Traffic engineering and peering for CDNs

[mark.tinka at seacom.mu (Mark Tinka)]

On 6/Jun/16 20:03, Tom Smyth wrote:

> as far as im aware ... a friend of mine on INEX in Ireland said most cdns
> use source ip of the DNS requests to determine which network to direct them
> to ... so if you use you have your own resolver on  an ip address  in your
> network range cdns can accurately determine what network the request is
> comming from and determine what  ip address / what network that the cdn has
> nearest to your network...
>
> ff you use 3rd party  dns servers for your clients... you may not get an
> optimal ip answer for your dns queries from the CDNS involved

Some CDN's use DNS (in addition to latency, congestion levels, busy
state, e.t.c.).

Others use Anycast routing, which I tend to prefer. The problem is the
latter run a network while the former may typically not.

Mark.