DNS , , , . IP-, .
DNS . IP- , , . UDP- DNS-, IP- , , , . IP-, TCP- UDP-.
, 200 . , . , , , , . .
DNS . , primary, , master. - , secondary, slave. DNS . . SOA . , , " " ("zone transfer")- .. . TCP, 53, , UDP/53.
DNS . . , - , . DNS , .
; . - "" ("master").
, , ( ) . com. , com.
|
|
, , , : . - , , DNS, , .
3 DNS:
master (primary). , . ;
slave (secondary). , master . ;
hint (caching). , , ., .. . .
, , . . hint, DNS. .
DNS , . ($ORIGN, $TTL) .
: 1 2 . . .
/etc/resolver.conf . DNS, resolver.conf. . , . . .