Bug#636292: MD5Sum mismatch is due to multiple DNS queries!

[Jonathan Nieder <jrnieder@gmail.com>]

Hi,

積丹尼 wrote:

> You can test it yourself. Turn on verbose debugging in your DNS server,
> and do apt-get update, and check the log. Voila, two queries for each one line
> in sources.list!

That particular consequence of mirrors' use of round-robin DNS is
tracked as Bug#582352.  As far as I can tell, it violates the HTTP
spec and can confuse proxies even if the clients are fixed.  I would
be willing to carry out a protocol change to make this work (doing one
DNS query and using the IP as hostname from then on), but it's not
clear anyone involved is interested, so for now I just avoid
round-robin DNS in sources.list on machines I manage.

Thanks for the reproduction recipe.