I noticed that dig google.com
produces four distinct IP addresses. What does that mean? It could be
- use any, doesn't matter
- try the first, if it doesn't respond, try the next (and so forth)
- or ...?
Or is this just supposed to be round-robin? (If so, why would it return 4 values, instead of just 1?)
I'm sort of hoping it means that browsers would try all four in sequence until they got one that works.
Here's what I'm getting: dig google.com
:
;; QUESTION SECTION:`
;google.com. IN A
;; ANSWER SECTION:
google.com. 293 IN A 74.125.19.99
google.com. 293 IN A 74.125.19.103
google.com. 293 IN A 74.125.19.104
google.com. 293 IN A 74.125.19.147
;; AUTHORITY SECTION:
google.com. 81797 IN NS ns2.google.com.
google.com. 81797 IN NS ns4.google.com.
google.com. 81797 IN NS ns1.google.com.
google.com. 81797 IN NS ns3.google.com.
;; ADDITIONAL SECTION:
ns1.google.com. 255049 IN A 216.239.32.10
ns2.google.com. 230304 IN A 216.239.34.10
ns3.google.com. 231860 IN A 216.239.36.10
ns4.google.com. 58735 IN A 216.239.38.10`