Owen Smith wrote: > Windows by default ignores a TTL of zero and will cache the IP address > anyway. Windows DNS caching assumes that DNS to IP address mappings > hardly ever change.
I'm intrigued by all this. LMS does it's own DNS caching - if you enable network.asyncdns debug logging you can see that the TTL is mostly set to 20s for the akamai DNS lookups, and external DNS lookups are only made when that expires. Looking now, the IP address is mostly the same but does change every so often - I guess that's because things are pretty quiet now. When I looked earlier on today I was seeing frequent changes - but still with TTL around 20s, with occasional dips down to 10s. What I haven't seen is zero TTL, but I guess this might occur during very busy times. Using wireshark on a win7 PC earlier today also showed DNS lookups going out externally every 20s or so, so windows wasn't caching anything itself. I've also just tried changing to the limelight CDN - search/replace uk/sbr_high/ak/ with uk/sbr_high/llnw/ in menu.opml. The primary lookup domain as-hls-uk-live.bbcfmt.vo.llnwd.net has TTL of 169 seconds, but redirects to a different domain name for every HLS chunk with no repeats obvious - so DNS lookups for every single HLS chunk. This is a much worse situation than with the akamai streams, but those DNS lookups complete in under 1/10th of a second on my network connection by the looks of it, so there is no problem at all with the playing. ------------------------------------------------------------------------ utgg's Profile: http://forums.slimdevices.com/member.php?userid=40900 View this thread: http://forums.slimdevices.com/showthread.php?t=53229 _______________________________________________ plugins mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/plugins
