Was macht eine Reverse Lookup Zone?
Das Konfigurieren einer Reverse-Lookup-Zone im Domain Name System (DNS) ist ein Standardverfahren für die Konfiguration von Microsoft Active Directory. Fehlt eine Reverse-Lookup-Zone, kann es Browsern immer noch möglich sein, den Server zu kontaktieren.
Wie funktioniert Reverse DNS?
Als Reverse DNS (rDNS) bzw. Reverse DNS Lookup bezeichnet man eine DNS-Anfrage, mit deren Hilfe sich die IP-Adresse zu einem bestimmten Domainnamen bzw. Hostnamen ermitteln lässt.
What’s the difference between a record and a PTR?
While A record maps the domain name to an IP address, the PTR record maps the IP address to a hostname. So, the PTR record ensures that your IP address officially connects to your host. Configuring the PTR record is essential if you’re using both internal or external mail servers.
What does it mean to declare PTR as a pointer?
If *ptr points to a variable, then that would mean that *ptr is a pointer itself. That would mean you’re declaring ptr as follows: int **ptr; If ptr points to a variable instead of *ptr (ie int *ptr; ptr = &x ), there is one less level of indirection than my above example. ptr is the identifier/name. You declare it by int *ptr.
Which is the opposite of a DNS PTR record?
A DNS pointer record (PTR for short) provides the domain name associated with an IP address. A DNS PTR record is exactly the opposite of the ‚A‘ record, which provides the IP address associated with a domain name. DNS PTR records are used in reverse DNS lookups.
What’s the difference between an int and a PTR?
ptr will be the variable, of type int *, instead storing a 5 or „foo“, it will store an address like 0xf0f0f004 or whatever it is the address of the variable number. *ptr will be the value of what it is in this address of memory 0xf0f0f004, in this specific case is 5.