6.033 Lecture 14 DNS and Content Delivery Networks Sam Madden Key ideas: Domain name service Content delivery networks Network overlays.

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Presentation transcript:

6.033 Lecture 14 DNS and Content Delivery Networks Sam Madden Key ideas: Domain name service Content delivery networks Network overlays

The “dig” Command ;; QUESTION SECTION: ;csail.mit.edu.INA ;; ANSWER SECTION: csail.mit.edu.5921INA ;; AUTHORITY SECTION: csail.mit.edu.15152INNSAUTH-NS0.csail.mit.edu. csail.mit.edu.15152INNSAUTH-NS1.csail.mit.edu. csail.mit.edu.15152INNSAUTH-NS2.csail.mit.edu. csail.mit.edu.15152INNSAUTH-NS3.csail.mit.edu. The question we askedThe answer Servers that can answer the question dig csail.mit.edu“Time to Live” (TTL) Type of record A = “Address” NS = “Name server”

This video has been downloaded 30 million times

graphics8.nytimes.com from T-Mobile Cell Phone -bash ~ % dig graphics8.nytimes.com ; > DiG P2 > graphics8.nytimes.com ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: ;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;graphics8.nytimes.com.INA ;; ANSWER SECTION: graphics8.nytimes.com.281INCNAMEgraphics478.nytimes.com.edgesuite.net. graphics478.nytimes.com.edgesuite.net INCNAME a1116.x.akamai.net. a1116.x.akamai.net.5INA a1116.x.akamai.net.5INA

graphics8.nytimes.com from T-Mobile Cell Phone -bash ~ % traceroute traceroute to ( ), 64 hops max, 40 byte packets in-addr.arpa ( ) ms * * 2 * * in-addr.arpa ( ) ms in-addr.arpa ( ) ms ms ms in-addr.arpa ( ) ms ms ms 5 m8e065e42.tmodns.net ( ) ms ms ms in-addr.arpa ( ) ms ms ms in-addr.arpa ( ) ms ms ms 8 * * * 9 ge-6-20.car1.Atlanta1.Level3.net ( ) ms ms ms 10 ae car1.Atlanta4.Level3.net ( ) ms ms ms ( ) ms ms ms

dig google.com ANSWER SECTION: google.com.282INA google.com. 282INA google.com.282INA