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I've a small VPS and I can download anything only with slow speed - only sometimes (and sometimes with normal speed). I can download from any other webpage (for example the FreeBSD's ISO files) with normal speed. I can log into another server and I can download good speed from my VPS. I tried from another machine at home (Linux Mint): very slow downloading again.

So I think the server has some settings for my home IP. Is it possible? How can I check it?

Maybe important: my laptop calls periodically (via cron) a php on my server and this php script saves the IP, a script writes it into /etc/hosts and can login to ssh only from this IP.

  • Check with tcpdump (on client and server). Possible problems include: DNS misconfiguration, broken IP(v6) configuration, Firewall issues etc. – arved Oct 19 '15 at 15:04
  • Uhm. I'm very beginner in networking. How should call tcpdump in my case? I run 'fetch ftp://...' command and run tcpdump port ftp and see its output? – uzsolt Oct 19 '15 at 17:19
  • yes. i just now saw that you are using ftp, a first test would be to download something via http. – arved Oct 20 '15 at 7:32
  • Okay. Now the http works fine. Should I run tcpdump and save its output? And when the speed will slow do it again? – uzsolt Oct 20 '15 at 7:52
  • So this looks like a Firewall problem then. Do you have a firewall running on the VPS? which ftp-client do you use? fetch(1)? – arved Oct 20 '15 at 9:32

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