On 2 May 2013 11:12, Patrick W. Gilmore <patr...@ianai.net> wrote: > On May 02, 2013, at 12:12 , Joe Abley <jab...@hopcount.ca> wrote: >> On 2013-05-02, at 12:10, Joe Abley <jab...@hopcount.ca> wrote: >>> On 2013-05-02, at 11:59, Charles Gucker <cguc...@onesc.net> wrote: > >>>> That's not entirely true. You can easily do lookup for >>>> whoami.akamai.net and it will return the unicast address for the node >>>> in question (provided the local resolver is able to do the >>>> resolution). This is a frequent lookup that I do when I don't know >>>> what actual anycast node I'm using. >>> >>> Using 8.8.8.8 to tell me about whoami.akamai.net tells me what Akamai >>> authoritative server Google last used to answer that query. >> >> Oh, now that I poke at it, it seems like whoami.akamai.net is telling me >> about the address of the resolver I used, rather than the address of the >> akamai node I hit. >> >> Never mind, I understand now :-) > > For clarity: Looking up the hostname "whoami.akamai.net" will return the IP > address in the source field of the packet (DNS query) which reached the > authoritative name server for Akamai.net. > > We use this to look for forwarding or proxying, which is frequently unknown / > invisible to the end user. > > It has the side-effect that querying against an anycast server (e.g. > 208.67.222.222 or 8.8.8.8) will show the unicast address of the anycast node > which forwarded to our servers. > > In case anyone is wondering, we do not do any special logging or watching of > this hostname. It is logged for a short time on the local hard drive the same > as any other DNS query, but unless someone actually looks, we will not notice > if you query for it. So feel free to use it for your own purposes as much as > you like. We have a bit of spare DNS capacity. :)
No IPv6 at akamai.net, huh? :p Cns# host whoami.akamai.net whoami.akamai.net has address 216.66.80.30 Cns# host 216.66.80.30 30.80.66.216.in-addr.arpa domain name pointer tserv1.fra1.he.net. Cns# Does anyone run a DNS whoami that's IPv6-ready? C.
