Matthias Fechner:
Am 02.01.2017 um 16:41 schrieb A. Schulze:
One may publish records like "v=spf1 a -all" for a host mail.example.org
mail.example.org. A 192.0.2.25
mail.example.org. AAAA 2001:db8::6:25
mail.example.org. TXT "v=spf1 a -all"
This require two or three dns lookups. (1x TXT, 1x A and 1x AAAA
depending on the spf implementation)
but this is asked only every refresh time defined in the SOA of the
domain or?
So if in the zone is 12 hours for refresh defined it will do 3 requests
only once per 12 hours.
The rest should be cached by the DNS server?
yes, once fetched the entries should be cached for a longer time as usual.
Andreas
