Linksys SPA942 phones reboot on DHCP lease renewal even if the lease information does not change (apart from the obvious timestamps). Increased lease time to 1 week for all phones.

Staying connected on the train

Written early in the evening in English • Tags: , , ,

VR-junaverkko blocks most outgoing ports, which is a repeating source of annoyance when traveling. I would think that a traffic shaping approach would be more effective, but maybe I don’t have a sufficient understanding of their bandwith limitations. (more…)

VMware ESXi won’t do jumbo frames on my Intel card (e1000 driver). Splitting the home network into two subnets with different MTU sizes is also less than ideal as mDNS (Mac, Apple TV) and Squeezebox server advertisements would need a proxy of some sort.
I hadn’t noticed that NBAR in Cisco IOS has support for Skype. This should make QoS for Skype just as easy as for SIP on my network. Results pending…

Disabling 6to4 and Teredo

Written in the mid-afternoon in English • Tags: , ,

Windows tries to use 6to4 and Teredo automatically, not always resulting in a good IPv6 experience. To disable both, execute these commands:

netsh interface ipv6 6to4 set state disabled
netsh interface teredo set state disabled

On Windows XP teredo isn’t a context inside interface, but rather a setting in ipv6:

netsh interface ipv6 set teredo disabled

Sources and more information:

Adam asked me about an old document I had written about preventing a Windows NT machine from causing an ISDN router to dialup unnecessarily. I think I had junked the document as too old, but maybe it still is a useful reference. So I have restored it from the Internet Archive’s Wayback Machine.

The bridge kludge

Written late in the afternoon in English • Tags: , ,

I ran into a model symptom of lacking multicast support with IPv6: a system wouldn’t answer to IPv6 traffic it didn’t initiate. But unless you’ve run into the problem before and managed to diagnose it successfully, you might not realize it’s about multicast.

It was my second Debian Linux system with IPv6 connectivity that gave me a start. I built one more system and got the same results. I could have sworn the first one had worked fine without any tricks. I considered it, but decided I’d rather not abandon IPv6 on Linux. After all, I had it running on all the other platforms (NetBSD, Mac OS X, Windows). (more…)