regarding www.yahoo.com (akamai) TTL values
Vishwas
ivishwas at gmail.com
Wed Apr 25 10:35:46 UTC 2007
Hi All,
My understanding is that TTL values for all entries specified in a
zone are equal to the TTL value specified in the SOA section of that
zone.
Following is the scenario that is confusing me.
STEP-1 [get current TTL from local DNS, and find authority for www.yahoo.com]
$ dig www.yahoo.com
...
;; ANSWER SECTION:
www.yahoo.com. 139 IN CNAME www.yahoo-ht3.akadns.net.
www.yahoo-ht3.akadns.net. 60 IN A 209.131.36.158
;; AUTHORITY SECTION:
akadns.net. 17543 IN NS za.akadns.org.
...
STEP-2 [ask the authority about an entry in its zone and observe the
TTL value returned]
$ dig @za.akadns.org www.yahoo-ht3.akadns.net
...
;; ANSWER SECTION:
www.yahoo-ht3.akadns.net. 60 IN A 209.131.36.158
...
STEP-3 [check the SOA setting of the authority]
$ nslookup
> set type=soa
> akadns.net
Server: 192.122.134.35
Address: 192.122.134.35#53
Non-authoritative answer:
akadns.net
origin = internal.akamai.com
mail addr = hostmaster.akamai.com
serial = 1177489512
refresh = 19200
retry = 19200
expire = 19200
minimum = 180
Authoritative answers can be found from:
akadns.net nameserver = za.akadns.org.
...
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