Monthly Archives: August 2011

Cisco has weird naming conventions for groups of interfaces

If you want to bind some ethernet interfaces into one logical interface between two ciscos switches you have to configure an interface first: interface Port-channel 1 then add some interfaces into this new interface: interface GigabitEthernet 1/0/1         channel-group 1 … Continue reading

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BGP Looking Glass

If you like to search through the full Internet routing table from around the world, you can find some looking glasses at http://www.traceroute.org/ or http://www.routeviews.org/. e.g. Routeviews has telnet access to zebra servers (route-views.isc.routeviews.org,…)

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L2TP tunnel between two cisco routers

Problem: a Cisco 1941 [15.1(2)T2] (Client) tries to connect to an Cisco7300 [12.3(22)] (Server) using L2TP, but after successful authentication of the client the server drops the connection. Solution: The client tried to authenticate the server, but the server had … Continue reading

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Using an HP scanner on the command line

I don’t use Gnome, KDE, etc. My window manager is WMX with some patches. Without all those fancy window environments, you get rid of all magic auto configurations, and wizards at the same time, and you can configure your system … Continue reading

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Restore data from a single disk of an HP/Compaq SmartArray raid1

If you look into a harddisk from an HP server with smart array configured for raid1, you will recognize that the partition table of this disk has only one partition: Device Boot      Start         End      Blocks   Id  System <device>p3               1           1        … Continue reading

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Mysqldump: out of memory

A small mysqldump hint: You can use mysqldump –skip-opt to get proper insert statements in the SQL dump. But –skip-opt disables –quick which means mysqldump buffers full tables before writing -> Out of memory. In this case I use: mysqldump … Continue reading

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Cisco Access Point blocking PPTP

Vienna: 10. August 2011 Problem: A network of some Cisco Access Points AIR-AP1142N-E-K9 connected to an small router works good as expected but when the user tries to connect to en PPTP VPN the connection fails with a time-out. Solution: … Continue reading

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Hello world

My daily job is solving IT problems. No matter if they are hardware/software, or os/configuration/application related. There is always a bug to be fixed. And: AlexT Debugs This blog will be the place to remember some solutions to problems, because … Continue reading

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