On Fri, 23 Mar 2018 14:51:30 -0500, Nicky Perian wrote: > What is the procedure for determining which CDN node is use for viewer > instance.
CDN server IPs are served by your DNS, the latter being updated with the closest CDN server. I.e. if you live in one country and use a DNS hosted in another, you get the IP of the CDN server of that other country instead of yours... The assumption is that people are likely to use a DNS close to their home (usually, they use their ISP's DNS). E.g. for me (in France) with my ISP's DNS: # nslookup maps-cdn.agni.lindenlab.com maps-cdn.agni.lindenlab.com canonical name = secondlife.edgesuite.net. secondlife.edgesuite.net canonical name = a336.d.akamai.net. Name: a336.d.akamai.net Address: 88.221.83.50 .../... # whois 88.221.83.50 inetnum: 88.221.83.0 - 88.221.83.255 netname: AKAMAI-PA descr: Akamai Technologies country: EU (actually, 88.221.83.0/8 is in France) .../... Now, via dnscrypt (with a DNS in Canada): # nslookup maps-cdn.agni.lindenlab.com maps-cdn.agni.lindenlab.com canonical name = secondlife.edgesuite.net. secondlife.edgesuite.net canonical name = a336.d.akamai.net. Name: a336.d.akamai.net Address: 23.15.4.17 .../... # whois 23.15.4.17 NetRange: 23.0.0.0 - 23.15.255.255 CIDR: 23.0.0.0/12 NetName: AKAMAI .../... Country: US > Then, how do you determine which assets are present on that CDN and not > present in the viewer? Not sure what you mean, here... The viewer requests an asset to the CDN server and if the asset is already cached in the latter, it is immediately transfered to the viewer, else the CDN server asks to the upstream server for that asset, caches it and transfers it to the viewer. Henri. _______________________________________________ Policies and (un)subscribe information available here: http://wiki.secondlife.com/wiki/OpenSource-Dev Please read the policies before posting to keep unmoderated posting privileges
