Archive for February, 2014

Google is talking IPv6 to me.

February 13, 2014 - 3:38 am

We’re getting there!
It has been a while since I started digging into IPv6. My home network is running on IPv6 for a while, but now I’m confident enough to implement it in my productive setup.

My mailserver has now been fully migrated to IPv6 and while doing this I properly implemented TLS (with a CACert signed certificate) including perfect forward secrecy (PFS) and so on.

Here is how servers of major freemail providers are reacting to my new setup.

Provider sending to… receiving from…
IPv6 TLS IPv6 TLS
GMail yes yes yes yes
GMX no yes no yes
web.de no yes no yes
T-Online no yes (no PFS) no yes
Yahoo no broken* (untested) (untested)
live.com/hotmail no no no no
Apple me.com/mac.com no no no no

* Certificate does not match hostname. They are trying to use a wildcard certificate across two levels of subdomains which is forbidden for HTTPS and not explicitely allowed for SMTP.

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Category: Networking  No Comments »

Useful rope knots (Material for Training-Of-Trainers session)

February 6, 2014 - 11:35 pm

This is the digital handout for the students which took part at my training session

Useful rope knots

This 30min session was my assignment for the Training-of-Trainers course 2014 provided by ICTI.

The knots in this short list are some of the most useful ones for the daily life.
All of them can be performed if only one end of the rope in question is loose.

Bowline
Simple knot that forms a fixed loop at the open end of a rope.
It can be used to hook the rope onto a post, hook or similar.

Backhand hitch
The open end of the rope wraps around a pole and tightens to it.
It can be used to tie a rope to a handrail or beam.

Sheet bend
Used to tie two ropes together on their open ends. It can also be used if the ropes have different diameter.

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