Geek asks and answers

Can a DNS server have a source IP address?

Short question:

Since DNS is anycast, is there any way for a DNS server to know the "first" source of a DNS query coming from?

Long question: I developed my own DynDNS server using PowerDNS, I want to transfer it through the web interface by users. I want the web interface to update entries for each IP-based user.

Therefore, when a DNS server receives requests, if it can determine the source IP address, it would be easy to return the records associated with that IP address.

While I tested, the DNS server can only know the "last" node IP address in the DNS chain, not the source. Is there any way?

Yours faithfully

+3
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3 answers

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23-34-45-56.www.example.com


23-34-45-56.www.example.com 1800 CNAME www-europe.example.com


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+2

Google Yahoo! (draft-vandergaast-edns-client-ip-01) DNS IETF Group, EDNS0 DNS-, IP- .

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UPDATE. RFC 7871.

+6

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+1

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