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Michael Gilbert wrote:
> during stage 2, the installer runs an "apt-get update", then "apt-get
> install mdetect" in rapid succession. some ftp servers, such as
> ftp.debian.org, detect this as hammering and block connectivity for
> something like 2 minutes. an error message about unable to connect
> to server is presented, which is potentially disconcerting to the
> user. if not patient, he or she may give up on the install
> even though everything is working fine.
I've never heard of this happening before. I was able to reproduce the
connection throttling with this frankly abusive command (30
simulantaneous connections), but not if I just ran the commands you
mentioned in sequence. And all my command showed me is that
ftp.debian.org has a limit of 10 concurrent connections from one ip
address; if I change it to run the wgets in series instead of parallell,
they all succeed without any throttling.
for x in $(seq 1 30); do wget -O /dev/null
ftp://ftp.debian.org/debian/dists/unstable/main/binary-i386/Packages.bz2 & ;
done
Do you have some kind of exceptionally fast internet connection to this
ftp server? Or a broken ftp proxy or stateful firewall? Or do you have a
whole network behind one ip that is all connecting to it at once or some
similar exceptional circumstance?
(Note: all tests done on a machine that is 13 hops and ~60 ms away from
ftp.debian.org, average throughput is 470k/s.)
--
see shy jo
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