The sender of a DNS package communicates by means of OPT resource record to the receiver that it concerns a EDNS package. A OPT record is used only with the data transfer. It is rejected after evaluation by the receiver and is not transferred in the Cache. It concerns with it a pseudo resource record.

Structure

Example

 41 4096 1 0 

Articles in category "OPT resource record"

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Related Websites

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• ISC BIND OPT resource record and SIG expiry time denial of service ...
  ISC BIND is vulnerable to multiple flaws that may allow remote attackers to cause a denial of service condition. The first flaw is due to the way a DNS ...


• Resource records reference
  Description: Option resource record. One OPT resource record can be added to the ... An OPT resource record belongs to a particular transport level message, ...


• Using Extension Mechanisms for DNS (EDNS0)
  Before a DNS server assumes that the requestor supports EDNS0, the DNS server must receive a query containing an OPT resource record. An OPT record contains ...