DNS: Difference between revisions
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=Basics= |
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; Why do we need DNS?<ref>www.zscaler.com</ref> |
; Why do we need DNS?<ref>www.zscaler.com</ref> |
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*If DNS ALG is disabled, the session table may fill in a short time. |
*If DNS ALG is disabled, the session table may fill in a short time. |
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= DNS Headers = |
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{{UC}} |
{{UC}} |
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= Zone = |
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Source: [[http://think-like-a-computer.com/2011/06/11/dns-zones-explained/ think-like-a-computer.com]] |
Source: [[http://think-like-a-computer.com/2011/06/11/dns-zones-explained/ think-like-a-computer.com]] |
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== Zone Transfer == |
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*DNS zone transfer (Also called AXFR) is a mechanism to replicate DNS databases across a set of DNS servers. |
*DNS zone transfer (Also called AXFR) is a mechanism to replicate DNS databases across a set of DNS servers. |
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=Query Types<ref>www.mphasis.com</ref>= |
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DNS client tells DNS server whether Query is Recursive or Iterative. |
DNS client tells DNS server whether Query is Recursive or Iterative. |
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=DNS Doctoring<sup><ref>www.juniper.net</ref></sup>= |
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{{format}} |
{{format}} |
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* DNS doctoring enables an internal host on a LAN to receive the Private ip of an internal server as an answer from a DNS query when using a DNS server that is outside the LAN, such as on the internet. |
* DNS doctoring enables an internal host on a LAN to receive the Private ip of an internal server as an answer from a DNS query when using a DNS server that is outside the LAN, such as on the internet. |
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= DNS Record Types = |
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A Address record Returns a 32-bit IPv4 address, |
A Address record Returns a 32-bit IPv4 address, |
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