[solved] slow (first) ping response to internet host

[benitiv]

Slow (first)ping response to internet host

Dear Forums,

I have an issue with my Ethernet connection, where the first ping takes a long time until it gets through.

traditional /etc/network/interfaces static IP Address setup:

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auto lo
iface lo inet loopback

# The primary network interface
auto enp8s0
iface enp8s0 inet static
address 192.168.2.85/24
netmask 255.255.255.0
gateway 192.168.2.1

coupled with /etc/resolve.conf

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nameserver 8.8.4.4
nameserver 8.8.8.8

There are no other network programs (network-manager etc.) installed - so there is no interference / overwriting etc.

The Problem:

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ping www.google.com

takes around 5-6 seconds until the first ping goes through, but no anomalies after that.

Here it gets interesting:
In my trial and error research I suspected IP v6 to be the cause, because trying

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ping -4 www.google.com

the first response is practically instant

So I decided to deactivate IP v6 all along:
/etc/sysctl.conf:

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net.ipv6.conf.all.disable_ipv6 = 1

(followed by a sysctl -p)

However, the result is the same. Pinging without the "-4" option results in a 5-6 latency for the first ping, while using "-4" gives the desired result.

How to investigate further?
I also feel like the internet response overall should be a bit snappier that it is atm.

Please help me solving this puzzle.

[rene]

Is happiness experienced after adding options single-request-reopen to /etc/resolv.conf?

[benitiv]

Is happiness experienced after adding options single-request-reopen to /etc/resolv.conf?

Are you a magician?
It seems like that solved it!
Could you please explain or offer a link for explanation?
EDIT1: I found the option in the man pages, but please feel free to provide a more "human readable" explanation or web-source.

Thanks a lot!

EDIT2: I re-enabled ipv6 in the sysctl.conf and everything works as desired. Sorry IPv6 for suspecting you

[rene]

Very good. Don't have much to add to man resolv.conf other perhaps than making explicit that "A requests" refer to IPv4 DNS lookups and AAAA to IPv6 ones. Can not however say to be terribly sure what "some hardware" in that description refers to, i.e., what you could potentially do to not need the option; the only "hardware" that seems relevant here is the hardware that makes up Google's DNS servers, and I just tried those locally and do not experience similarly. So, shrug, I guess. At least it works

[benitiv]

Yeah the wording "some hardware" is pretty vague.
Thank's a lot for your explanation and help. Really made my new setup complete.

Have a good one.