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- Forward-confirmed_reverse_DNS abstract "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 the Internet standards supporting many DNS-reliant protocols. RFC 1912 and RFC 1033 (Informational) recommend it as a best practice, but it is not a requirement of standard defining RFCs governing operation of the DNS.A FCrDNS verification can create a weak form of authentication that there is a valid relationship between the owner of a domain name and the owner of the network that has been given an IP address. While weak, this authentication is strong enough that it can be used for whitelisting purposes because spammers and phishers can not usually by-pass this verification when they use zombie computers for mail spoofing. That is, the reverse DNS might verify, but it will usually be part of another domain than the claimed domain name.Using an ISP's mail server as a relay may solve the reverse DNS problem, because the requirement is the forward and reverse lookup for the sending relay have to match, it does not have to be related to the from-field or sending domain of messages it relays.Other methods for establishing a relation between an IP address and a domain in email are the Sender Policy Framework (SPF) and the MX record. However, SPF itself relies on reverse DNS.ISPs that will not or cannot configure reverse DNS will generate problems for hosts on their networks, by virtue of being unable to support applications or protocols that require reverse DNS agree with the corresponding A record. ISPs that cannot or will not provide reverse DNS ultimately will be limiting the ability of their client base to use Internet services they provide effectively and securely.".
- Forward-confirmed_reverse_DNS wikiPageExternalLink index.php?act=findpost&pid=36027.
- Forward-confirmed_reverse_DNS wikiPageExternalLink index.php?act=findpost&pid=41615.
- Forward-confirmed_reverse_DNS wikiPageExternalLink draft-ietf-dnsop-reverse-mapping-considerations.
- Forward-confirmed_reverse_DNS wikiPageID "1609942".
- Forward-confirmed_reverse_DNS wikiPageLength "3592".
- Forward-confirmed_reverse_DNS wikiPageOutDegree "25".
- Forward-confirmed_reverse_DNS wikiPageRevisionID "680380323".
- Forward-confirmed_reverse_DNS wikiPageWikiLink Category:Computer_network_security.
- Forward-confirmed_reverse_DNS wikiPageWikiLink Category:Domain_name_system.
- Forward-confirmed_reverse_DNS wikiPageWikiLink Category:Email_authentication.
- Forward-confirmed_reverse_DNS wikiPageWikiLink Category:Internet_protocols.
- Forward-confirmed_reverse_DNS wikiPageWikiLink Category:Network_protocols.
- Forward-confirmed_reverse_DNS wikiPageWikiLink Domain_Name_System.
- Forward-confirmed_reverse_DNS wikiPageWikiLink E-mail_spam.
- Forward-confirmed_reverse_DNS wikiPageWikiLink Email_spam.
- Forward-confirmed_reverse_DNS wikiPageWikiLink FTP.
- Forward-confirmed_reverse_DNS wikiPageWikiLink File_Transfer_Protocol.
- Forward-confirmed_reverse_DNS wikiPageWikiLink IP_address.
- Forward-confirmed_reverse_DNS wikiPageWikiLink IRC.
- Forward-confirmed_reverse_DNS wikiPageWikiLink Internet_Draft.
- Forward-confirmed_reverse_DNS wikiPageWikiLink Internet_Relay_Chat.
- Forward-confirmed_reverse_DNS wikiPageWikiLink Internet_draft.
- Forward-confirmed_reverse_DNS wikiPageWikiLink Internet_service_provider.
- Forward-confirmed_reverse_DNS wikiPageWikiLink MX_record.
- Forward-confirmed_reverse_DNS wikiPageWikiLink Mail_spoofing.
- Forward-confirmed_reverse_DNS wikiPageWikiLink Mail_transfer_agent.
- Forward-confirmed_reverse_DNS wikiPageWikiLink Message_transfer_agent.
- Forward-confirmed_reverse_DNS wikiPageWikiLink Phishing.
- Forward-confirmed_reverse_DNS wikiPageWikiLink Sender_Policy_Framework.
- Forward-confirmed_reverse_DNS wikiPageWikiLink SpamCop.
- Forward-confirmed_reverse_DNS wikiPageWikiLink Spam_(electronic).
- Forward-confirmed_reverse_DNS wikiPageWikiLink Spamming.
- Forward-confirmed_reverse_DNS wikiPageWikiLink TCP_Wrapper.
- Forward-confirmed_reverse_DNS wikiPageWikiLink Telnet.
- Forward-confirmed_reverse_DNS wikiPageWikiLink Whitelist.
- Forward-confirmed_reverse_DNS wikiPageWikiLink Zombie_(computer_science).
- Forward-confirmed_reverse_DNS wikiPageWikiLink Zombie_computer.
- Forward-confirmed_reverse_DNS wikiPageWikiLinkText "Forward-confirmed reverse DNS".
- Forward-confirmed_reverse_DNS wikiPageWikiLinkText "forward-confirmed reverse DNS".
- Forward-confirmed_reverse_DNS hasPhotoCollection Forward-confirmed_reverse_DNS.
- Forward-confirmed_reverse_DNS wikiPageUsesTemplate Template:Fact.
- Forward-confirmed_reverse_DNS wikiPageUsesTemplate Template:Unreferenced.
- Forward-confirmed_reverse_DNS subject Category:Computer_network_security.
- Forward-confirmed_reverse_DNS subject Category:Domain_name_system.
- Forward-confirmed_reverse_DNS subject Category:Email_authentication.
- Forward-confirmed_reverse_DNS subject Category:Internet_protocols.
- Forward-confirmed_reverse_DNS subject Category:Network_protocols.
- Forward-confirmed_reverse_DNS hypernym Configuration.
- Forward-confirmed_reverse_DNS type Aircraft.
- Forward-confirmed_reverse_DNS type Article.
- Forward-confirmed_reverse_DNS type Article.
- Forward-confirmed_reverse_DNS type Protocol.
- Forward-confirmed_reverse_DNS comment "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 the Internet standards supporting many DNS-reliant protocols.".
- Forward-confirmed_reverse_DNS label "Forward-confirmed reverse DNS".
- Forward-confirmed_reverse_DNS sameAs Forward_confirmed_reverse_DNS.
- Forward-confirmed_reverse_DNS sameAs Forward-confirmed_reverse_DNS.
- Forward-confirmed_reverse_DNS sameAs Forward_confirmed_reverse_DNS.
- Forward-confirmed_reverse_DNS sameAs m.05gfsd.
- Forward-confirmed_reverse_DNS sameAs Q1439275.
- Forward-confirmed_reverse_DNS sameAs Q1439275.
- Forward-confirmed_reverse_DNS wasDerivedFrom Forward-confirmed_reverse_DNS?oldid=680380323.
- Forward-confirmed_reverse_DNS isPrimaryTopicOf Forward-confirmed_reverse_DNS.