How many dns requests does the browser make?

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nano_e_t_42017-08-24 11:06:51

Domain Name System

nano_e_t_4, 2017-08-24 11:06:51

Hello everyone
Tell me, if anyone knows how many dns requests the browser makes to resolve one (one) domain name (let it be toster.ru)?
hosts now makes 3 requests, for a record for aaa record and mx record, but only a record is displayed in the console

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2 answer(s)

G

Griboks, 2017-08-24
@Griboks

I guess the same. But just in case, I would look at the packets through wireshark

V

Vladimir Dubrovin, 2017-08-24
@z3apa3a

If you have disabled IPv6 support, only A will be requested. If it is not disabled, then, depending on the browser and OS settings, there are 3 options:
1. A will be requested and in case of failure AAA (fallback on IPv6)
2. AAA and if A fails (fallback on IPv4)
3. A and AAA will always be requested.
PS host displays all found A, AAA and MX records. If only A outputs, then there are no others.