I have Fedora 11 in a Virtual Box VM and because of a bad DNS configuration my network connection in that VM was awfully slow.
I fixed it now, but I don't understand what happened and I'm curious about what was going on.
I set a primary and a secondary DNS server. The primary server was misconfigured and most of the times did not respond. The secondary was fine.
Normally I would expect slowdowns during the first time a connection is made to a host, when the host name is resolved.
Although that was always the case, additionally my overall throughput was very slow, i.e. when I was downloading a larger file from the internet. (5-20 KB/s as opposed to 1.5 MB/s) Sometimes the transfer spiked at 100-200 KB for a few seconds, sometimes there was no transfer at all for about 20-60 seconds. That was the case with all applications, Firefox and yum I thoroughly tested.
After removing the bad DNS server everything went normal again.
Could all this come from a bad DNS server? Or is this a Fedora or Virtual Box problem?