Recent posts (paged)
Openbox Config File
I don't use desktop environments on Linux. I prefer small,fast, efficient window managers. Some years ago I used olvwm (open look window manager) which was dicontinued by sun. Then I switched to wmx which I patched for my needs, but still it was missing some features. Now I use openbox which is highly configureable ...
Copy'n'Paste from Xterm to Chrome
Problem: X11 has a classical copy/paste mechanism which is: select text - press middle mouse button in the target field. And there is a second copy/paste which was adopted from Mac and Windows which is: select text - Ctrl-C - click into tagert field - Ctrl-V. I prefer the classical approch, but in some web applicati...
Cisco ASR 1002-X and PPTP
Problem: PPTP from any client to an ASR1002-X Cisco does not work. PPTP Connections starts but in PPP LCP phase the connection fails. Solution: Cisco ASR1002-X with Software IOS-XE 15.3(2)S2 has no PPTP support. You have to take a different Router! Discussion: The weird thing is, that most of the PPTP stack is still...
Ping to Windows Server 2012 with Direct Access fails
Problem: Ping from Linux computers to Windows Server 2012 with Direct Access fails for hours (no response) although connectivity is working (eg. HTTPS) Discussion: Ping from other windows machines and Cisco machines worked, but from Linux machines ping was not answered. I tried to find the difference between those I...
Hide Mouse Coursor on X11/Xorg
Problem: for some applications a mouse coursor in disturbing. E.g. video players, signage display. Solution: the tool unclutter hides the mouse coursor after a chosen idle timeout. Unclutter is part of the main debian repository. Version: Debian 7.1
Clamav/Freshclam update fails!
Problem: I got the following error message in the the freshclam.log file on several servers with clamav installed. ERROR: getpatch: Can't download daily-16682.cdiff from database.clamav.net Due to this bug the virus database wasn't updated for days! It seams to be a bug in clamav with dialy-16682.cdiff (dialy.cvd in...
Linux on HP servers
Problem: You want to check the hardware health status on you debian server running on an HP ProLiant hardware. After spending some time on the HP.com homepage, I got really angry. HP does a really bad job on their support homepage. If you search for DL360 G5 you see a list of operating systems. The list of Debian OS...
CDP / LLDP Fun
Problem: You want to know which switch and what port your Linux machine is connected to? Solution: If the switch does CDP (all Cisco switches do), it tells you a lot of information. Tcpdump can capture and show this information. # tcpdump -i eth0 -n -v -s 1500 -c 1 'ether[20:2] == 8192' tcpdump: listening on eth0, l...
AVM Fritz!box DHCP Problem
Problem: I wanted to provide a CWMP (TR-069) ACS URL to an AVM modem using DHCP on the WAN Interface, but the DHCP server ignores this vendor-option. Discussion: Following the TR-069 specs, the CWMP-ACS Server can be included in an dhcp response using vendor-option (SubOption 1). Usually vendor options should work w...
IPv6 Only Test
The IPv6 designers refused to define an IPv4/IPv6 gateway, because it's a contradiction to the NO-NAT, End2End paradigm of IPv6. The result is that IPv6 doesn't really lift off, because every IPv6 user has IPv4 too (Dual Stack), which gives no pressure to move on to implement IPv6. Large providers had to implement N...