. First thing he did was doing a full virusscan of his exchange server. Nothing. He tried some spyware scanners, but again: Nothing. So he called me.
Configuration leak found
Wednesday, January 30th, 2008A few months ago a third party installed a server in our network. Because we, the IT departement, was not actively involved in this I decided to screen the systems myself. Afterall our department had full responsibility for these systems, even though we did not know anything about them.
Asterisk, SIP, Openwrt and Cisco 7912 IP phone
Monday, July 23rd, 2007After finishing my previous post I decided to also write a small how-to about configuring Asterisk and flashing the cisco 7912G with the SIP firmware.
Ingredients for today are:
| A cisco 7912G IP phone | [Get it here] or [here] |
| SIP firmware for the 7912G phone | [Get it here] or [here] |
| Asterisk package for OpenWrt | ipkg install asterisk |
| Asterisk voicemail package for OpenWRT | ipkg install asterisk-voicemail |
| Asterisk sounds package for OpenWRT | ipkg install asterisk-sounds |
| A small amount of time |
OpenWRT + tftp server
Wednesday, July 18th, 2007I had purchased a while ago a Asus WL500g Deluxe and decided to flash the thing with OpenWRT.
At first, I only wanted to let the thing bridge with a wireless access point (WDS) but when I noticed I could enhance the functionality of the router with asterisk I flashed the device and installed asterisk. Piece of cake!
So I had some experience with Cisco IP phones ( Cisco 7912G ) and flashing it with SIP software, so I looked for one on the internet and found and bought one on a internet auction for 50 euros. To flash it, I had to install a TFTP server ( well, to dynamically configure it I had to install it ) so I hoped to install it on OpenWRT to.