Archive for Sys Admin category:
Can you fill all of the Great Lakes with M&M sized /64s?
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Posted to my blog at the request of RobL !
On Nanog, Owen DeLong and Larry Sheldon were discussing the relative size of the IPv6 address space:
>> 64 bits is enough networks that if each network was an almond M&M,
>> you would be able to fill all of the great lakes with M&Ms before you
>> ran [...]
2010 will be a bad year for ipv4
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We are now at the end of January, but IPv4, the Internet’s core addressing protocol still has a nasty hangover, and all signs are pointing to 2010 being a bad year for the protocol.
Since January 1st, a few key milestones have passed, indicating how urgent the IPv4 rundown problem has become. Firms that rely on [...]
DNSSEC and SSL certificates
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Dr. Jörg Schweiger of the German domain name registry DENIC posed an interesting question at this morning’s first DENOG meeting, in Frankfurt.
Would domain name users who are concerned about the accuracy of data served pay extra for the ability to sign their DNS zone ? A handful of people in the room raised their hand [...]
innodb_data_file_path bug with long line limits
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I have a MySQL server which was starting to scrunch its data more and more slowly. Some analysis led me to blame an autoextending innodb file which had grown somewhat unkept to several GB. I wish the autoextend behaviour could be configured to grow more files rather than grow one file, but that’s another rant. [...]
Preventing Mailman annoyances
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Inspired by TheHodge’s “After you install Wordpress” article, I made a note of the things I did to configure a Mailman mailing list, after creating it. Much of this is to make the look-and-feel replicate how I used to run Majordomo lists.
Firstly, I like the Bounce handling and web-interface to Mailman, so this is why [...]
Asterisk 1.4.22 Agent call acknowledgement bug
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The behaviour of Asterisk has been altered since 1.4.21, possibly in error, with regard to answering calls from call queues.
There is a feature that requires agents to press # when they are ready to speak to a caller. Since we forward calls to agents via their mobiles, rather than auto-answer calls in a desk environment, [...]
2011 – An addressing odyssey. Preparing enterprise for IPv6.
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Yesterday I gave a talk to Sheffield GeekUp on preparing enterprises for IPv6 [download]. The premise of the talk was :
IPv4 addresses are scarse, and at current consumption rates, the IANA pool of free v4 addresses will be gone at the start of 2011.
This starts a “Post IPv4 world” where the IPv4 internet continues to [...]
Mac VNC Client for Linux KVM
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When you build a KVM guest, if you want to install the guest over the network, you should attach the video console of your guest to a VNC display.
How can I put this..? This is quite a novel way of doing it. I think there’s a reason that more virtualisation systems don’t work in this [...]
