Chrooted blog

Ubuntu 12.04 Precise Pangolin and IPv6 privacy addresses

The newly released Ubuntu LTS includes a very poor default configuration concerning IPv6 and privacy addresses. This feature is enabled by default, hardcoded (as it seems) in the last release of NetworkManager.

While this choice is understandable, it can't be changed and this is unfortunate: almost no one really needs this feature and it breaks AAAA/PTR DNS mappings in well-managed networks.

How to circumvent this cleanly?

IPv6: Test your connectivity on a remote computer via your browser.

While test-ipv6.com and ipv6-test.com are great sites for testing IPv6 connectivity on your personal computer, they rely heavily on javascript code in their tests and therefore cannot be used with w3m.

How to disable random IPv6 addresses on Windows Seven / Vista (no Privacy Extensions anymore!)

There is a lot of information about this "issue" on the web, but the following method is the only one actually effective in my case. This is very useful for setting up DNS AAAA and PTR records for IPv6 auto-configured hosts.

Enabling SNMP on SLM2008 Cisco Small Business Switch

Cisco SLM 2008 is a very efficient layer 2 manageable gigabit ethernet switch, with decent pricing and a large range of features: VLAN, (R)STP, LACP and static link aggregation, 802.1X Authentication, IGMP Snooping, you name it. Even the integrated web interface is quite well designed and not buggy.

But one (native) feature is lacking when you want to monitor per-port network traffic : SNMP.

Here is how to enable and basically configure SNMP on SLM2008 switches.

DNS recursive attacks, DoS and DDoS : iptables -m recent is your friend

Got plenty of query (cache) 'isc.org/ANY/IN' denied in your bind9 logs? Like about 1 query per second from several IPs? Want to tell them to get lost? This entry may interest you then.

Lenovo Thinkpad X300 , battery management and tp_smapi

This article briefly presents a "solution" to the battery switching issue mentioned at the bottom of this blog entry.

Lenovo Thinkpad X300 and Linux - Configuration and power management

I recently replaced my Macbook with a Lenovo Thinkpad X300 notebook. Here are some notes and tips concerning GNU/Linux installation and configuration for an optimal day to day use.