Linux, programming and more
Before I changed to OpenVPN I used racoon IPSEC tool. It was very unstable for my setup, because one VPN site has a dynamical IP-Address and only with dirty workarounds was it possible to use it.
After some unsuccessful tries with openswan:( I decided to try OpenVPN and I had luck I found very useful blog of (Sébastien Wains) which was my clue to my working VPN.
I draw a little map of my VPN setup:
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There are many configuration options with inpact on performance in Roundcube and behind it (Database and Webserver). As Roundcube installation administrator you can set them to some defaults and prevent users to change them by using the ‘dont_override‘ option.
I tested some options and created my tiny boost list.
Here’s the list of options with impact on performance
Messages listing is a main task of a mail client. Sorting is expensive. First of all you should use an IMAP server with SORT capability. If message list displaying is still too slow you should set ‘message_sort_col’ to an empty string.
‘message_sort_col’
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Sometimes it’s interesting to test some MTA’s and their spam behavior, every mail system has his own spam behavior like SPAM_MARK_LEVEL or SPAM_REJECT_LEVEL.
If you send a mail with GTUBE string your mail should be rejected.
1 | rejected after DATA: This message scored 1000.0 spam points |
The GTUBE String to test spam rejection of mail servers:
1 | XJS*C4JDBQADN1.NSBN3*2IDNEN*GTUBE-STANDARD-ANTI-UBE-TEST-EMAIL*C.34X |
Why I do it?
Cause my Nagios3 is running as a virtual machine on a Xen Server, and I have less than 64MB of RAM.
First I install lighttpd, to prevent automatically apache2 installation during the nagios3 installation:
1 | apt-get install lighttpd |
Install a simple tftp Server under Debian 5 codename Lenny:
1 | aptitude install atftpd |
Should the server be started by inetd?
On the question answer with NO, it should run as a daemon and not as inetd service:
Choose a base directory for your data.
Test tftp-server:
1 | tftp 192.168.10.2 |