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Comment by cyberax

2 years ago

My personal example: VoIP phones stopping after the Asterisk server was up for 3 days.

Reason: the server had IPv6 turned on, and it steadily accumulated privacy IPv6 addresses. These addresses were all sent in a packet describing the supported media endpoints, using UDP.

And yep, eventually it overflowed the MTU and the phones couldn't handle the fragment reassembly.

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cyberax

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gerdesj  2 years ago

Which distro was that? ... asking for a friend ...

  • cyberax  2 years ago

    Just regular Ubuntu. It was around 2009 or so.

    • gerdesj  2 years ago

      Thanks. I've never run Asterisk on Ubuntu. FreePBX is CentOS based which is mostly what I've run Asterisk on. I only started to worry about Ubuntu around 2012.

      That mad IPv6 address thing must have stuffed up more than just a VoIP negotiation packet. DNS switches from UDP to TCP when responses get too large.

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