DNS 127.0.0.1 resolve speed
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Trying to understand why when doing a lookup that the 127.0.0.1 is always slower than using the pfSense server assigned IP.
Here is a sample for addresses that are not cached. Once cached 127.0.0.1 is always 0ms and the others 1ms. Are the 1ms response not real and only a placeholder? If I add an external DNS they resolve with somewhat similar speed and the local address for pfSense are still 1ms.
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@cjbujold said in DNS 127.0.0.1 resolve speed:
Trying to understand why when doing a lookup that the 127.0.0.1 is always slower than using the pfSense server assigned IP.
I'm seeing the same thing :
Extra info :
My Resolver resolves, it isn't set up as a forwarder. Something that doesn't matter in this case.
I also presume that the host name "ford.com" wasn't present in my Resolver's local (pfSense) cache, so it had to resolve the host name.
For some reason, IPv4 was tried first : 127.0.0.1, an it took a while, 120 msec the answer came back : 19.12.97.37 (the default request was : get me a A record, or IPv4 address).
Then the same request was done over IPv6, so ::1 was used.
But this time, the answer was already known buy the resolver- and you know why ^^ - so it could answer right away to the requester without doing a full resolve lookup. So it could answer within 1 msec.
That why IPv6 seems faster.
Now you
If you want to know the true IPv6 delay, execute this :
dig -6 @::1 ford.com AAAA +trace +nodnssec[ this commands asks for the AAAA record, that's the IPv6 address, using only IPv6 as the transport protocol, and give us all de trace = details, and don't show dnssec info as it clutters the answer with useless info ]
It's a .... mess.
I presume ford.com isn't really IPv6 compatible yet. It's probably an American company, so IPv6 is still optional for them.Btw ford.com is messy. Another example and here.
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My unbound is not set up as a forwarder, and the Ford.com was not cached in unbound; therefore, I understand the time required to resolve, but I don't understand the 1ms shown. You are correct that IP6 is much faster, but unfortunately in Canada my ISP only provides IP4 service.
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@cjbujold said in DNS 127.0.0.1 resolve speed:
but I don't understand the 1ms shown
because asked it after it was cached. example
It took it 150ms to resolve it the first time, ask it again and pretty much instant.
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