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In this case, it's an HTTP request to https://www.instagram.com/, but it has happened before like this.

  • From my home (Ubuntu, i686) server it's very fast (~ 0.3 sec).
  • From my online, modern (Ubuntu, x86_64) server it's very slow (~3.5 sec).
  • From another online, older (Redhat, x86_64) server it's in between (~ 0.6 sec).

All 3 servers are in the same country. They all run Linux, though not the exact same. Results are consistent.

dig from all 3 servers gives the same ipv4 result.

Why the difference? I'm not worried about the middle (0.6 sec), but 3.5 sec is waaay to slow.

I've had a similar problem with a very slow SSH handshake, which was due to ipv6 vs ipv4. Could that be the problem? How would I find out?

Rudie
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  • To determine if IPv4 vs IPv6 connectivity is a possible factor, determine which of these hosts connect using which protocol. – Håkan Lindqvist Mar 05 '16 at 16:49
  • @HåkanLindqvist Yes, that makes sense. How? Their DNS is only set up for IPv4. Can it still be a 4 vs 6 problem? – Rudie Mar 05 '16 at 19:17
  • You need to capture traffic from the network while you are testing. Without seeing the actual network traffic, it is practically impossible to debug such a problem. – kasperd Mar 06 '16 at 14:58

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