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In computer networks, a reverse DNS lookup or reverse DNS resolution (rDNS) is the querying technique of the Domain Name System (DNS) to determine the domain name associated with an IP address – the reverse of the usual "forward" DNS lookup of an IP address from a domain name. [1]
Forward-confirmed reverse DNS (FCrDNS), also known as full-circle reverse DNS, double-reverse DNS, or iprev, is a networking parameter configuration in which a given IP address has both forward (name-to-address) and reverse (address-to-name) Domain Name System (DNS) entries that match each other. This is the standard configuration expected by ...
With djbdns, in addition to checking for wildcards at the current level, the server checks for wildcards in all enclosing superdomains, all of the way up to the root. [citation needed] In the examples listed above, the query for _telnet._tcp.host1.example for an MX record would match a wildcard despite the domain _tcp.host1.example existing.
Forward checking only checks whether each of the unassigned variables x 3 and x 4 is consistent with the partial assignment, removing the value 2 from their domains. The simpler technique for evaluating the effect of a specific assignment to a variable is called forward checking . [ 1 ]
If the domain name has an MX record resolving to the sender's address, it will match (i.e. the mail comes from one of the domain's incoming mail servers). PTR: If the domain name for the client's address is in the given domain and that domain name resolves to the client's address (forward-confirmed reverse DNS), match. This mechanism is ...
Default Forwarding (DF) PHB — which is typically best-effort traffic; Expedited Forwarding (EF) PHB — dedicated to low-loss, low-latency traffic; Assured Forwarding (AF) PHB — gives assurance of delivery under prescribed conditions; Class Selector PHBs — which maintain backward compatibility with the IP precedence field.
Email forwarding generically refers to the operation of re-sending a previously delivered email to an email address to one or more different email addresses.. The term forwarding, used for mail since long before electronic communications, has no specific technical meaning, [1] but it implies that the email has been moved "forward" to a new destination.
Reverse-path forwarding, a technique used in routers for ensuring loop-free forwarding of packets in multicast routing and to help prevent IP address spoofing in unicast routing; URL redirection, also called URL forwarding, domain redirection and domain forwarding, a technique that forwards web page visitors to another page
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